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Blower motor will not come on, there is a hum in the fan limit switch when the blower is turned on

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This is either the motor itself or a capacitor. To check the motor use an amp meter. Clamp the meter around each power lead seperatly try to cycle the motor and verify the reading on the meter. After you have done this check the LRA (locked rotor amps) rating on the motor I.D. tag. If the readings you saw are near or higher than those listed on the motor tag then the motor is bad. Feel free to comment me if you need any other assistence.

Thanks

Posted on Aug 28, 2008

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Why isn't my Rangemaster Hood blower turning when switched on?


Hi Ed
Being a range hood & subjected to cooking fats etc. It might be gummied up around the fan and just require cleaning!
But.... you said it was humming and there is a capacitor close by.
Then it's probably an induction motor thats not getting kick started by the Cap. While it's humming, use a finger (or stick) to push start in one direction or try other direction. If it spins up and stays going.... you've found the problem. The Cap is not kick starting in the right direction. Remove the Cap (with AC Disconnected) and check the values to get a similar replacement.

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How do I wire a induce fan motor


Induced fan motors on older units are wired through the high limit safety on the stack - in series. When the furnace calls for heat, the induced fan motor comes on and after a time the furnace will light.

Older units have a temp switch in the stack that rotates to bring on the burners and blower motor. . When there is a call for heat, the induced draft fan motor comes on and then the burners will light.

After the heat exchanger is warmed up the limit switch will bring the blower motor on. That's basically how it works - there are two circuits - one for the induced draft motor and the burners and the other for the blower and high limit.

New units have a plug on the board you just plug in.

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Oct 04, 2014 | Heating & Cooling

1 Answer

Lennox G12 furnace blower will not come on.


It may be a bad fan limit switch or a bad fan motor.to check the motor turn the thermostat fan setting to fan on or jumper between R and G where the thermostat wires connect to the furnace. If fan comes on the fan motor is probably good and it is probably the fan limit switch. If it does not come on it is probably the fan motor . This is assuming you haven't installed a new thermostat in which case it may be a heat anticipator setting too low.hope this helps.

Dec 07, 2013 | Heating & Cooling

1 Answer

1993 Ford Escort Blower Motor & AC Switch


I'm going to start from the beginning.
The blower motor gets power from the high blower relay and it is grounded thru the fan switch and the resistor. So you should have power on the pink white blower wire coming from the high relay to the blower motor. The orange black wire from the motor is ground going to the resistor and fan switch. The blue wires on the control panel are for the ac compressor.
The high blower relay gets power from fuse number 5 in the box. The blower motor is grounded thru the resistor and then thru the fan switch.
Photo courtesy of AutoZone.com
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Jun 10, 2013 | 1993 Ford Explorer Limited

1 Answer

Blower motor hums, but does not turn on


Try spinning the blower wheel by hand to see if it starts, if it does a new run capcitor will be needed. If not a new motor will be needed.

Dec 26, 2012 | Goodman Heating & Cooling

1 Answer

I turn the thermastat to heat on my goodman gms90904cxa and the inducer fan does not come on and after a couple of seconds the lights blink 3 times


Hello, a 3 blink pattern indicates a open limit switch. Most of the time a dirty filter, dirty blower wheel, weak blower motor, can cause the limit switch to open.

Oct 02, 2011 | Goodman Heating & Cooling

1 Answer

When main switch to heater is turned on, only the flame comes on - no heat or blower. Have tried numerous times to reset by turning main switch off for five minutes, but still does not work. Any...


Does the fan come on when you turn the Fan to ON at the thermostate? If it does then it could be the blower board not turning the low speed blower tap on. Or the Fan & Limit switch not working. If the fan doesn't come on in the on position then the blower motor could be out or the run capacitor.
If the blower comes on it the ON position then you can run the heat with the fan in the ON position till you can get the heat relay looked at.

Dec 21, 2010 | Heating & Cooling

1 Answer

Blower fan keeps trying start


Replace the start capacitor on the blower motor.
If that does not correct the problem replace the motor.

Apr 04, 2009 | Carrier Heating & Cooling

1 Answer

Dryer not turning. belt is good


Motor If the dryer motor only hums when you press the Start button, the motor may be burned out. Here's how to test the dryer motor:

  • Remove the belt.

  • Check for obstructions in the blower fan housing.

  • Manually rotate the shaft of the motor.

If the motor is very stiff, or impossible to rotate manually, and the blower fan housing is clear, you need to replace the motor.

If the motor rotates freely, run the motor momentarily with the belt removed and the blower in place. If the motor runs fine with the belt removed, there may be a problem with the idler pulley or the clothes drum. Try to rotate the drum by hand. If it is very difficult to move, correct any problem with the rollers or pulley, and then reassemble the dryer and try it again.

If the motor hums but doesn't rotate on its own even with the belt removed--yet you can turn it freely by hand--you usually need to replace the motor or the motor start capacitor.

Door switch Your dryer can't operate at all if the door switch is defective. It's inside the dryer main housing near the door frame. Sometimes you need to raise or open the top or front of the dryer to reach the switch. If it's defective, you need to replace it.

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