I have a Trane that's driving me insane. The blower has a mind of it's own. It runs totally at random. I kept a diary for a several weeks. Blower will run for an hour, off 15 min, on another hr. Spool up, spool down, shut off, totally at random. It heats and cools perfectly when called for. But fan runs blowing cool air when ever it feels like it, at different speeds and durations, regardless of thermostat settings or outside/inside temp. I have even taken thermostat off the wall, to no avail. Powering down the unit is only remedy. I had a tech out. Unit had no codes. He replaced blower control board and thermostat. No change. I'm a retired new car mechanic, so I'm no stranger to chasing gremlins, but this one has me stumped. I think maybe an experienced factory trained Trane tech might help, but there are none in Tucson.
It's a two stage gas electric convertible 4 ton YCZ050-SF-1B. I would be grateful for any advise.
General topics about all things heating, ventilation, air conditioning and refrigeration.
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