RV and Camper Rooftop Air Conditioner Maintenance, Troubleshooting, and Repair

Updated on January 24, 2019
Randy Godwin profile image

Randy is a lifelong lover of the outdoors and especially camping. His articles are intended to help the RVer save money and time on repairs.

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Camper Trailer and Motorhome RV AC Servicing

Since the majority of motor homes, camper trailer, or RV A/C systems are used during the hottest time of the year, it is a must to keep them in good operating order. Merely cleaning and replacing the filter is not good enough to maintain your RV AC in tip-top condition.

There are certain procedures for guaranteeing the maximum efficiency of your motorhome or camper trailer A/C unit. These steps are not as difficult to perform as you might think and will save you money and inconvenience as well.

Cleaning the condenser and evaporator annually will make a huge difference in the cooling ability of the motorhome or camper trailer RV unit. Lubricating the A/C fan motor may help extend the life and performance of the unit itself.

You will also learn a little about how these RV cooling units differ from regular household units by following the tips in this article. Be sure and check the many actual questions and answers in the comments at the bottom of this page to find a problem similar to yours if the info is not found in the main text.

Gaining Access To The RV AC Unit

Removing the shroud from a Coleman rooftop AC.
Removing the shroud from a Coleman rooftop AC. | Source

Keeping Your AC Cool

Airstream Sovereign With Coleman Mach Rooftop AC
Airstream Sovereign With Coleman Mach Rooftop AC

Brands and Models of Rooftop RV AC Units

There are several main producers of rooftop units. Coleman RV air conditioners are common on many of the best equipped motorhomes and camper trailers. The same can be said for Carrier AC units, as well as Duo Therm A/Cs. Dometic made one of the first rooftop air conditioners, as well as camper refrigerators and ice machines.

Thankfully, all of these units are similar in function and design. Some of these cooling units may even be identical under the shroud. Being familiar with household AC units will aid you greatly in servicing and repairing your air condition system, but there are a few differences as you will see.

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Troubleshooting RV AC Units

Before beginning any repair or maintenance step, it is helpful to familiarize yourself with the main components of the rooftop AC unit itself. A fan motor circulates the air from the interior of the motorhome or camper trailer through the RV AC unit where it is cooled and then returned into the RV interior.

The compressor performs the job of circulating the Freon through the condenser and evaporator coils cooling fins and the cycle is repeated as the thermostat setting deems it necessary.

Both the compressor and the fan motor use capacitors to provide a high voltage charge to get them moving and a lesser charge to keep them running.

Often, only one capacitor is used for both fan and compressor. It the capacitor goes bad, neither the fan nor the compressor will start. This part is easily replaced and is not very expensive to purchase in most cases.

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Rooftop A/C Shroud

The AC shroud showing retaining screw holes
The AC shroud showing retaining screw holes

Rooftop RV AC Shroud Removal

In order to clean or repair the RV AC unit, it is necessary to remove the shroud from atop the unit. Ordinarily this is a simple job requiring only a Phillips screwdriver or small wrench. Remove the four screws or nuts from the AC shroud and carefully slide it up off of the unit.

If the shroud is old, it may be cracked around the retaining screws or the vent holes on the sides and back. Now is the time to repair the bad spots before replacing the shroud.

A good quality epoxy cement, or other glue made for plastic repairs, should be used to reinforce the weak or broken place before replacing the shroud. It is also advisable to use wider washers on the shroud retaining screws to prevent further cracking.

If the damage seems too bad to repair, a new RV shroud may be the only option. A broken RV A/C shroud will decrease cooling efficiency plus pose a danger of flying off while the camper is in transit .

Accessing the Fan Motor and Fans

The Coleman Mach  A/C Fan Motor made by Fasco
The Coleman Mach A/C Fan Motor made by Fasco
The rooftop unit With Condenser Cover removed
The rooftop unit With Condenser Cover removed

Servicing and Repairing the RV A/C Fan Motor

With the shroud removed, it is easy to inspect the fan motor for any repairs or maintenance needed. Before doing any repairs or maintenance to the rooftop RV AC be sure to turn the electrical breaker off or unplug the motorhome or camper trailer from the electrical power source. The starting capacitor may be still charged with high voltage, so be sure not to touch it with the bare hands.

The fan should spin easily when turned by hand. Even so, it is a good idea to oil the bearings and clean the accumulated debris from both front and rear fan blades. It may be necessary to loosen the fan motor from its mountings to fully access both ends of the motor bearings.

If the RV fan motor has oil tubes to lubricate the fan, then simply put a few drops of machine oil in the tubes on either end of the motor. If the motor has sleeves instead of ball bearings, you may still dribble a small amount of oil on the sleeves where they contact the fan motor shafts. Even a small amount of oil will do wonders for these types of fan motors.

If the AC fan motor still seems to start slowly or needs a nudge to start working, it is recommended that you replace it with a new one. If the fan motor has oil tubes evident on each end of the motor, it may be rebuilt and replaced for much less than buying a new one. It all depends on the particular unit on your camper.

If either the fan motor or compressor fails to start a new starting capacitor may solve the problem. Be sure to order the right size and voltage for your rooftop unit. These capacitors may be found at your local AC parts dealer or you may find them online for greater savings. Be careful when handling these capacitors as they may still hold some electrical charge.

This Condenser Needs Cleaning

Spray cleaner and a shop-vac will do the job.
Spray cleaner and a shop-vac will do the job.

Cleaning the RV AC Condenser and Evaporator

It is recommended that you clean the condenser and evaporator fins every couple of years to maintain the efficiency of your RV air conditioner. Eventually, the cooling fins on these units will become clogged with dirt and dust.

Use a good spray or foaming cleaner, such as those shown here, to loosen the debris and then use a wet/dry shop vac to remove the loosened dirt and dust. Be sure to cover the vent leading down into the interior to keep the grime from seeping down inside.

Be careful not to bend these fine fins as they will bend easily. A special fin comb tool made just for straightening these fins may be purchased from an RV AC parts dealer or through links on this page. Once again, be careful when performing this maintenance procedure.

Bent fins inhibit the flow of air through the unit, so be sure to keep them as straight as possible using the fin comb. You may need to use a fin straightening tool to align any bent fins in the evaporator or condenser coils.

Oh No! Not A Bad Compressor

A bad capacitor is often the problem if the compressor won't start.
A bad capacitor is often the problem if the compressor won't start.

RV AC Compressor Repair or Replacement

The most costly and difficult part of an RV AC unit to replace or repair is the compressor. In many cases it is advisable to simply replace the unit instead of trying to replace the compressor. With a new unit costing about $500 to $600, spending $300 to $400 dollars for compressor replacement doesn’t make much sense.

The labor involved, plus the prohibitive cost of the compressor, can almost pay for a new RV rooftop unit. These units are very easily replaced and will have a new warranty to cover future repairs for a few years. This is usually the correct option when the compressor goes bad.

The alternative is to find a used compressor. Unless you are skilled in replacing the compressor and are able to recharge the unit with freon, this is not advisable. This step is entirely up to your skills and pocketbook. There are used RV A/C parts available online and locally in some cases.

FAQS about RV AC Repairs

Be sure and check the many questions and answers in the comment section below. Feel free to ask a question if you don't see a similar question and answer, or simply ask the question if you don't have time to peruse all of the comments.

If you've encountered a strange problem and/or solution, please leave a comment below so others may learn from it. Thanks for any advice you may have to offer too! Thanks for relating any odd problem with your camper A/C and or the solution.

Now, Enjoy Your Camping Trip

If properly maintained and serviced, your motorhome or camper trailer A/C will last for many years of camping excursions. Most maintenance can be performed by the owners if they have basic mechanical skills. Understanding how an AC unit works may just save that camping trip you have been looking forward to for so long.

Be careful and take photos of the unit before removing any parts which may cause confusion during reassembly. Be sure to protect the roof of your RV while servicing your rooftop unit. Good luck with your repairs and maintenance.

This article is accurate and true to the best of the author’s knowledge. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.

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    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      25 hours ago from Southern Georgia

      Darla, apparently there was short in the wiring at the breaker. Pleased you got it working again. :)

      Randy

    • profile image

      Darla 

      33 hours ago

      Reporting back. I was able to get it running. Wish I could tell you exactly what it was but I can’t. Lol. I simply uninstalled and then reinstalled the breakers including removing the wiring from them. Then left the breaker and thermostat off for abt 90 minutes. When I flipped the breaker and turned the thermostat to cool .... woolah! Thank you for your help.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      34 hours ago from Southern Georgia

      Darla, yes you can check the caps yourself if you have a digital multimeter. Set the meter on ohms and if the cap is good,you'll get a random number decreasing in value as long as you have the probes touching the terminals.

      A steady number or none at all indicates a bad or weak cap.

      Look on Amazon for RV AC capacitors and you'll know what tol look for.

      Randy

    • profile image

      Darla 

      35 hours ago

      Randy... I’m trying to do this without a professional. I know it may be above my expertise but there is a lot of kudos I could give myself if I can figure it out. Lol. Soooo is it possible for me to check the capacitors and of so where do I find them?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      35 hours ago from Southern Georgia

      Darla, you may have a capacitor which overloaded when you had the power surge. Have them checked first.

      Randy

    • profile image

      Darla 

      35 hours ago

      We had a self induced power surge. I’ve been able to get everything back up and running except the air and heat. When I put the thermostat to air I can hear it electronically try to run the system. I’ve checked the fuse and breaker. Any ideas? It’s on a 1995 wilderness travel trailer

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      43 hours ago from Southern Georgia

      Curtis, you may have a bad fan motor if the fan cap is good. Are you sure the thermostat is working properly? If so, the only thing left is the control board.

      Randy

    • profile image

      Curtis Adams 

      45 hours ago

      Replaced both capacitors, compressor runs, condenser fan turns freely but will not start up. Coleman rooftop ac

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 days ago from Southern Georgia

      Chuck, this is usually a thermostat or control board issue. The stat is cheapest to replace so I'd check it first, but it sounds like it's working fine as you reported. This leaves the control board as the main suspect.

      Randy

    • profile image

      Chuck 

      6 days ago

      I have RV with a Coleman Mac AC. It cools and heats fine but when I shut it off with the thermostat control it makes a humming and gurgling sound. The blower is not running. I have to turn off the CKT Brkr to stop it.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 days ago from Southern Georgia

      Thanks Don, Hope you're doing well with your RV articles too! It's that time of year. :)

      Randy

    • Don Bobbitt profile image

      Don Bobbitt 

      7 days ago from Ruskin Florida

      Great Article Randy! I enjoyed your instructions for servicing these rooftop monsters. Have a Great Day!

      DON

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      8 days ago from Southern Georgia

      Chuck, cold be a weak capacitor trying to keep charged up. Easy to replace and inexpensive if it is indeed weak. Look under the shroud to see where the noise is coming from.

      Randy

    • profile image

      chuck 

      8 days ago

      Hi my Coleman rv AC unit Cools and Heats fine. But it makes a humming noise when turned off. It will only stop if the Ckt. breaker is turned off.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      9 days ago from Southern Georgia

      Alden, first check the capacitors. A weak cap could be the issue. If not, then get back to me.

      Randy

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      10 days ago from Southern Georgia

      Dennis, check both caps as one my be weak and pulling power from the other.

      Randy

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      10 days ago from Southern Georgia

      Christopher, it should come from the 110 volt power panel breaker, but if you have a wall mount thermostat, it's powered by the 12 volt power panel fuse/breaker panel. Both should be marked in the

      panels.

      Randy

    • profile image

      Christopher C Lloyd 

      10 days ago

      Where does the 120 power for my rooftop AC come from

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      11 days ago from Southern Georgia

      Michelle, feel free to pick my brain--at least what's left of it--if I can be of service. :)

      Randy

    • profile image

      Michele austin 

      11 days ago

      Safe haven found in 70's model motorhome(divorce).......lots of things im having to remove due to water damage and plain ol'e old age.

      Your articles are well written and I feel I can eventually make this place livable.

      Just wish....I could borrow you for a couple months... and pick at your brilliant mind/skills in regards to rv/motorhome repairs.

      Thanks!

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      12 days ago from Southern Georgia

      Jim, if you haven't cleaned the coils before, then it's time to do so. Get some no-rinse spray cleaner from Ace Hardware or Amazon and give the coils a good cleaning.

      Also, you may have a bad or weak compressor capacitor causing the fuse to blow. Of course, it could be the thermostat isn't calibrated correctly.

      Take your pick and get back to me if none of these tips work for you.

      Randy

    • profile image

      Jim s 

      12 days ago

      Randy I have a 2004 coachman aroura gold the top front ac works great air wise but recently it does shut off till it is at least 10 plus degrees colder the the thermostat is set for. Currently set at 85 shuts off at 74. And sometimes blows the fuse. Never did that before.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 weeks ago from Southern Georgia

      Savannah, apparently the fan is out of balance for some reason or the compressor shocks may be worn out. You'll have to remove the shroud to be sure.

      Randy

    • profile image

      Savannah 

      2 weeks ago

      Hi Randy, we have a 2008 montana and the ac has worked completely fine until last night..while it was running fine during the day later in the evening we had really bad vibrations coming from the ac shaking our fifthwheel. We had to shut the thermostat off immediately.. any clue of where a good start would be to solve this issue? Thank you in advance! Please email me what you think it could be. Savannah.torres94@ymail.com

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 weeks ago from Southern Georgia

      Tyler, if the roof gasket s okay, then usually water leaking down through the AC means the coils are very dirty. This can also affect the compressor by making it overheat.

      Get a few cans of spray no-rinse coil cleaner and clean the coils as directed on the can. Even though you may clean the filter regularly, overtime dust gets through the filter and clogs the coil.

      The excess moisture can't be dispersed into the air and it drips down into the camperand can affect the compressor.

      After you clean the coils thoroughly, if the compressor doesn't run, then you may have a bad capacitor.

      Randy

    • profile image

      Tyler Morton 

      2 weeks ago

      Hey Randy I have a 95 rockwood camper the a/c was leaking water in the camper then it just quit blowing cold air the fan will come on but no cold air any ideas

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 weeks ago from Southern Georgia

      James, if the compressor is running, then this points to a low Freon charge or a restriction in the system.

      Randy

    • profile image

      James 

      2 weeks ago

      Hi Randy, I have a Dometic ac unit almost 3 years old that’s not blowing cold. Same temperature going in same coming out. Filter is clean condenser is clean compressor is running but it’s very hot. Any suggestions? Thanks

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 weeks ago from Southern Georgia

      Marvin. newer units do nt have a drain as the fan disperses the excess moisture into the air. If you have a problem with water dripping down inside the unit, it means the coils are very dirty.

      Buy spray no-rise coil cleaner from Amazon or ACE Hardware and clean the coils as per the instructions.

      Randy

    • profile image

      Marvin Furmanek 

      2 weeks ago

      Where is the drain located on a roof mount

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 weeks ago from Southern Georgia

      Bobby, only in the breaker panel.

      Randy

    • profile image

      Bobby Otts 

      3 weeks ago

      Does the Coleman Mach have a fuse

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 weeks ago from Southern Georgia

      Jenna, have the capacitors checked or replaced first. An easy task and usually about $25 to replace one.

      Randy

    • profile image

      Jenna Knight 

      3 weeks ago

      Our 08 keystone dometic rooftop duo therm started making a bunch of clicking noises after using it a while and would intermittently throw the breaker. But now it throws the breaker on the generator. Any ideas?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 weeks ago from Southern Georgia

      Rachel, the coils icing up are usually due to running the unit with the thermostat too high, but if the other unit isn't freezing up--I assume they're on the same stat--the unit may be low on Freon. A low charge will cause the unit to get really cold right before it loses its charge.

      Hope this helps,

      Randy

    • profile image

      Rachel DeStefanis 

      3 weeks ago

      Dometic brisk air 2 unit on 2018 Gulfstream innsbruck stopping blowing cold. Fan comes on, i feel some air coming out, but its not cold. Husband went up on the roof & noticed the condenser coils and lines were starting to freeze up when unit was turned on. Any ideas? Unit is under warranty but having trouble finding a mobile service technician to come out.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 weeks ago from Southern Georgia

      Warren, this issue may be due to a weak capacitor. Any local AC or electric motor repair shop can check and replace it for you. If this isn't the problem, then let me know.

      Randy

    • profile image

      WarrenFReid 

      3 weeks ago

      Randy, I have a Copper Canyon with a Dometic ac unit. It intermittently throws the breaker. But when it does, it usually has been running fine for a while. There is a hum, pause, hum ...then the breaker is thrown. But it doesn't happen all the time and I don't seem to be able to make a common occurrence. Any ideas?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 weeks ago from Southern Georgia

      John, probably a weak capacitor. About $25 buck and easy to change out.

      Randy

    • profile image

      hartjohn127 

      3 weeks ago

      Hey Randy I could really use some advice. I have a 2002 Monaco Diplomat with dual units and my front unit looks newer then rear, the problem with it is, it blows cold for about 3-5 minutes then it just stops and makes a humming noise as if it were frozen even with constant fan mode the fan shuts off as well, but I can just turn on fan mode for days if I want and fan will stay on just fine.... Its hot and we are living in unit so any help would be awesome sir! Thanks and feel free to email me... Hartjohn127@gmail.com

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Steven, sent you an email. :)

      Randy

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      Steven Slay 

      4 weeks ago

      hey Randy I have a 2006 surveyor by Forest River air was working fine then when I cut it off the exhaust fan outside started blowing and making a sound and then I heard a clicking noise coming from the outside panel it would click click click click click click and then stop and then it would click click click click click and then stop I could see a spark when it was clicking but the AC will not turn on is there any way you can help me

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Sue, have you tried contacting the main Dometic/Duotherm online site? There should be someone you can contact there.

      Randy

    • profile image

      Sue Stone 

      4 weeks ago

      I have a 2005 Cougar with Dometic /Duo therm roof top ac. Had a lightening hit a few days back. Replaced converter, ac capacitors and have just about gone totally bonkers trying to find part number 3107541.009 the number on the metal box the control board is in. How do I find the number of the control board?

      Thanks, Sue

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      Sandy, this may be due to a bad capacitor. Around 25 bucks and easy to replace.

      Randy

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      Sandy peters 

      5 weeks ago

      Our 2001 citation motorhome rooftop air breaker keeps kicking off. Out of the blue. No problems b 4. Still Cold when you flip breaker back on but it kicks off after couple minutes. Meter spikes over the 20 amp breaker capacity.help!!!

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      Thank you Lauren, I do my best to help those new to RVing and will try to help you with your AC if needed.

      Thanks for reading and commenting, Lauren! :)

      Randy

    • profile image

      LaurenJn83 

      5 weeks ago

      We just recently bought a used fifth wheel to live in while we build with very little camper knowledge! Anyway our second Rooftop AC unit isn’t working right and I stumbled across your site for advice. I don’t have a question yet but reading through these Q&A’s I just want to say you’re a really cool guy Randy to try to give out so much advice to help others!

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      Heather, tighten them securely enough the fan is not shaking around, but not enough to completely compress the rubber grommets.

      Randy

    • profile image

      Heather 

      5 weeks ago

      I bought a motor service kit (rubber washers, ferrules, nuts) to replace the worn ones on my dometic duo therm fan motor. But I don't know how tight to make them? A couple of the old ones didn't seem compresed, but one was completely destroyed. Not sure how far to tighten the nuts against the rubber inserts.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      Dan, your coils need cleaning. When they get dirty the excess moisture tends to drain down inside the camper.

      Go to Amazon or your local ACE Hardware store and get some no-rinse spray coil cleaner and you should be fine.

      Randy

    • profile image

      Dan park email danpark4743 @ g mail .com 

      6 weeks ago

      My unit will start to drip water in side went up top and looked to see what was happening was no water in drip pan but had water in meal base blower was blown it inside coil dose not look to be dirty the drain ports are not stopped up any ideal what’s going on has me bumfuzal

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 weeks ago from Southern Georgia

      83, sorry I can't help you with this issue. Have you tried looking at the brand online? Check your local electric motor repair as they may be able to help or rebuild your present motor.

      Randy

    • profile image

      83ToyotaDolphin 

      7 weeks ago

      Any advice where to find a replacement fan motor (or someone who can fix) for my 83 Toyota Dolphin? Grainger doesn’t have it, no one seems to know the replacement, and I can’t find anyone willing to work on it, besides camping world for like a million bucks...

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 weeks ago from Southern Georgia

      Randy, you'll have to contact the maker for these items or you can use a universal kit which comes with a shaft which can be cut to length and a universal mounting bracket.

      If there's an electric motor repair shop close by they may be able to fix you up. I do believe Amazon sells a universal kit but not sure.

      Randy

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      Randy 

      7 weeks ago

      Trying to find a fan motor, shaft and blade for a Duo-Therm Quick Cool RV unit.

    • profile image

      Trent 

      2 months ago

      Ok I will try it ... appreciate it randy

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      Trent. turn your meter to ohms and check for a random number decreasing in value as long as the probes are connected to the terminals. If you get a steady number, or a 0, then the cap is bad.

      Randy

    • profile image

      Trent 

      2 months ago

      There is a separate cap for the compressor but I am not showing any voltage on it or the compressor.... if the cap is bad is that normal?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      Trent, if you only have one capacitor, then it may be too weak to start/run both the fan and compressor. Be sure there's not a cap for the compressor separate from the fan motor.

      Randy

    • profile image

      Trent smith 

      2 months ago

      Hey randy,

      I have a 2001 Jayco 5th wheel and the fan for the ac comes on but the compressor does not. I am not getting any voltage tk the compressor... the only voltage I get is to the fan cap... shouldn’t I have voltage to the compressor even if the compressor cap is bad?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      No James, the imbalance will ruin the fan motor. You'll have to order a new fan.

      Randy

    • profile image

      James 

      2 months ago

      My cover came off my RV because of high winds and btoke most of my blades off the fan and caused a bad vibration can I still run the a,c un

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      Bill, hope a good coil cleaning will set you right.

      Randy

    • profile image

      Bill Handsaker 

      2 months ago

      Randy, Thanks for confirming my suspicions and yep, flipped the power back on and the AC/heat pump fired up. Before I powered up, I observed the condenser coils/fins via ladder and binoculars and the coils seemed clean however, as we know, it's what's inside that matters so I'll pull the cover off when the winds die and do some maintenance cleaning regardless of debris presence. Thanks again.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      Bill, that's entirely possible, especially if the unit hasn't been cleaned recently. When the coils get clogged it allows the compressor to overheat and will shut down as you described.

      Try cleaning the coils with a good no-rinse coil cleaner if the unit comes back on when it cools down. Otherwise,a capacitor could be bad.

      Randy

    • profile image

      Bill Handsaker 

      2 months ago

      MH rooftop a/c was running fine but quit. We're in the middle of a rather severe high wind/blowing dust storm in Roswell, NM and I'm wondering if (after 4-5 hrs of operating the a/c) the high winds and related dust/dirt may have plugged the condenser thus causing shutdown? Any help would be appreciated ASAP... Thanks

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      Nicollette, contact me when you remove the shroud. Get someone to turn the unit on while you see if you can spot the problem. I live in south Ga.

      Randy

    • profile image

      Nicollette 

      2 months ago

      Hey Randy,

      Went to use my rooftop unit in my '96 gooseneck horse trailer last weekend. It made a very loud knocking noise and would not blow cold air on low or high cool or fan. The noise was not as loud when I turned it to heat and did more of a normal humming but the longer I messed with it, a burning plastic smell began so I quit. I haven't taken the shroud off yet. Hoping this will be an easy fix. We are in GA and last weekend it was cool enough to open the windows but it will get hot hot hot soon enough.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      Debi, this sounds like either a thermostat or control board issue. Check or change the stat first.

      Randy

    • profile image

      Debi 

      2 months ago

      My ac unit came on out of the blue. Switch is on off position. I hit the breaker to turn it off. After waiting sone time. I hit the breaker to in. Unit was running, not the blower, so i turned switch to on, lowered temp control and blower came on. Its blowing cold air like normal. When inside temp is reached, entire system shuts down as nirmal the blower first. Then within 3 or 4 min, system came on again, no blower. I had to turn temp down more to get blower started. Any ideas

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      Irwin, this is either a thermostat, capacitor, or control board issue. Can you tell me more about the problem?

      Randy

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 months ago from Southern Georgia

      Jon, it may be out of balance because of a bent blade or even a mud dauber nest attached inside the squirrel cage fan. You'd be surprised how often the latter is the case.

      Randy

    • profile image

      Jon 

      2 months ago

      My Coachmen Freedom Express AC fan seems to be excessively loud. Can it be quieted?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 months ago from Southern Georgia

      Daniella, check or replace the capacitors. Around $20 for each if you have two. You may only have one to start the fan and compressor if it's an older model.

      Randy

    • profile image

      Daniella 

      3 months ago

      I have a 99 avion my ac started squeaking and now my fan and ac will not ingage but it acts like it wants to come on qhat could be the problem

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 months ago from Southern Georgia

      Jeff, yes if you don't want to check it first.

      Randy

    • profile image

      Jeff 

      3 months ago

      Just want to make sure that to discharge a capacitor you use a screw driver and ground capacitor to frame of AC before handling, is this correct?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 months ago from Southern Georgia

      Dera, if you're sure the converter is working properly, then this may be a problem with the control board if one controls both ACs.

      Randy

    • profile image

      Dera Smith 

      3 months ago

      Randy, my husband and I were camping last week at Daytona beach. Both AC units on our 2015 HR Ambassador we’re working fine until we lost power to our RV. We had to have an on-site RV repair the Inverter and replace 4 batteries. When power was restored, neither AC unit would come on. The thermostat works but the units will not. Breaker is on and the RV tech tested through the fuse box inside. Is there something we are missing? Can you think of anything we can check? He did remove the thermostat, unplugged it and plugged it back in. Nothing. He strapped something on top of one of the AC units to make it work until we could get back home.

    • profile image

      Steven C Bostwick 

      3 months ago

      Thanks Randy

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 months ago from Southern Georgia

      Steven, yes this does indeed sound like a bad compressor cap. You can check it with a multimeter set on ohms. You should get a random number decreasing in value if the cap is good. Hope this helps!

      Randy

    • profile image

      Steven C Bostwick 

      3 months ago

      Hello Randy, I have a Brisk 2 15000btu.It was installed 6/15. The problem i have is when i start the a/c the compressor trips out after about 3 seconds. but the fan continues to run. Bad compressor cap? thanks in advance

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 months ago from Southern Georgia

      Tim, how does it act on manual? If it works okay, and doesn't freeze up with the thermostat turned up, then you may have a stat problem. Otherwise, a low Freon charge could also cause this.

      Randy

    • profile image

      Tim Bates 

      3 months ago

      My camper ac will not shut off when i turn fan auto. I think the fan will cut off but the compressor will stay on and it makes my ac unit freeze up. Any idea why it will not all shut off when i put the unit on auto?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 months ago from Southern Georgia

      That's a tough one, Bruce. If the unit still has some warranty on it, Id wait and see if it happens again. Sounds like a loose connection somewhere and may be because I've had capacitor leads be loose enough to cause this on and off type performance.

      Randy

    • profile image

      Bruce 

      3 months ago

      My 15000 BTU heat pump roof air quit heating and cooling. Fan ran but compressor would not come on in any setting of thermostat. I took back to dealer for under 2 year warranty. It did not work at dealership and did no diagnostics other than temp check which failed. Told me to come back in week they will put new Coleman unit in. I said ok. After returning to RV park I tried it again and has worked perfectly for a week. In the meantime the dealership has called and wants to do more diagnostics on the unit because Coleman won't send out new unit without doing them. It is about a 2 hour trip one way and I'm afraid of the dealership ability to find anything wrong if it's working now. What should I do? Thanks.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 months ago from Southern Georgia

      Odelie, if the AC is working properly, then more than likely the ductwork has collapsed and not allowing the air to travel through the vents.

      You might try using a long stick of some sort to spread open the ducts trough the vents. You amy have to try several until you find the one obstructing the airflow.

      Randy

    • profile image

      Odelie 

      4 months ago

      Ac works, no air from the ducts. How do we find the problem? How do we fix it?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 months ago from Southern Georgia

      Capt. Bob, this problem can be caused by either the thermostat of the control board in the unit. Check the stat first.

      Randy

    • profile image

      Capt. Bob 

      5 months ago

      Got a 15k ac on roof of 2018 Tiffin C class.After two months on rode, ac started new problem.With thermostat in auto cool the unit did not cycle to completely off as usual when target temp was achieved.Fan continued to run.Increasing target temp had no effect as well as selecting off position on thermostat.Finally stopped unit with 25A c/b.Any ideas?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 months ago from Southern Georgia

      Pat, first check to see if there's a mud dauber nest either stuck to the bladed fan, or there may be one inside of the squirrel cage fan. If either of these fans have a nest attached it will cause the fans on the motor shaft to be unbalanced and cause this problem.

      If this isn't the case--it's a common problem--then check the shock absorbers.

      Randy

    • profile image

      Pat Thomas 

      6 months ago

      I've got a roof A/C on a 35' 2013 Forest River Salem Hemisphere. When I turn the A/C on the sound it puts out is deafening. It's a thump, thump, thump. Would it be the shock absorbers are shot? If not what would you suggest?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 months ago from Southern Georgia

      Jordan, yes it could be a bad capacitor. You can take the cap to any electric motor or AC repair shop to have it checked or you can do it yourself with a multimeter set on ohms.

      If you get a random number which decreases in value the cap is good. If the number is zero or another number and stays the same, the cap is bad.

      Randy

    • profile image

      Jordan 

      7 months ago

      Hi Randy

      I'm from Australia I have a Coleman Mach 9000 series on my caravan I had it checked yesterday and was told the compressor was seized when you turn it on you the compressor try to kick in but then stop he only just listened to what was happening and didn't check anything could it possibly be a compositor that is no good if you can advise on it that would be appreciated I looked online a you seem to be the guru of airconditioners

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 months ago from Southern Georgia

      Carol, this may be a thermostat issue since the light comes on while the furnace is in use. Without knowing what the light indicates, I can't advise you as what to do other than change or check the stat.

      Randy

    • profile image

      Carol weber 

      7 months ago

      Randy my 2004 Bounder has to Rooftop AC. For about a week when I turn on my front AC after a period of time a red light comes on back by the thermostat. So I turn the AC off and sometimes it would be fine and cool with no problem but then other times that red light would come back on and it would stop cooling so I turn it off. This morning it got cold so I turn the furnace on and after the furnace ran for a little while that red light came back on again. It's that Red Shed light for when you're running two air conditioners which I never run both at the same time ever. As long as it was the red light coming on when I was running the air conditioner I wasn't worried but now that it's coming on when I'm running the furnace it concerns me

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 months ago from Southern Georgia

      Kathleen, first of all I'd have the compressor capacitor checked and/or replaced. Around $25 to replace and an easy chore.

      Randy

    • profile image

      Kathleen 

      7 months ago

      I have a domectic central ac unit in my fifth wheel the fan inside works great when I turn it on it clicks but the compressor is not kicking on does this particular ac need a freeon boost or does it even run on freeon? my rV is 2015 or could this be just a cleaning issue rooftop? As I live in southern TX ac is definitely a must as my 2nd ac does not quite do the job as in bedroom what do I keep to look for on roof top that might help? Before calling professional help

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 months ago from Southern Georgia

      Garret, yes the caps are the first thing to check. You may get lucky! :)

      Randy

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