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 

      5 hours ago from Southern Georgia

      Scott, can you clarity your problem?

      Randy

    • profile image

      Scott bramhall 

      8 hours ago

      Air will shut off braker. 2 min will on

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      32 hours ago from Southern Georgia

      Misty, if the coils are clean, then you may have a low Freon charge.

      Randy

    • profile image

      Misty 

      33 hours ago

      My AC blows good an is cool but not as cold as I think it should be.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 days ago from Southern Georgia

      Dave, it's either a thermostat or control board issue. Check the stat first before replacing the control board.

      Randy

    • profile image

      Dave 

      2 days ago

      My roof top a/c unit comes on when I plug into shore power even though the thermostat is turned off. Why is this happening

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 days ago from Southern Georgia

      Jeremy, may be a weak capacitor causing this to happen. Easy to replace and cheap in most cases.

      Randy

    • profile image

      Jeremy 

      6 days ago

      I have an older carrier roof top model.i turn it on it runs good and cold for a while then it bogs down then quits any help would be appreciated

    • profile image

      Daniel 

      7 days ago

      Thanks randy! Will give it a try this weekend.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      9 days ago from Southern Georgia

      Daniel, this is usually a sign of dirty coils. When they get clogged--especially the one behind the filter--the fan cannot disperse the moisture into the air as it normally does and it leaks down into the camper.

      Get a couple of cans of no-rinse spray coil cleaner from Lowe's, Home Depot, ACE Hardware, or Amazon if you prefer. Follow the directions and you should be fine.

      Randy

    • profile image

      Daniel 

      9 days ago

      I have a park model camper at the beach in NC and just noticed that the AC unit is leaking into the camper and actually all around the filter. Only happens when the AC unit is running, but leaked so much it created a little bit of a bulge on the ceiling right behind the unit. Could it be freezing up? Any thoughts?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      10 days ago from Southern Georgia

      Janie, probably a bad compressor capacitor. About $25 or so and easy to replace. Any local AC or electric motor service can check it for you and furnish a replacement if necessary.

      Randy

    • profile image

      Janie 

      10 days ago

      Our camper is set up permanently. Son got up today and fan is running but not cooling. Please help, we don’t know anything about these air conditioners, also it is one on top

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      11 days ago from Southern Georgia

      Larry, yes you should be able to swap them out as the holes are the same size.

      Randy

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      Larry Cordell 

      12 days ago

      I have a 2015 Prowler with a Dometic ac unit (second one that I have put on the camper) they're not cooling the camper down. I have a 2007 Keystone with a Dometic duo therm that cools down really good could this one be put on the Prowler instead of the Dometic that is there?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      12 days ago from Southern Georgia

      Natasha, if the new cap doesn't help, then you may need to clean the coils thoroughly. Dirty coils can inhibit an AC's performance.

      Randy

    • profile image

      Natasha L Berry 

      12 days ago

      Keystone Loredo "04" our AC will run and keep it cool if the temp outside is 90 degrees and below but it will be only somewhat cool while my daughters camper beside us is freezing. If the temp outside gets higher than 90 (and its been 95-100+ degrees all summer thus far) The AC seems to either not work or pump warm air into the trailer. My husband is going to camping world today to purchase a capacitor and I wanted to know if this sounds like it maybe the capacitor failing? At the same time, I have noticed after talking with other campers that our electric bill is much much higher than other people, so I could conclude that it is using a lot of amps as stated in conversation below and I'm not sure if that's because it's not working at its best so we have to leave it on all day? Thanks, Natasha

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      13 days ago from Southern Georgia

      Brent, the compressor may be going bad if it's drawing more amperage than listed on the unit. The only way to check this is by borrowing or renting a clamp on amp meter and check for yourself.

      Randy

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      13 days ago from Southern Georgia

      Kris, more than likely a bad capacitor. About $25 and easy to replace.

      Randy

    • profile image

      Brent 

      13 days ago

      2002 Duo Therm Quick Cool model 15K ducted RV rooftop air unit recently started some noticeable vibration on low, very much vibration on high. Still cools, but other day vibration has lessened a little on low, but now RV cord getting WAY too hot when a/c ran maybe 45 minutes.... drawing too much amperage apparently. No nests or debris seen inside shroud or unit. Thoughts?

    • profile image

      Kris 

      13 days ago

      Just got a 2007 Roo 23SS. The a/c worked fine and cooled down great. Today we turn it on and nothing happens. We can hear it click when turning on the thermostat but nothing runs. Suggestions. We are new to this as we previously had a pop up with no air. Thanks.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      13 days ago from Southern Georgia

      Terry, change out the compressor capacitor first. Easy to replace and around $25 or so.

      Randy

    • profile image

      Terry R Boone 

      13 days ago

      Camper Ac started blowing hot air. Now will not run. Set on cool fan will run but compressor will not kick in. Suggestions?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      2 weeks ago from Southern Georgia

      Mark, what do you mean by end play? Distance from the coil?

      Randy

    • profile image

      Mark 

      2 weeks ago

      How much end play should you have on the fan motor shaft?

    • profile image

      NanaSueYobo 

      2 weeks ago

      Thank you Randy ... Will check it out there

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 weeks ago from Southern Georgia

      Nana, I don't have an error chart for your AC. You'll need to go to the maker and download the owner's manual if you don't have one. Sorry!

      Randy

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      NanaSueYobo 

      3 weeks ago

      What is an E4 reading on my a/c panel ? A/C is off and I dont knoow what this means

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      3 weeks ago from Southern Georgia

      Matt, unless the fan motor is bad a new cap will usually solve this problem.

      Randy

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      Matt klaver 

      3 weeks ago

      My cometic ac units blower won’t start unless you spin the squirrel cage. I’ve already changed the capacitor and added a booster but no luck. The camper is only 2 years old. Unfortunately it’s out of warranty.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Nicole, there are several things which may be the problem. I suggest you clean the coils and check the capacitors first.

      Randy

    • profile image

      Nicole 

      4 weeks ago

      1993 Starcraft leisure Star 30ck

      Hello i have this trailer listed above but my trailer ac on the roof top isnt working well he does get cold inside but only a little what might be the cause

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Thanks Patrick, I usually ask if the coils are clean as well when a reader says the compressor is overheating and switching off. I am a bot leery of telling a reader to use water to cool off the compressor though.

      Randy

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      Patrick Hollingshead 

      4 weeks ago

      The dude who wrote this article seems very knowledgeable. Im an a/c tech with universal epa certification and i am NATE certified and everything he wrote seems spot on. One thing i noticed that he didnt address, in the summer when used almost 20 hours a day sometimes, the compressors can get over heated. The compressors have a temperature safety switch located in them on the tops of them, if you notice your a/c turn on but quieter and everything else checks out if u LIGHTLY touch the top of the compressor and its blazing hot, this switch could be keeping it from turning on. If this is the case keep the breaker turned off and let it cool. If just left to cool off by simply keeping it off "meaning breaker off, very important" it will take a very long time. To speed up the process, with the breaker off and shroud off use a water hose to cool it by continuously keep a stream of water flowing on top of the compressor untill it is completely cool to the touch all over it. Don't just cool off untill it kicks back on, its better to let it completely cool down this will prevent damage to it.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Joshua, the type Freon used should be listed on the unit somewhere. If not, look online for the maker of the unit and there should be info about the Freon type.

      Randy

    • profile image

      Joshua 

      4 weeks ago

      I have a 1998 28 ft 5th wheel trailer. What type of freon is in theroof top ac?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Robert, probably a bad capacitor. Around $25 or so and easy to change out.

      Randy

    • profile image

      Robert OBrien 

      4 weeks ago

      Sir, i have a 2018 Coachmen freedom express. AC has been working great. Today it seemed much quieter than normal and is not blowing cold air the way it has been. It is set correctly. Not sure where to look.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Russell, unless you have a vacuum pump and the proper gauges it'd be better to let a professional do it. You'll need to find the source of the leak as well.

      Randy

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      Russell C Elrod 

      4 weeks ago

      ya im thinking low freon cause after the freezup that started all this i cleaned them pretty good with a shop vac with a brush head on it and didn't bend any fins and its pulling air through and its not icing up what would i need to add freon to a system like these its a duo therm model 59516.331 1500 nom btu roof ac and the inside coils riight now at 6:30 am set at 70 don't even feel cold to the touch ina arm even so it must be the freon

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Russell, if you haven't cleaned the inside coil behind the filter, try using so no-rinse spray coil cleaner on it. If this coil is very dirty it could make the coil freeze up. Otherwise, this issue may be a low Freon charge.

      Randy

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Art, more than likely it's the thermostat or the control board.

      Randy

    • profile image

      Russell C Elrod 

      4 weeks ago

      Hi Randy i have a duo therm 13000 btu rooftop ac and about a month ago i had turned the ac downtoo far and the coil froze up bad i then turned off the ac but left the fan on and it started leaking water into the rv from the coil through the air intake where the filter is in the roof which the control board box is right there im not sure if it got wet inside the box i turned the breakers off for the ac and waited till it stopped dripping water got a hair dryer and opened the access pannel for the control board and it did not seem to have gotten any water in iso i turned the breakers back on and turned the unit on and it seemed to run fine but when i turned the thermasat heat /off/cool to off the fans stopped but you could feel the compressor was still running and would no go off unless i turned the breakers off so i replaced the thermastat with a new one and that seemed to fix the problem but i used to have hi/low fan now only high seems to work when i switch it to low fan it stops blowing are now here is the real problem now at night the ac will freeze you out if you set it low but i live in Fresno Ca and its getting up 90-107 but when it starts getting hot it stops cooling exceptevery now and then you hear the compressor kick on the lights dim for a sec which its always done but the air blowing out is not really cool then seems to just get hot but like i said at night iand mornings t will still cool very good will get you shivering if you turn it down so what can this be causing it to stop blowing cool air once the temp gets up over 85 + it becomes an oven in here i have congestive heart failure but did clime up and try to clean the outside coils and it didnt really help but it was working fine before this it would keep it real cool in here when 110 outside so im stumped could it be heating up with heart problems i have not been up to clean the roof off like i would every 6 months and now its all covered with dust bad everything brown not white like i used to keep it but we had alot of shade from trees but for it to be working fine till it froze up now does this since but changing the thermostat stopped the compressor from not shutting off i and the fact it will freeze us out at night and morning please help i can check the control board but will pay someone to do anything on the roof and let me say this everyone please get your flu shots that is what caused my heart problems i got that flu 2 years ago that killed so many and it almost killed me im 51 now with only 30% use of my heart now thanks

    • profile image

      Art martinez 

      4 weeks ago

      I have a 1985 starcraft the ac unit blows cool air,not cold air n the termostat does not change setting the ac unit runs all the time

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      4 weeks ago from Southern Georgia

      Beth, I don't have a schematic. Look online for the maker of your AC. You'll need the model and serial number to find the wiring diagram.

      Randy

    • profile image

      Beth 

      4 weeks ago

      My wires got pulled out of my ac and I need to know how to put the wires back in

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      Troy, probably a weak capacitor. Easy to replace and around $25 or so.

      Randy

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      Troy Ridley 

      5 weeks ago

      When i turn the air on the motor runs for a bit then the compressor kicks in like it should. Only runs for about 30 seconds the the compressor kicks out for about a minute or 2. Then kicks back in. Dose this repetitive. Sometimes after about 2 hours it starts working properly. Sometimes it doesn't. Any ideas.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      Jeffrey, yes the ports are notorious for leaking. I don't know what capacity the system requires but it can be recharged.

      Randy

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      Jeffrey Gregory 

      5 weeks ago

      I have a Coleman Mach series rooftop unit that has lost cooling efficiency (slowly). It has a service port installed so my guess is that it has or had a slow leak. About how many pounds of refrigerant does one of these units take. I will also make sure the condensor and evap fins are clean.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      Eric, this is usually a control board or thermostat issue. Check the stat first before replacing the control board.

      Randy

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      Eric 

      5 weeks ago

      My ac blows cold but fan only runs on full speed

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      Ron, if the coils are clean, then you may have a bad capacitor. Dirty coils can prevent the compressor from cooling properly. Using some no-rinse spray coil cleaner will stop this issue. Otherwise check and/or replace the capacitors.

      Randy

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      Ron Thompson 

      5 weeks ago

      I bought 2012 Milan eclipse 24lsbh . Dometic 13500btu started popping breaker at about 90+ outside upgraded breaker to 20amp. Same problem. Now have new 15000 dometic. Worked great until outside temps reached 100. I m now going down bad connection route. Breakers is good have no.12 wires. Not familiar w rv. Any ideas?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      Sheila, have the capacitors checked first. Any AC or electric motor repair can test and replace them for you.

      Randy

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      Can-RV, sounds like a bad fan motor. You may be able to oil it up and get by for awhile, but a new motor will eventually be needed.

      Randy

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      Sheila 

      5 weeks ago

      We have a 2018 Wildwood by Forest River, and the ac comes on and works fine for a couple hours, then it starts cutting off and right back on.. Can you help me??

    • profile image

      Can-Rv 

      5 weeks ago

      Great guide. Thanks for putting this together. I have a dometic 13500 btu rv air conditioner.

      The squirrel cage fan somewhat spins manually by hand. It maybe spins for a full turn or two and thenStops. When running, R”it runs for about an hour then starts to make squeaking noises and eventually slows down and stops completely. With or without air condition compressor running. This happens when running on “hi” fan speed. Motor has no grease ports but I put some 3 in one 1/4hp motor lubricant on both sides of the motor shaft.

      Not sure if it is a capacitor issue or a bad motor that is overheating due to friction on the shaft. I have to test the capacitor still.

      Thoughts?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      Jason, I don't have a wiring schematic for your unit. Are you sure this isn't a control board issue?

      Randy

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      Jason Lunsford 

      5 weeks ago

      After wiring 4 wire thermo replacing my 3 wire my fan will not switch from high (no auto no low) and will only turn off if i unplug from the control box at base of ac unit. Have tried every combanation or wires to make work and now over 300 in rv repairs and still same issue. 2015 kingsport 26bhg also somehow lost the 12 volt supply to ac and havent found where 2 white wires run to to check and no luck finding whole rv wiring diagram

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      John, more than likely a bad compressor capacitor. Easy to change and about $2 busk or so. Any local AC or electric motor repair service can test the cap and give you a replacement.

      Randy

    • profile image

      John 

      5 weeks ago

      Today when my ac turned on the lights dimed down and it did'nt start. I switched the switch on the thermostat to fan and the fan runs. When i switct it to cool i can hear a hum but the ac unit won't start.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      5 weeks ago from Southern Georgia

      Jason, as long as it's non-corrosive.

      Randy

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      Kristin, your extension cord isn't of the size to provide the amps and voltage needed. Get at least a 15 amp cord.

      Randy

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      Kristin 

      6 weeks ago

      We have the rv plugged into the house and ac is really dragging but not flipping a breaker. We did have to use an extension cord. What could be wrong?

    • profile image

      Tiffanie 

      6 weeks ago

      Thanks Randy, I will look for them when I get home.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      Tiffanie, yes there should be two breaker/fuse panels. One for the 12 volt DC system and another for the 120 volt ac system.

      Yes running the AC ona low amperage breaker or using too small an extention cord will cause the breaker to kick.

      Randy

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      Tiffanie 

      6 weeks ago

      Do all campers have a fuse box? I looked but did not see one. Going to have to dig a little deeper when I get home from work. My friend told me that I should not have ran the a/c unit because I did not have the right amp plug in. Would this cause the fuse to blow or the a/c unit to quit working all together?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      Tiffanie, may be a bad capacitor. Cheap and easy to replace in most cases. Any AC or electric motor repair service can test and replace it for you.

      Randy

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      Tiffanie 

      6 weeks ago

      I just bought a 2004 Sunline. I turned the a/c unit on, went in the house, came back out and it was not running. I thought maybe I blew a fuse in the house but everything else in the camper has power. I tried turning the dial to just the fan and still nothing.

      Any ideas?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      Anita, probably a capacitor going bad. About $25 or so and easy to replace.

      Randy

    • profile image

      Anita 

      6 weeks ago

      It just started today , but our ac in our camper chaparral fifth wheel started putting out a burnt like rubber smell? Any ideas on what to do? Or what it is causing this?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      Ben, this is either a thermostat issue or a bad control board. Check the stat before replacing the control board.

      Randy

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      Ben G 

      6 weeks ago

      Ac question, is it normal for the ac blower motor to go from low to high when in auto mode continuously? Is auto mode not the same as it is in a home unit. Compressor continues to run when fan is switching speeds.

      Also if it is on low or high after a bit of running it will cut off and I need to cut t-stat off then back on for it to run again.

      Is either of these a problem or has someone else had the same problem and found a fix for it? Dometic brand unit.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      PJ. this due either to thermostat or control board problem. Check the stat first before replacing the control board.

      Randy

    • profile image

      PJ 

      6 weeks ago

      My air runs in off position why??

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      Rodney, more than likely the coils are dirty if excess water is dripping from the roof. Get some no-rinse spray coil cleaner from Lowe's or Home Depot and give them a good cleaning.

      Also, the ducting could be collapsed causing the airflow to diminish.

      Randy

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      Steve, if you can borrow an amp meter, you can check to see if the compressor is pulling more amps than normally required. I suspect the compressor may be the problem.

      Randy

    • profile image

      Lflsteve 

      6 weeks ago

      I have a 2011 forest river wildcat with a dometic ac, the unit starts and runs fine the first time it starts but if it shuts off and restarts within 10 minutes of the last cycle it will trip the breaker. I have checked the ohms across the compressor, the capacitor is ok and I added a supco power boost with no change to the problem. Could this be an internal problem with the compressor? It seems as though the compressor just doesn’t have the oomph to get going if there is any residual back pressure

    • profile image

      RodneyO1 

      6 weeks ago

      I’m a new full timer. I bought a 2004 Fleetwood Terry last September to live in. I’m permanently disabled. I just moved it to the desert where I plan on living for at least a year. It was 104 today which is hot but my AC should keep up. It was working fine the last time I operated it...last September. I found black mold and other stuff so it wasn’t livable for a while. I turned the air on once I got it parked and I was plugged in to 30amp service. It’s cold but not blowing very much and only the two front vents are blowing lightly. The back two are not. I removed the ceiling cover to clean it a few months back but that’s all I’ve done. I’m dying here. I’m also receiving more condensation than I think I should. I’ve got a constant drip off of my roof. The unit is a Coleman Mach I have the vents closed to divert the air to the duct vents but there is nothing in the back.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      Thom, I think there is a dye used to check for leaks.

      Randy

    • profile image

      Thom 

      6 weeks ago

      How do you check for freon leaks

      Is there a dye to put into lines

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      Shannon, have you ever cleaned the coils in your AC? If not, try using some no-rinse coil cleaner as over the years some dust and debris gets past the filter and clogs up the coils.

      This will cause the AC to not be as efficient and will also cause the compressor to overheat and trip the breaker.

      Randy

    • profile image

      Shannon 

      6 weeks ago

      I have a 2002 kingsport cougar 5th wheel camper...the air was really cold & would keep the camper at the desired temp...now its not as cold & constantly runs & wont shut off unless we move the thermostat to around 80...it also thru the breaker inside the camper...any ideas on what could cause this? & what can i do to fix it

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      6 weeks ago from Southern Georgia

      Tricia, more than likely a capacitor went bad. An easy replacement and around $25 or so for the cap. Any local AC or electric motor repair service can test and replace a bad cap.

      Randy

    • profile image

      tricia 

      6 weeks ago

      i have a 2007 13 ft funfinder camper was camping my rooftop ac was running really good than all of a sudden it wasn't blowing any cold air just hot air any idea what happened and what I need to do to get it to blow cold air again

    • profile image

      Jason 

      6 weeks ago

      Is it a good idea to use spray lube intended for garage doors on the moving parts of the AC unit?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 weeks ago from Southern Georgia

      Kathy, try cutting off the AC breaker and the converter breaker. After a few minutes turn them back on and see if the system resets.

      Randy

    • profile image

      Kathy 

      7 weeks ago

      My roof top ac has beeping off and on for a couple of weeks. Removed shroud and cleaned up there, cleaned inside filter, it just keeps beeping. I don’t know what to do, my easycare people can’t cone out for 2 weeks. Help.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 weeks ago from Southern Georgia

      Melissa, it depends on the model you have whether it can be re charged. Most can be recharge by a professional.

      Randy

    • profile image

      Melissa 

      7 weeks ago

      We have a 2016 wildwood travel trailer the air is blowing water on the inside so we are going to clean the coils inside and outside but was wondering if it’s low Freon can we have Freon added was told you can’t add Freon to the newer models is that true?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 weeks ago from Southern Georgia

      Have you had the fan capacitor checked, Anita? If the coils are clean, then yes it could be the fan motor.

      Randy

    • profile image

      AnitaParker 

      7 weeks ago

      We cleaned it so you think it’s the motor? The fan and motor cuts off when it gets hot.

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 weeks ago from Southern Georgia

      Jeff, you can't always find evidence of a leak in the system. Either there's a restriction in the system or it's low on Freon.

      Randy

    • profile image

      Jeff Hendrex 

      7 weeks ago

      I have a single phase 110v rooftop unit on a 40 foot 5th wheel not cooling. Both coils are clean, replaced both start capacitors, both fans freely come on at start up. Compressor runs with 9 amps on white wire, 10 amps on black wire and 2.8 amps on red wire. No signs of refrigerant leaks anywhere. Air filters are clean. Why is the unit not putting out colder air?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 weeks ago from Southern Georgia

      Gordon, half a foot of clearance should be fine.

      Randy

    • profile image

      Gordon 

      7 weeks ago

      Clearance recommendation under a roof for the ac to preform efficiently?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      7 weeks ago from Southern Georgia

      Chris, any AC repair shop can check it for you.

      Randy

    • profile image

      Chris 

      7 weeks ago

      Do you offer service in Leominster, MA? Or do you know anyone that could diagnose my RV air conditioner problem?

    • Randy Godwin profile imageAUTHOR

      Randy Godwin 

      8 weeks ago from Southern Georgia

      Anita, have you cleaned the coils yet? After a few seasons of running the AC, the coil behind the filter will clog up with debris thefilter doesn't catch.

      Go to a local ACE hardware--or online at Amazon-and get a can or two fr two of spray no rinse coil cleaner and follow directions.

      Randy

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