No Power to HVAC Unit


Old 11-06-17, 10:39 PM
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No Power to HVAC Unit

Hello everyone.

This is regarding a Luxaire Furnace Model G8T06012UHA11A. As of 48 hours ago the system was running without issue.

I cam home from work toady and switched the unit to heat and got nothing. Upon inspection and turning the power on and off I noticed there was no audible "hum" from the transformer which previously was always noticeable. I turned the fan on at the thermostat and get nothing; no clicks, hums, nada.

So, I removed the transformer thinking maybe it took a crap, but the resistances on the primary and secondary both check out. Circuit breaker is fine. Fuse on the board is fine. When power is going to the unit the light on the board is out. I've given all the wires a little jiggle with power to the unit and no signs of life from the control board light.

Thoughts? Dead board?

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Old 11-06-17, 10:46 PM
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Check for 120vac TO the transformer and check for 24vac OUT of the transformer.

Remember.... there is a safety switch on the blower door that kills the entire system.

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