Forum Discussion

Tbucket's avatar
Tbucket
Explorer
Nov 16, 2015

A/C Turns on when I turn on the heater

When I turn on my heater the A/C also turn on.
Is a gas furnace. So I have to turn the A/C beaker down.
If I only use the A/C it work fine.
Any ideas.
I think my digital thermostat is damaged ?
  • jetcare's avatar
    jetcare
    Explorer
    Nov 16, 2015
    If you have a newer style Dometic Thermostat, push the Mode button so that the FAN position is illuminated. Use the +/- buttons to move the fan to AUTO. Right now, you have it in the Low or High position.
  • Snowman9000's avatar
    Snowman9000
    Explorer
    Nov 16, 2015
    It's probably the AC fan only, not the compressor. I had the same issue. It was the setting for the fan. It was a little confusing if I recall. But you need to change it to Auto. IMO it is poor logic by the thermostat designer.

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