Dometic roof top a/c unit

[Rudyp]

Good day to all on RV.NET. I recently had a new A/C unit installed on our 5th wheel. We only used it 2-3 times. A couple of weeks ago we tried to use it however it would come on and blowing cold air for @ minutes to 5 minutes; problem is it would stop blowing air completely but the power would stay on.I rechecked the connections. I would turn off the unit at the termostat and wait a few minutes before trying to turn it on. You could hear it click inside the unit and wont turn on and you have to wait awhile longer before turning back on, but then same thing happen's. I called the shop that installed it and they said it could be one of two things that is wrong with it, !. I was told that it could be the Control Box (circuit) box in the AC unit or 2. It could be the thermostat... I asked doesnt the new AC unit come with a control box installed in it? They said no that they took the old one out of the old AC unit and installed it in the new unit... and that it is a seperate part... can some one enlightem me on this? thank you all in advance for the response/help.
Rudy P

[JTLance]

Thanks Doug! That could be it with the speed.

[dougrainer]

JTLance wrote:

Rudyp wrote:
Good day to all on RV.NET. I recently had a new A/C unit installed on our 5th wheel. We only used it 2-3 times. A couple of weeks ago we tried to use it however it would come on and blowing cold air for @ minutes to 5 minutes; problem is it would stop blowing air completely but the power would stay on.I rechecked the connections. I would turn off the unit at the termostat and wait a few minutes before trying to turn it on. You could hear it click inside the unit and wont turn on and you have to wait awhile longer before turning back on, but then same thing happen's. I called the shop that installed it and they said it could be one of two things that is wrong with it, !. I was told that it could be the Control Box (circuit) box in the AC unit or 2. It could be the thermostat... I asked doesnt the new AC unit come with a control box installed in it? They said no that they took the old one out of the old AC unit and installed it in the new unit... and that it is a seperate part... can some one enlightem me on this? thank you all in advance for the response/help.
Rudy P

I have a new Dometic A/C and the box in the A/C overhead area clicks like... A LOT! I have a feeling we have similar issues. I took mine all apart hoping to see a lousy ground but all I got was a really weird plastic 120vac connector vs wire nuts. I have no real info to add, but I would say your probably not alone. Sometimes my fan stops and the condenser pump is still running....the fan sometimes stops for 2-5 seconds when seconds later (while the compressor is still running) the fan will turn back on! Really odd.

Depends on your Dometic system. IF on Auto/Cool, the fan WILL shut off for a few seconds as it changes speeds from Hi to Lo and Lo to Hi. BTW, COMPRESSOR, not Condensor pump. Doug

[dougrainer]

Rudyp wrote:
dougrainer.. I understand what your saying,... my main question is if New Dometic AC units come with a connect box (circuit board) instaled in the unit or does one have to purchase it seperately???

Well you have wasted my time. The reason I asked the MODEL number is simple. Brisk Air Models do NOT have a Control board. Some Penguin Models come with onboard control modules. If you would just post the answers to my questions we could speed up your help. Doug

[MrWizard]

Low voltage could still be a problem
The OP did not mention that here In Southern calif
We had triple digit heat wave for two solid weeks, and high 90's before that
Labor day week end was 116°F plus fires

[jdc1]

50A? That rules out low voltage problems.

[JTLance]

Tell Dometic the wiring is solid!!

https://www.dometic.com/assets/58/71/3315390_55871.pdf

This is the manual for mine....


The box is separate in the ceiling.

Mine is the 640310


I hate this website for adding pictures!!!


I sent you an instant message with my email...

[Rudyp]

JtLance, thks, yes it does seem like the same problem... Did you get it fixed? Im calling dometic now.. the wait on the phone is ridiculous...

[Rudyp]

dougrainer.. I understand what your saying,... my main question is if New Dometic AC units come with a connect box (circuit board) instaled in the unit or does one have to purchase it seperately???

[JTLance]

Rudyp wrote:
Good day to all on RV.NET. I recently had a new A/C unit installed on our 5th wheel. We only used it 2-3 times. A couple of weeks ago we tried to use it however it would come on and blowing cold air for @ minutes to 5 minutes; problem is it would stop blowing air completely but the power would stay on.I rechecked the connections. I would turn off the unit at the termostat and wait a few minutes before trying to turn it on. You could hear it click inside the unit and wont turn on and you have to wait awhile longer before turning back on, but then same thing happen's. I called the shop that installed it and they said it could be one of two things that is wrong with it, !. I was told that it could be the Control Box (circuit) box in the AC unit or 2. It could be the thermostat... I asked doesnt the new AC unit come with a control box installed in it? They said no that they took the old one out of the old AC unit and installed it in the new unit... and that it is a seperate part... can some one enlightem me on this? thank you all in advance for the response/help.
Rudy P

I have a new Dometic A/C and the box in the A/C overhead area clicks like... A LOT! I have a feeling we have similar issues. I took mine all apart hoping to see a lousy ground but all I got was a really weird plastic 120vac connector vs wire nuts. I have no real info to add, but I would say your probably not alone. Sometimes my fan stops and the condenser pump is still running....the fan sometimes stops for 2-5 seconds when seconds later (while the compressor is still running) the fan will turn back on! Really odd.

[dougrainer]

As always, need a lot more info.

Brand Year model of unit
brand(Dometic) and MODEL of AC unit
WHAT type of AC tstat. CCC2 5 Button CCC 4 button CCC
HOW many roof AC units and if more than 1, WHICH zone was the new AC installed on. Also AC/HP or AC only. Doug

[Rudyp]

jdc1, I was plugged in a 50amp.. Only had the one ac unit on ...

[jdc1]

Are you at home? Plugged into a standard wall outlet? How many amps is that wall outlet actually putting out?