Hey Greg

Thanks for taking the time to answer my question. Checking your suggestion will have to wait until I'm ready to pull the unit out. Makes sense though.

For now, I'll just use it by turning the furnace off and on as needed.


GARRY

PS . . . love your signature line!!

Greg wrote:Possibly the low temp. limit switch is bad. That should tell the fan that the unit has cooled down and turn the fan off.

Greg

Would that prevent the gas from turning on again?

I didn't see that switch in the manual (for what it is), where would I find it.

Garry

Duo-Therm 900 series (90030-813) Gas Direct Vent Forced Air Furnace Problem - the system works as it should when I turn the thermostat on with on/of switch. The fan starts, then the heat come on and the space heats up fine. The problem is that once the space is heated, the heat will shut down but th...