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Lennox G20Q3/4-100-1 blower will not start. Motor just hums. Is it motor or capacitor?

Burner comes on normally. Blower will turn manually with some resistance. Motor hums with a change in noise level when blower is rotated manually.

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6ya6ya
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Posted on Jan 02, 2017

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  • 124 Answers

SOURCE: fan motor capecitor

go to electric motor shop . take oem capacitor. replace with exact replacement. rule on capacitors is uf or mf rating must be exactly the same. voltage can be higher. for instance if you have a 370 cap you can replace it with a 440 cap but never the reverse. to pull a bad 120 cap and replace it with a 230 cap is ok. but to pull a 440 cap and replace it with a 230 cap is a no no.cap rating must remain the same . volt rating can be higher but not lower.if motor still turns in reverse look at the reversing leads. see wiring diagram on the side of the motor. most replacement motors can run cw or ccw. by switching the reversing leads you can effect direction. usually wired up orange to orange and purple to purple. switch org to pur and pur to org and motor runs opposite direction. be sure you have a new correct cap for the new motor. every new motor should have a new cap and they are different usually.one motor might be a 5 mf cap and the new motor might require a 15 cap! be sure power is off and you check it three ways. looks off, checks off with a meter, and is off when shorted with a screwdriver.good luck

Posted on Oct 18, 2008

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  • 56 Answers

SOURCE: ruud silhouette #UHDG-07EAUER won't heat house

Cleaning the flame sensor has nothing to do with blower motor not turning on. You either one of the following problems 1 bad cap for motor. 2 bad motor. 3 bad limit on blower housing or 4 a bad board. You will need a volt meter to check for these problems. Try seeing if the fans runs with unit of and fan switch turned to on. Also does motor hummmm. Is motor cage free ( can check by manually turning) If motor doesnt humm and the cage is free wheeling then you will need to find out if you have power going to the motor. If you find out that you do then you will need to change blower motor. If you do not have power then you will need to check limit with continuity tester on volt meter. If that checks fine only 1 thing can be wrong and that is the board.

Posted on Feb 16, 2009

  • 252 Answers

SOURCE: blower motor humms but wont start runs slow when spun by hand

nope, need a new motor

Posted on Jun 06, 2009

  • 19 Answers

SOURCE: Blower motor doesn't start with capacitor installed!

you need a meter that will measure uf (micro farads) it should read within about 10% of the rating 12.5uf otherwise you could charge it with an insulation tester (megger) and short the terminals with an INSULATED screwdriver to see if it discharges.

Posted on Dec 21, 2009

Testimonial: "Thanks for the help. I didn't have the propper equipment but a $7.75 risk was easy to take, so I bought capacitor in a local shop and It worked!"

  • 415 Answers

SOURCE: RV AC blower fan turning very slowly

It's the blower motor.........the bearings are seizing up when the motor is difficult to turn with power to it.
Generally, if the capacitor is bad, it won't turn at all or will quickly overheat and go out on internal overload.
If the motor feels "tight" when trying to spin it, the bearings are seizing and the motor will have to be replaced.
If there are oil ports, you might be able to spray some lubricant inside such as WD-40, but this does not always work and, if it does, it is only for a short time.....but it might get you by if you need the A/C and cannot get it repaired immediately.

I hope you find this information to be very helpful to you moving forward. :-)

Posted on May 04, 2010

Testimonial: "Thanks for the help. I'm going to have to buy another motor I suppose. Are they very hard to change out?"

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I have a Samsung electric dryer dv400 that the drum doesn't turn when you press start. It just hums but doesn't turn.


Check the blower housing to be sure there are no foreign objects blocking the blower wheel from spinning, also see if you can turn the drum by hand, but don't spin it more than a foot or two as the belt may come off.

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Since the motor is humming we know it is recieving voltage, try spinning the blower wheel by hand and see if the motor starts up, if it does the capacitor needs to be replaced, if not the blower motor needs to be replaced.

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Blower won't run


usually a "humming motor" indicates either a bad capacitor or a defective motor. With the power off try to spin the blower wheel...it should spin freely. If it is tight or wont spin and there are no obstructions stopping it (like an air filter sucked into blower or other debris) then the motor most likely is seized. If the blower wheel spins free then you may have a bad capacitor. Keep in mind, just because the blower spins easy doesn't mean the motor is good. I have had motors that are defective that dont seize up but most of the time the blower wheel will not spin free if the motor fails.

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I have an old Intertherm gas-fired furnace, Model MGH-055AB which ceased operating last night. It was quite warm when I arrived home, and when I set the heat up a little, began to hum, but the fan would...


Tom P's answer is generally correct: The motor start capacitor is usually not the problem. However, in some cases, particularly on older furnaces, where there were capacitors of certain make and production run will prematurely fail. This happened in March on a mobile home HVAC unit where both the blower fan and condenser fan motor capacitors failed open circuit. Both caps were of the same Mfg, and production lot.
Here is a suggestion (for you or an electrically inclined friend): Locate a substitute motor capacitor having similar Mfd (or MF) and Voltage ratings. Remove power from the unit. Reach into the blower squirrel cage and spin it to verify that the shaft is not frozen. Pull the wires from the existing capacitor noting color and location. Connect the wires to the substitute capacitor and secure it place. Apply power and turn on the blower. A no start? Motor replacement time.

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I have a lennox G26Q3-75-2 furnace it ignites you can hear the pressure switch click to engage blower motor, but blower motor will not turn, its not froze up


Hello, most likely the capacitor has failed and needs to be replaced. the capacitor is a small oval or round can with either two or three prongs on it. When a capacitor goes bad the motor has trouble starting.

Feb 23, 2011 | Heating & Cooling

1 Answer

WHEN PRESSING START UNIT JUST HUMS


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.

Nov 26, 2010 | Amana Dryers

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The circulating fan on a Lennox GR6-25/30B-WH Warm air Heating system fails to run, whilst the burner fires up as normal, any ideas please?


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3: Failed Fan/Simit Switch: this switch senses the temperature in the heating chamber and will energize the motor once the temperature reaches it's set point. If the temperature continues to rise past the LIMIT setpoint, the switch will de-energize the gas valve to prevent damage to the heat exchanger. Here is a video to help you:
http://www.youtube.com/watch?v=G3NRGhR0O8A

I hope you found this information helpful to you.
Good Luck! :-)

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You can hear furnace running but the blower never comes on.


do you mean the inside blower or the outside unit blower ... actually the problem might be a similar part in either case ... the blower motor has a capacitor mounted on it or near it ... it will be marked something like 160 uf at 200vac or similar . it will have wires attached or plugged into it .. the capacitor is what gives the blower motor a signal to tell it which way to start turning ... once the blower is running then the capacitor is no longer needed ... its only used to get the motor started ... if its bad then the motor will hum but wont turn .. if you manually spin the fan then the motor will take off in the direction you spun it (dont get hit ) .. a new capacitor is not expensive .. you need the numbers off the old "starting" capacitor or just take it with you to the parts place to match it up .. you may be able to order it from Ruud ... a HVAC repair person would likely be able to bring one with him for repair if you give him the numbers off the part or the model number of the furnace .. make sure the blower turns freely by hand (with power off) .. if not it may need bearings lubed .. ..

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Replacing blower motor in furnace w/Fasco brand #D727


Some one missed the wiring diagram. I believe its like this:
L1 = Line 1 = (Hot all are same thing)
Black Hi
Blue Med
Red LO
Now usually the black is for AC and connects to a normally Open (NO) contact on the blower relay.
The heater speed (either red or blue) go the the normally Closed (NC) on the blower relay and on one side of this wire or contact on the relay it goes to the heating blower thermostat on the furnace.
The remaining wire (blue or red) you tape off.
L1 also feeds the Run Capacitor on 1 side and the Brown wire feeds the opposite side

The white wire is Neutral and goes to the neutral on the main line.

If this helps you please rate me accordingly and good luck.








Mar 13, 2009 | Kitchen Appliances - Others

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