Question about Dometic Rooftop RV Air Conditioner

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Heater option disappeared

I don't have an option on my thermostat for the heater anymore. It's a Duo-therm model digital thermostat. I used to have the option of A/C, heater, fan and mode off on the thermostat. I don't believe that the thermostat recognizes the heater anymore. I know I have a heater and I've used it before but, when I went camping recently the option wasn't available on the thermostat. Has anyone run into this problem and what might be the fix?

Thanks,

David M.

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  • Dometic Master
  • 6,674 Answers

This link may help you identify what you need. What year is your trailer, & AC unit. Have a model # handy ?Have you checked your operators/owners manual ?
http://www.dometic.com/enus/Americas/USA/RV-Products/climate/ac-display-page/?productdataid=66938

Posted on Aug 14, 2008

  • Mike Butler
    Mike Butler Dec 12, 2011

    Sounds like thermostat was changed and furnace wasn't hooked up either, due to wrong thermostat installed. I have a vision of someone grabbing a thermostat to change a faulty one in summer, then realizing it didn't accommodate furnace, but put it in anyway to get AC working. When you take thermostat off wall my guess is you'll find 2 more wires not hooked up, that will be furnace. Thermostat with furnace as same as other will be needed, or a separate thermostat for furnace beside that one, if method of wiring allows.

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a. Remove the cover of the thermostat.
b. Connect the RED wire from the air conditioner
to the “RC” terminal on the thermostat.
c. Connect the “YELLOW” wire from the air conditioner
to the “Y” terminal on the thermostat.
d. Connect the “BLUE” wire from the air conditioner
to the “H” terminal on the thermostat.
e. Connect the “ORANGE” wire from the air conditioner
to the “G” terminal on the thermostat.
f. Push the thermostat wires into hole in wall and
fill excess hole with insulation.
g. Mount thermostat base to the wall with screws
provided.
h. Check all thermostat wires on base to ensure
they are completely clear of the bimetal coil of
the thermostat. Adjust if necessary.
i. Replace thermostat cover.
If nothing operates on the air conditioner, remove the
return air grille assembly and verify the red, orange, yellow
and blue wires are properly connected (red-to-red,
orange-to-orange, etc.).
Next, disconnect the red wires and check for 12 volt
DC between the red wire from roof section and the orange
or blue wire from roof section. If no voltage received,
refer to Section F2. If voltage is received, the
problem lies with the thermostat or thermostat wires.
Next, disconnect all 4 wires (red, orange, yellow and
blue) from the thermostat. With the thermostat set on
COOL mode, FAN mode set on AUTO and HIGH, and
temperature selector set lower than the room temperature. Check for continuity between terminal RC (red wire)
and terminal G (orange wire); and RC (red wire) and
terminal H (blue wire). If continuity is achieved on each,
proceed with the next step.
Set fan switch to LOW. Continuity should NOT be present
between terminal RC and Terminal H, but present between
the other terminals (Y & G) and terminal RC.
If all of the previous checks are good, the thermostat is
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are not correct, replace the thermostat.

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