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Old 10-13-2009, 09:44 PM   #1
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Trane XL90 problems


The vent blower is constantly running. If I shut the unit off it will come on and run though it's cycle and warm the house to the set temperature on the thermostat, but then when it's done heating and the main blower shuts off as normal the vent blower just keeps running and will not shut off at all. Clueless...

Thanks,
Rich

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Old 10-14-2009, 08:31 AM   #2
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Trane XL90 problems


In my last house I had a Trane furnace, which I can't remember the model of - but XL90 sounds familiar. Anyway, I was having odd fan on-off problems and called a service guy in, it was still under its 5 year parts warranty. Turns out a controller board was burned up. Literally, there were burn marks though the controller board. It's a common problem, and the service guy had plenty of replacements in his van.

Mine would turn on to run heat, kick off and keep the fan still running, turn off, turn the fan on, turn the fan with heat on 2 minutes after turning off - it was strange and irregular. I'm guessing any circuit-board damage could result in any irregular operation though.

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