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Dometic AC turns off at thermostat setting but does not cycle back on as camper is heating up unless you turn the thermostat to off then back on. changed the thermostat as still have the same problem

Possible bad control board

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

Hi there,
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Posted on Jan 02, 2017

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Anonymous

  • 9 Answers

SOURCE: Carrier XHD183D Through-the-Wall Heater/AC runs constantly

YOU COULD EITHER HAVE A THERMOSTAT PROBLEM OR FAN CONTROL PROBLEM.TURN THE POWER OFF AT THE FURNACE AND TAKE THE THERMOSTAT OFF THE WALL.MAKE SURE YOU MARK THE WIRES SO YOU KNOW HOW TO HOOK IT BACK UP AGAIN.RESTORE POWER TO THE FURNACE.TOUCH THE WIRES THAT WERE HOOKED TO THE R & G TERMINALS ON THE T-STAT TOGETHER AND HOLD THEM THERE.OBSERVE THE OPERATION. WHEN YOU TAKE THEM APART DOES THE BLOWER STOP?TRY IT A FEW TIMES. IF IT CONTINUES TO START AND STOP YOU GOT A BAD T-STAT.JEFF

Posted on Dec 15, 2007

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Don Berry

  • 230 Answers

SOURCE: will not shut off

Sounds like a stuck relay on the unit itself. Maybe there is a short in the control wire that comes from the thermostat that activates the fan.

The thermostat probably has one hot wire at all times. The thermostat then chooses which wire to send the voltage down based on your selection. One of those wires is probably for the fan only. Make sure that it is in good condition (no bare, pinched or wires)

Posted on Jun 17, 2008

Anonymous

  • 61 Answers

SOURCE: heat pump auxiliary heat does not turn on

Turn up your outside thermostat in the outside unit.
You should have about 3 degrees difference in one stage to the next. So I would change the thermosat with one that has three stages of heat.

Posted on Nov 30, 2008

Mark Egan

  • 1214 Answers

SOURCE: rheem heat pump. blower will not turn off

The fans are set to delay for 60-90 seconds to remove all heat from the heat exchanger/heater elements.

If the fan runs any longer than 3-4 minutes after the Emergency Heat shuts off, you may have a bad sequencing relay in the air handler.

Posted on Jan 27, 2009

mastatech

mark milligan

  • 478 Answers

SOURCE: Heat pump cycling on and off.

It sounds as if you you have a low charge of refrigerant, r22. When the unit comes on outside, the outdoor coils become the lowside, there is a low pressure switch that is tripping out contactor protecting the compressor.

Posted on Mar 11, 2009

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1 Answer

Dometic thermostat turns off and comes back on by itself Dometic thermostat model 3314080


Most thermostats operate this way.
Instead of dropping the voltage a thermostat opens the circuit when the set temperature is reached, after which it closes again to redo the cycle again. The principle can be based on heat, time or pressure.
The animation, if the GIF runs, shows the basic principle for a thermostat switch in a heater/geyser, but can be modified to operate via a pressure diaphragm as used in ovens and fridge compressor relays. Strip heats/opens then closes.
ani_tstat-zmuafnxooa32kctobknhkzt2-5-0.gif

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I have a Dometic 15K roof Ac on my FW. After the AC reaches therm temp, the compressor and the fan turn off, but the fan starts right back up again and runs until you set the thermostat on off.


That is normal operation, only the compressor cycles, the fan stays running to keep air circulating for better temp control. Otherwise the rear of the space could get 5 degrees warmer than the front

If you need further help, I’m available over the phone at https://www.6ya.com/expert/michael_70df8fb57a5e233e

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hi there,
ac not cycling off,the thermostat is not working
have to replace a new one.havve anice day fix my rate thanks

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The fridge will not turn on. Should I be turning on the 100 switch, even if the camper is plugged in, and the lights are working?


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We hotwired the thermostat wires and the furnace started. That told us that the problem was with the thermostat. We took our remote control to another camper like ours and our remote worked their furnace. That told us that the problem was in the ceiling control for the furnace/ac. But the man who owned the other camper told us that he had a problem, too, and was told to unplug all the electric including the battery, wait 2 minutes, and hook up again. This might reprogram the circuitboard, and voila! It worked.

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