Trane xv80 - not starting on heat setting

Old 10-03-19, 07:16 PM
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Trane xv80 - not starting on heat setting

I've got a solid red light and a buzzing noise but the fan doesn't kick on and the burners don't ignite. Everything works fine on the cooling cycle.

Odd thing, the blue wire isn't connected to anything at the bottom of the board.

Any advice would be greatly appreciated
Old 10-03-19, 08:17 PM
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Welcome to the forums.

We need more information.
What is the model of the thermostat ?

What would be real helpful is a picture of the thermostat wiring with the thermostat pulled off the mounting base and a picture of the furnace board/thermostat connections.

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