In some cases the limit switch will stick open and this will cause the fan to run continuously.
Rheem furnace blower motor wont turn.
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If power is getting to the blower motor but the motor does not run the motor may be burned out.
Check your blower motor if your furnace still won t turn on you don t need to know what a blower motor is to check that it is working properly.
If the motor bearings are worn out replace the motor.
There are a couple of ways to do this depending on your thermostat but the two most common are.
Replace the wire or thermostat to fix the problem.
This problem of getting a humming noise along with little to no spinning is very common with motors that do not have good quality capacitors.
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Tie the red and white wires together and switch the power on.
To check your furnace s blower fan for proper operation start by turning your furnace to the off position.
On 2019 12 28 by jamie.
If the blower motor is burned out replace it.
My furnace fan in my house won t turn off when my unit is off on 2019 12 28 by mod jamie perhaps there is a defective fan limit control or fan relay control switch.
Sometimes my blower fan won t shut off for a while.
Turn the power to the furnace off and disconnect the wires from the thermostat.
You might need a new fan center relay if your furnace is equipped fan sequencer or furnace control board.
If the furnace starts the problem is either with the thermostat wire or thermostat.
Limit switch issue furnace blower fan wont turn off if the furnace overheats then a limit switch will open.
A sequencer looks like the picture below.
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Next you will turn your thermostat to the fan only mode.
Turn heat to off.
If your furnace won t turn on go to your furnace if it is accessible to you and peak in the little plastic window on the side of it most modern furnaces will have a window.
If the blade turns freely test the incoming power to the fan motor.
The blower motor blows air through the return vent past the heat exchanger and into the home s venting.
Motor humming without turning if your furnace blower motor hums when it s switched on but at the same time does not actually turn the capacitor may be damaged.
If power is getting to the fan motor but the motor won t run this also indicates that the motor is defective and should be replaced.
