Originally Posted by Jacquez707
Is it a DIY fix? Cuz mine isn't able to be moved at the moment. We live in it while our house is being built. So I need to fix myself.
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Hi make sure the TT has a solid 12 volts! Furnace will not run if battery power falls below 9.5 volts to the module board. Is the TT plugged into a 110 volt ac power supply to charge the battery. The furnace is a big power hog and will suck the life out of a battery very quickly. If you have a solid 12 volts from the battery make sure the switch in the thermostat is making contact and supplying 12 volts to the furnace. The white wire on the back side of the thermostat should have 12 volts. It supply's the furnace module board 12 volts to start. If you have 12 volts there is 4 possible problems with the furnace not wanting to start.
1/ fuse blowen to the supply power to the furnace.
2/ You may have an higher end electronic thermostat and is it switch over to heat or the control module in the air conditioner has failed and not commanding the furnace to start.
3/ Sail switch to prove the fan blower is running and moving air is stuck in the closed position. This switch needs to be open no air flow to start the furnace. This is not a very common problem but can happen.
4/ The module board has failed in the furnace.
Hope this helps Tim