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thestarfinder's avatar
Mar 25, 2017

Dometic Comfort Control 2 Thermostat issue

Dometic Comfort Control 2 model#3314080.xxx(without dehumidify)
My zone 1(front AC/HP) HP mode seems to be stuck on HP/FURN it trys to start then it flashes HP then to FURN and will not run the heat pump on the roof(it has never done this in the past) It started when it went into the defrost mode and when it tryed to start the heat pump it is now showing the HP/Furn flash back and forth.
It is not connected to a Furnace....somehow it thinks it wants to switch to a furnace that it is looking for but cant fine because it is not hooked up to one.....I'm hoping for a reset button on the roof unit...I looked for one under the shroud and in the compartment where the mother board is.and couldn't find a obvious reset...
I have it for 4 years and never had a problem.....
The AC(Cool mode) works fine....The Auto mode works fine...
Zone 2 the (back AC/HP) works fine in all modes....
Any thoughts will be appreciated...Thanks in Advance,Tom
  • Turn off any fluorescent lights and reset the thermostat by removing the fuse. Let the thermostat re-boot and see if it works.
    Flourescent lights when the ballast is failing puts out a signal that disturbs the thermostat signal.
  • I am so glad that when I installed a new Dometic AC(zone 1) this week and hooked it up with the old Dometic HP/AC in the front(zone 2), I did not have to also install the Comfort Control 2 thermostat. We have had to many friends with the newer CC 2 have problems. Our old CC has worked flawlessly for 12 years now. Good luck on finding your problem.