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Not running at251201-01

Not running at251201-01 I have power to motor....cap 271u , It ran shortly this morning

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Check if the motor winding is still OK. (Not grounded or
burnt windings) If still ok, replace the starting capacitor
and running capacitor of the motor. Start it up, see if
this will run normally. If it doesn't, check the centrifugal
switch. All this tips is for a capacitor start and run motors for pumpmotor service.

Posted on Nov 25, 2009


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Replace the fan motor and capacitor. If you want to go the cheaper route, change the capacitor first and try to run the unit. The cap. is what gets the fan motor running on start up. Another way to test it is to manually turn the fan bade and while it's still turning, make sure your hands are clear of the blades and turn the condensor on. If the fan runs normally, then it's your fan capacitor.

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Our York P4HUB12N08001A furnace has an A/C unit installed and we are running it in cool mode for the summer. Yesterday, my wife noticed a repeated hum from the furnace, and the house was 4 degrees warmer...

A fan capacitor can be bad 'without' showing any visible defects - so - I would 'First" try a new capacitor, be sure to take the old one (after you've marked the wires for easy re-wiring) and get an exact replacement.

However, a fan motor running at a 'reduced speed' as yours is doing is - more than likely - because of a defective/shorted motor, although replacing the cap is a smart move (since it's possibly the problem here) and so much cheaper than a new motor.

I'm thinking the moter is shorted - but it's possible the cap is (shorted) - in which case it's possible that the shorted cap has shorted the motor too - meaning a new cap is essential when installing a new motor so it doesn't happen again.

You might look around in your electrical compartment (with the power off) for any sign of shorts, i.e. burnt wires, blackened areas around metal, etc. etc, although I wouldn't hold much hope for that being the problem. Note: if you find a short 'before' changing the fan capacitor - I would "still" change the cap.

If you find a short (in the electrical wires) - you can fix/repair it and 'clear the short,' and see if the motor will run correctly.

fyi - I was once told a 'shorted motor' will not run.
In my experience I've seen "plenty" shorted motors that 'run,' albeit usually at a slower speed - so don't let anyone tell you a shorted motor won't run.

good luck!

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The A/C unit is just humming could it be the capacitor

Take a look at the capacitor. If it is swollen, rusty, puffed up on top, or leaking it is bad. Sometimes you cannot tell by looking at it so you can test it. Using a suicide cord attach the aligator clips to the capacitor, Place the cap where if it explodes it's remains won't get on you.
TIP: (check to see if the leads are shorted to avoid any minor explosions.) Plug the cord into a 120 volt outlet for 3 seconds. This charges the cap. Tap the cap on an iron surface to discharge it. If it makes a popping sound it is good. If it does not hold a charge it is bad. Another way is to check it with an analog meter. Set the meter on the most sensitive setting. Touch the leads to the discharged cap. The needle on the meter should hop; reverse the leads and retry it should hop again. That is an indication of a cap that will hold a charge. If the needle never moves of course that is a sign the cap is bad. Also if the needle goes all the way over and stays, that is an indication the cap is shorted and therefore bad. The cap is designed to boost the power to the motor to get it going with multiple windings being powered up at once. As soon as the motor reaches running speed the cap drops out of the circuit and it takes half the power for the motor to continue running at optimum speed. This saves energy.
FYI: The old style shaded pole motors had no capacitor and so they used twice the power to do the same job.

If you need further help, reach me via phone at

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rollcutter, timer switch may not be switching on. If it is and power is present at the motor terminal, it could be the capacitor (starting capacitor). Faulty cap (open or short) will not kick start the motor to create torque and phase angle displacement with the main winding.

If however the switch ok, cap ok and still it won't run, could be the bushing or bearing at the end plate of the motor. loose bushing will not run the motor, you'll just hear a strong hummming sound.


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