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How do I fix my Trane air handler to keep it from turning off about 20 seconds after being commanded to turn on?

My Trane air handler has this problem: Whenever the thermostat commands it to turn on, it will come on for about 20 seconds and then turn off, but the heat pump outside is still running. The air handler will eventually come on again about 1 minute later and stay on. The startup capacitor had been replaced by a local HVAC tech because he said its capacitance was fluctuating, but that didn't fix the problem. What is possibly the culprit?

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Some units require both a start and a run capacitor. It's possible the wrong capacitor was replaced. It's also possible to add a run capacitor to a system to keep the fan running. There is an outside chance the bearings in the fan motor are worn to the point it's time to replace the motor.

Posted on Apr 07, 2015

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Posted on Jan 02, 2017

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