Our Trane XL80 gas furnace will not come on. Turned thermostat all the way up and turned the fan to on. Nothing, no heat, now blower. Tried turning on the A/C and nothing happened. Followed the reset instructions and nothing happen. It seems to be dead. Help it is very cold outside, below freezing. What could be wrong?

Start by checking the circuit breaker in the main electric panel. Then check/test the on/off switch next to the furnace. From your description you lost 120 volts the furnace.

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Originally Posted by hvac1000

Start by checking the circuit breaker in the main electric panel. Then check/test the on/off switch next to the furnace. From your description you lost 120 volts the the furnace.

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Checked circuit breaker, it is OK. The switch is working.

Check to see if there is a fuse on the circuit board in the furnace.

Check the switch on the blower door. The blower door on the furnace usually has a interlock switch . If this goes bad the furnace will be dead. Check it with a meter or other testing device.

You said the switch is working. Did you test the switch with a meter to see if electric is on after the switch or did you just flip the switch up and down?
Just had to ask.

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Originally Posted by hvac1000

Check to see if there is a fuse on the circuit board in the furnace.

Check the switch on the blower door. The blower door on the furnace usually has a interlock switch . If this goes bad the furnace will be dead. Check it with a meter or other testing device.

You said the switch is working. Did you test the switch with a meter to see if electric is on after the switch or did you just flip the switch up and down?
Just had to ask.

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hvac1000- You were right, did lose the 120 volt power. The wires in the ignition box some how came out of the connector cap. Twisted the connector cap off and put the wires back together. I notice that the color coating on the wires started melting a little, sticking them together. We got our heat back about 2am in the morning. Good thing we have a gas fireplace that heats the house. Thank you so much.

Glad to be of service.

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Originally Posted by hvac1000

Glad to be of service.

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I thank you.