Quote:
Originally Posted by Theradiokid
If your fan does not stop after popping the thermostat off, then the problem will be the fan in your furnace enclosure ("Air Handler" or "A/H"). There is an electronic control module (ECM) on the end of the fan that manages on/off and speed which has been known to fail. I replaced mine by myself a couple of years ago for about $250. Furnace models are fairly common here, so your tech may have a compatible module. If not, they may recommend replacing the entire motor. With labor, you should expect to pay quite a bit more for this. I hope your problem is simpler than this... good luck.
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Thank you. This is what it turned out to be, a bad ECM. I had a service call with SunKool who replaced the part, thankfully still under warranty. He said normally it's an $800 job, and another $800 if the motor is bad. It took him about 15 minutes, so it looks easy enough to do if you know what you're doing.
He also told me this is a very common problem in the Villages due to voltage spikes in the electrical line which reaks havoc on the low voltage motor module, and that my whole house SECO surge Mitigator will not protect it. SunKool does offer an HVAC surge protector (<$200 P&L) which should protect against such voltage spikes. I'm thinking it might be a good investment once my unit goes off warranty.