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furnace start needs AC cycled to start

Posted by Victor111 (My Page) on
Wed, Dec 12, 12 at 9:38

I have a TRANE furnace that at times will need to have the main AC switch turned OFF, then ON to start. Thermostat is OK.
Any ideas? Thanks.


Follow-Up Postings:

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RE: furnace start needs AC cycled to start

What do you mean by the "main AC switch". Are you talking about the circuit breakers in the electrical panel or something else?


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RE: furnace start needs AC cycled to start

Service toggle switch next to unit.


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RE: furnace start needs AC cycled to start

I assume this switch supplies the 120V power to the furnace. It could be a number of things, but my suspicion it is a control board problem.


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RE: furnace start needs AC cycled to start

Mike,

Thanks for the response.

I tend to agree with you.

It could be a limit/safety switch setting an indicator on the control board which gets reset on power down! All I know is that the thermostat says HEAT ON and when I cycle the service switch the unit fires up.

The vent blower starts up, the ignitor lights up, the burners light, and the air circulation blower finally comes on. I plan on replacing the ignitor anyway, it is 17 years old.

Victor


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