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huron52's avatar
huron52
Explorer
Aug 18, 2016

How do I trouble shoot my thermostat to rule it out?

Looking on the internet I think I have a Coleman Mach 7330-3322. When I turn it from off to either heat or cool I get the fan on the heater. From my search I have found I have a Green wire- High Fa...
Old-Biscuit's avatar
Old-Biscuit
Explorer III
Aug 19, 2016
T-stat can not control just furnace fan.
Furnace fan should come on when you select 'heat' (and t-stat set point is higher than inside temp) but after purge cycle burner should light off

But for furnace fan to come on when you select 'cool' indicates problem is with furnace fan control (circuit board)

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