Limit switch issue furnace blower fan wont turn off if the furnace overheats then a limit switch will open.
Rheem furnace blower motor wont turn.
If the furnace starts the problem is either with the thermostat wire or thermostat.
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.
Turn heat to off.
To check your furnace s blower fan for proper operation start by turning your furnace to the off position.
If the blower motor is burned out replace it.
There are a couple of ways to do this depending on your thermostat but the two most common are.
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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Next you will turn your thermostat to the fan only mode.
A sequencer looks like the picture below.
Sometimes my blower fan won t shut off for a while.
In some cases the limit switch will stick open and this will cause the fan to run continuously.
If the blade turns freely test the incoming power to the fan motor.
First make sure that power is getting to the motor.
You might need a new fan center relay if your furnace is equipped fan sequencer or furnace control board.
Tie the red and white wires together and switch the power on.
If the motor bearings are worn out replace the motor.
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.
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 does not turn freely this indicates that the motor bearings are worn out.
That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again.
On 2019 12 28 by jamie.
Replace the wire or thermostat to fix the problem.
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.
Turn the power to the furnace off and disconnect the wires from the thermostat.
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