Dometic Duo Therm A/C reset.

[TheQCollective]

Ok I'm running the full 30 Amp for my travel trailer. I have a non digital thermostat. How do I do a hard reset?

 

[TheQCollective]

I have a Dometic duo therm analog thermostat. Would shutting off the breaker, disconnecting the wires from the thermostat, then reconnecting reset it?

 

[Willhound]

I can't understand why an analog thermostat would need a reset? Is it the old style slide? A pic might help. They either work, or they don't. They can get sticky or contacts get dirty. Either issue is an easy fix.

 

[TheQCollective]

Im just wondering if there is a reset on the compressor or the whole system? Or none at all? I'm new in the RV life. I just know the fan runs in the "on" position but not in the "auto" position. Air blows coolish but not cold. Cleaned the condenser coils too.

 

[TheQCollective]

I can't understand why an analog thermostat would need a reset? Is it the old style slide? A pic might help. They either work, or they don't. They can get sticky or contacts get dirty. Either issue is an easy fix.

Im just wondering if there is a reset on the compressor or the whole system? Or none at all? I'm new in the RV life. I just know the fan runs in the "on" position but not in the "auto" position. Air blows coolish but not cold. Cleaned the condenser coils too

 

[Willhound]

The digital/electronic thermostats have a reset procedure, the analog/slide models do not as far as I know. Yours is different from what I had on our old trailer. You could carefully remove the cover and see if there's anything underneath. There's no reset on the actual roof top unit that I am aware of.
There are some things you can test to see if the thermostat is "talking" to the air conditioner properly but perhaps someone smarter than me can chime in.
I do know that for the air conditioner to run properly the fan should be set to Auto.
Do you hear the compressor kicking in?

 

[jcrevs]

Hard reset of what?

 

[Willhound]

So...you already posted essentially the same question and the answer is the same. There is no reset on an analog thermostat. And no reset on the air conditioner. Either the thermostat is faulty or the air conditioner is not working properly. Here is a link to a troubleshooting guide for what looks like your thermostat in the pic from your other post:

https://techsupport.pdxrvwholesale.com/wp-content/uploads/2017/12/Dometic-Air-Conditioner-Analog-Control-System-Troubleshooting-November-1998.pdf

It requires a good electrical tester, a lot of patience and some rudimentary knowledge of electrical circuits.
Of interest might be section 13 that shows the procedure for using jumper wires to bypass the thermostat and test the various components (heat/furnace, air conditioner, heat strip, heat pump depending on which of these features you have. This MIGHT tell you if the thermostat is faulty or if the air conditioner is the culprit.

 

[Mr. Dan]

Two threads merged and resultant thread moved to Appliances and Electronics

 

[Larry-NC]

I do know that for the air conditioner to run properly the fan should be set to Auto.

Actually that's not correct. You MUST have the fan running while the air conditioner is running; that's what "Auto" does.

"On" runs the fan 100% of the time, so it will be running when the air conditioner runs. It also runs when the air conditioner isn't running, to circulate air in the trailer.

I did notice that the OP has the fan speed switch set to "Lo" instead of "Hi", and that is probably the source of his problem! On "Lo", not enough air flows through the evaporator coils and ice forms on them from frozen water vapor condensation. Once the coils are encased in a block of ice, no air can flow through at all.

DON'T SET THE FAN TO "Lo" WHEN RUNNING THE AIR CONDITIONER.