Furnace wont cycle off - 2014 Gateway 3650 BH

danemayer

Well-known member
Hi Cottonman,

Welcome to the Heartland Owners Forum.

The thermostat operates a relay that's typically located in the living room air conditioner. On models with a large air intake, there's a metal box above the intake. Not sure how it's located on models that have intake vents spread out along the ceiling. That relay sends power to the furnace circuit board to turn on the blower, open the gas valve, and fire the ignition spark.

When the thermostat is satisfied, the relay opens and it drops power to the circuit board shutting off the furnace.

Since you've already had the thermostat replaced, the suspect items are: the relay and the circuit board on the furnace. If the relay is stuck, it would be equivalent to the thermostat never reaching your set point temperature. BUT, if you can hear that relay clicking, then the problem is probably the circuit board. It's also possible the gas valve is sticking open, but I'd consider that less likely.
 

GWRam

Well-known member
If you have heat all the time then relays or circuit boards probably.
If its just air movement then check your thermostat and make sure fan is set to auto. In auto fan only runs when furnace runs, set to high or low the fan runs all the time at selected speed for air circulation.
Dave


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