Peter Wigle
09-04-2008, 07:48 PM
Tempstar High Efficiency furnace had a hum/buzz typical of a motor trying to start: With the panel removed, and depressing the cut-out switch the fan motor (or something on the electronic panel attached to it) made this sound. The thermostat was set to OFF (set to engage neither furnace nor A/C), and the fan setting on the thermostat at Auto. I didn't think the fan would be trying to start under this scenario.
When I changed the fan setting at thermostat to ON the fan would spin - after a brief delay (3-4 seconds) but with the same noise.
The house is vacant, gas turned off, and only the AC has been used in the last several months.
The fan is dirty - lots of vibration when it did run (7 years old).
The prospective buyer is having a tech in tomorrow, but in the meantime, I'm curious. Any ideas?
When I changed the fan setting at thermostat to ON the fan would spin - after a brief delay (3-4 seconds) but with the same noise.
The house is vacant, gas turned off, and only the AC has been used in the last several months.
The fan is dirty - lots of vibration when it did run (7 years old).
The prospective buyer is having a tech in tomorrow, but in the meantime, I'm curious. Any ideas?