trane xl 80 fan slow to start

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trane xl 80 fan slow to start

Postby zekeharley » Sat Mar 02, 2013 8:11 am

I have a trane xl 80 gas furnace model tdd080r936a1 and the blower fan seems to take a long time to spool up. One time it didn't start and the thermal overheat tripped causing aa 4 flash error code on the controller. Is this a symptom of the blower motor going bad? Or could it just be the capacitor? Is there a way to test further? Thanks for any help.
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- trane xl 80 fan slow to start

Postby Freon » Sat Mar 02, 2013 4:30 pm

Most likely the run capacitor is going. It's an inexpensive part that's easy to replace. Turn off the power and open the motor compartment to gain access to the motor. The capacitor will be mounted on the motor case or on the furnace frame and has 2 wires. Remove the capacitor and get an IDENTICAL replacement... same microfarad, voltage and physical shape. I would go ASAP since you don't want to burn out the motor with a bad capacitor. You may have to go to an HVAC supply house for an exact match.
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