RV Air Conditioner Troubleshooting: Start Here! [4K] 

Fantastic video. Bought a ‘91 camper to move across the country with and the AC kept having issues on the worst days. Got desperate and watched a few videos. This one was definitely the best video and we got the camper from over 100 degrees back under to a comfortable level, saving the dogs and wife. Thank you very much for the video 👍

Late to the party, but for anyone else having the issue, dust is also a major contributing factor. When the fins get Dusty they hold on to the moisture and Ice builds up very very quickly. That being said, I do thank you for this video because it actually helped me out quite a bit! I was running off my generator and with everything I have running, it had bogged the generator down a little bit so although it was getting almost 116 volts which is much more than needed, it was cycling at about 56 Hertz because of the heavy load on the geny. I increased the load side of the throttle a little bit and brought it up to 59 Hertz and that completely solved the issue for me. Thank you again

Love ❤️ your posts. Looking forward to your new battery presentation!!

Thank u this was very helpful. We found out our filter was filthy. It seemed to fix the issue we were having.

I would suspect long duty cycle and low air flow. Amp feed should not effect it unless you have large voltage drop. If voltage is correct amperage would be based on load and if you can only feed 20 amp because of fuse/breaker if load takes more then it would trip. Check air exit and inlet for blocks and fan rotating at correct speed. Use a coil cleaner to clean evap coil

U helped me out, IT WAS MY AMPERAGE I also cleaned the coils tho. Thanks for the tips

It can be ether air flow or and issue with subcooling and super heat, aka your low on refrigerant, so temp of evaporator drops to freezing( witch is not something you want an conditioner doing). Can't really say too much more without seeing the frost pattern as it could also be a few other things.

Thank you chief

Just put in a Coleman- Mach replacing a Carrier but using a adapter kit to keep the Carrier control. It works, but turns off after about 15 minutes and comes back on after a couple minutes. Did I do something wrong?

I have also read that fan set on medium with temp set on colder, will cause freeze u. Is that R-22, Mine is and I can't find it anymore.

Frost can be due to low air flow or low Freon or temp. set too low. Most likely the problem is low Freon. Motor speed is a function of line frequency and number of motor poles. As long as there is no mechanical binding, the fan speed should be ok.

Hi i have a coleman TSR in my caravan when i turn it on theirs nothing no sound or anything any ideas what it could be will i check to see if power is going to it or do i spin the fan

I would tend to agree with your low airflow diagnosis, but I am not so sure low source voltage is the culprit. I am aware you know all of what I present below (my semi random thoughts), but my conclusions may be different, I have the same unit which used to be on my RV's roof. My roof is flat and the AC has enough weight to create a pond and cause chronic leaking. I removed the AC, and all other roof vents, so there will be _no_ roof penetrations when I rebuild my roof, but I digress. The fan motor is an induction motor so it has a large starting current. My guess is that, if your source voltage had trouble running your fan, it would have no chance at starting it. Usually the compressor is hardest to start and will go into a bucking mode until it trips the thermal overload. The fan motor drives the condenser and evaporator fans, so if the fan runs too slowly, my guess is that the AC might not be able to shed enough heat to let the evaporator chill. If the fan induction motor doesn't get enough run voltage it will slow down but the rotor/stator slip rate will stall very early (maybe 10 percent at most?) and the impedance will drop the motor into thermal overload or trip a breaker. I may be wrong here, but if the refrigerant charge is too low, the evaporator will vaporize the liquid shortly after it enters the evaporator coil, so will likely frost a corner of the evaporator rather than the whole evap. unit. All of these issues should be fairly easy to check, but it takes time and a clear understanding of how motors and refrigeration interact. In my opinion, by modern standards these RV AC units are terrible. My plan is to make or modify a mini-split from a modern window or automotive AC using R290 or R600a with a vfd or esc running each of the fans and the compressor. The only wall or floor penetration will be the refrigerant lines. The starting current will be almost eliminated due to the the full RPM range feature on all motors. This system could also be configured to run directly from your PV panels or almost any other source. A modern electronic expansion valve could also be used. Additionally, this design could be expanded into a heat pump. (BTW, I also ditched the propane fridge for an R600a mini-fridge, and 6 gal. electric water heater, no more propane in my rig, or at least not for burning). The above is just my opinion, if anything new develops in your neck of the woods, please let us know.

Could you tell me what type of freon my 2003 roof top ac uses

meanwhile your are liquid flood back to compressor you may need to brush up on electrical a bit

Low freon will also cause icing up issues maybe get a hvac guy out

Amp/volt analysis is wrong. What is the draw?

My ac won't even turn on it trips the breaker in like half a second. And everything is clean. What should I do?

Great video man !! It’s normal the compressor is hot ?? I touched the compressor today when I was checking all the unit in the roof of my rv … the others hoses was super cold but the compressor tank was hot …

Do you know what this AC model number is?

What is the model number of your a/c?

Not the amps bud. If you had either to much voltage drop or to small a wire the AC would either not run or run bogged down. This is more of AC problem than it is an electrical one. Hope you got it working.

front coil looks dirty to me

Your public misses you!

🙏 thanks

You should disconnect the power and short out the start capacitor before messing with an AC. A start cap has enough stored juice to kill you. Ive run into a lot of aggressive dogs but no wasps repairing AC.

So, lack of power. Just great. Lotsa help with a real problem.

extension cord too long or too small could be problem

We replaced an old Dometic in our 36 foot camper (vented). ru-vid.comUgkxDDbPbIlwLRcX_ntp51ui5UMtAUGpHYxE The install was a simple swap, all holes lined up, the electric plug back in with no trouble. Getting it on the camper was the most "difficult" part of it, and my friend made it look easy. I've seen people "sled" them up ladders as well though. I watched a RU-vid video for instructions, very easily done. Some say it doesn't come with instructions, but I found the instructions under the ac in the box. I didn't need them, but they were there.It works well to keep a 36 footer comfortable, all by itself. It doesn't seem to be any quieter than the original, but it isn't any louder either. We're very pleased with it. Esp with the ease of swapping them out.

My ac is a dometic had to put new fan capacitor and even new wall controller but it just continuously runs doesnt clcle off cools good it did cycle on and off for an hour but i have to turn breaker off to let it rest any ideas???

😃👍🏻👊🏻

It doesn't make the air cold it removes the heat from the air

Get a soft start Programmer.

NOPE... that unit should run on 15 amps or less...