Trane xe60 shuts down after minutes-sensor cleaned!

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Old 05-01-10, 10:34 AM
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Trane xe60 shuts down after minutes-sensor cleaned!

I own a Trane xe60 propane furnace. It shuts off after a matter of minutes before reaching temperature. I've cleaned the heat sensor today and last year replaced the motor and capacitor. When the furnace first fires up I hear a buzzing sound coming from the silver box on the right hand side. It buzzes for a few seconds, stops, starts again, etc. Then the furnace fully ignites, might blow hot air for a few minutes. All the while the buzzing is continuing. Then, it shuts down. Few minutes pass, the furnace tries again. Then it poops out for good. Help please.

Many thanks!
 
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Old 05-02-10, 02:22 PM
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Originally Posted by mumph32 View Post
I own a Trane xe60 propane furnace. It shuts off after a matter of minutes before reaching temperature. I've cleaned the heat sensor today and last year replaced the motor and capacitor. When the furnace first fires up I hear a buzzing sound coming from the silver box on the right hand side. It buzzes for a few seconds, stops, starts again, etc. Then the furnace fully ignites, might blow hot air for a few minutes. All the while the buzzing is continuing. Then, it shuts down. Few minutes pass, the furnace tries again. Then it poops out for good. Help please.

Many thanks!
If it was the heat sensor, it would more than likely shut off in a few seconds - not minutes.

Not sure what that box would be, for sure, on the right furnace wall? Possibly that is where the incoming 120 volt power enters from? If so - on some furnaces, that would also be where the transformer is, and also a multi-terminal sequencer relay, inside that box. If that sequencer relay does not work, you lose power to even the ignition module, and everything shuts down. How?: What that does is first shut down an inducer fan. It shuts down because the sequencer has both 24 volts and 120 volts at it's appropriate terminals. And if that sequencer does not make proper contact, then the inducer fan cannot run, and cannot pull a necesary vacuum, needed to energize the 24 volt safety circuit. And if the safety circuit can't work, it kills power to the ignition module, which then shuts off the gas valve, including any type of ignitor, along with the inducer fan.
 
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