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Identify Problem
03
Find Solutions
01 - Furnace Blower Motor
The blower motor blows air through the return vent, past the heat exchanger, and into the home’s venting. First, make sure that power is getting to the motor. If power is getting to the blower motor, but the motor does not run, the motor may be burned out. If the blower motor is burned out, replace it. If the blower motor hums, check the blower fan to ensure that it spins freely. If the blower fan is unobstructed but does not spin freely, replace the blower motor.
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Highly Likely
02 - Furnace Capacitor
If the capacitor is defective, the fan motor might be noisy, overheat, or not run at all. To determine if the capacitor has failed, inspect the capacitor. If the capacitor is bulging or leaking, replace it. The capacitor can also be checked with a meter.
Highly Likely
03 - Furnace Wifi Thermostat
Check to see if the furnace blower comes on when you jump the control board contacts for the red (“R”) and green (“G”) wire terminals. If it does, then it's likely the WiFi thermostat is defective and unable to alert the furnace control board to turn on the blower. You will need to replace the WiFi thermostat to regain control of the blower.
Highly Likely
04 - Furnace Wall Thermostat
Check to see if the furnace blower comes on when you jump the control board contacts for the red (“R”) and green (“G”) wire terminals. If it does, then it's likely the wall thermostat is defective and unable to alert the furnace control board to turn on the blower. You will need to replace the wall thermostat to regain control of the blower.
Highly Likely
05 - Furnace Control Board
The control board regulates the power supply to all of the components of the furnace. If the control board is defective, it might not send voltage to the blower motor.
Common
06 - Furnace Motor Control Board
The motor control board helps to maintain the desired motor speed of the blower. When the motor control board fails, the blower motor may not run at the correct speed or it may not run at all.
Common
07 - Furnace Blower Housing
Check the blower wheel to ensure that it spins freely. If the wheel is obstructed, that will prevent the blower from running. A damaged blower wheel and housing should be replaced. If the blower wheel and housing are in good condition and unobstructed, but the blower wheel does not spin freely, the the blower motor has likely seized and will need to be replaced.
Common