Question about Coleman Mach 15 Air Conditioner

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Coleman mach chill grill - heat turns on whether we have it programed or not. have heat off, ''I feel'' off, can be 80 outside we can be gone and come back to 110 degrees inside and heater on. When it comes on by itself has a ticking noise in ceiling compartment. Only way we can gaurantee that it will not come on is to turn off propane. This is on our 2004 32 ft Everest 5th wheel.

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Sounds like you have a bad thermostat or a short in the wiring. The clicking that you are hearing in the ceiling is a relay in the control board. When this happens, remove the face plate from the thermostat and check for 12VDC between the Blue and the White wires. If there is power then you have a bad thermostat. If there is not power there, then the problem is elsewhere. However, it sounds as if you have a bad thermostat.

Posted on Jul 04, 2009

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Posted on Jan 02, 2017

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