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Motor humms but blades do not rotate

Motor humms in the heat pump but blades do not rotate. After about two minutes it shuts down. No ice on the coils

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Try replacing the capacitor which is the cheaper option (about $20) if still don't work replace the motor.

Posted on Jul 31, 2009

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1 Answer

Why does my PTHP. shut off and switch to electric resistance heat?


im guessing its there way of defrosting the coils , as with this type (small) its tough to defrost the coils in an efficient way , hp runs normal to within one or two degrees of setpoint , hp shuts off or reverses in low speed , back up heat comes on to complete the room heat and to generate the heat needed to defrost the coils , entire unit shuts off when set point is reached , reversing valves set for heat and wait till next cycle

now mine does something slightly different : it runs for fifteen minutes and if set point is not reached it switches to back up and reverses the coils ,leaves compressor on (low speed) , this heats the coils up and defrosts the outdoor unit , and if it runs long enough twenty minutes total time , it goes back to normal and aux heat shuts off . this drives me insane thinking how much im spending on heating the outside !! but im sure its needed to prevent ice build up on outdoor coils ,and I sure don't want that cracking with ice formations

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1 Answer

There is a loud humming coming from outside unit, the fan is not rotating.


Your question does not include what type of system you are asking about, but the assumption is that it is a heat pump. The loud humming is the compressor running by itself while the fan is off.

This is the typical way a reasonably new heat pump operates:
There is a coil temperature sensor that initiates a defrost period to eliminate the frost/ice build up on the outdoor coil. In the defrost mode, the outdoor fan shuts off and the reversing valve in the heat pump reverses the direction of refrigerant flow to warm the outdoor coil. The same coil temperature sensor senses the temperature of the external surface of the coil and tells the defrost control when the frost is gone initiating another 'reverse cycle' to put it back into heating mode. In the heating mode, the outdoor fan runs again.

If you have the heat pump installed where snow drifts accumulate, you will have a problem extracting heat from the outdoor air, and coil frosting and freezing will be exaggerated. If you have excessive ice build up due to a defosting issue, the ice can actually stop the fan from rotating, but you would hear loud bangind and rattling for hours first as the fan blades come in contact with the ice.

If you do not have drifts, but continually have an excessive amount of ice build up, either the sensor is possibly faulty or the defrost control board is faulty. The sensor's clip could easily have been knocked loose from the coil by ice and is no longer sensing coil temperature and if so the result would be the lack of defrost initiation.

Feb 13, 2015 | Heating & Cooling

1 Answer

Iced up coils


Iced up coils always means a lack of heat load on that coil. This may be due to fan failure, dirty blades on the fan or "squirrel cage", dirty air filter. If the outdoor coil in a heat pump application is iced over, possibilities are: fan failure, dirty fan blades, outdoor ambient temperature too low, or failed defrost timer or ice sensor.

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Kenmore series 90 electric dryer does not heat and shuts off after several minutes of use. Heating element is at 9 ohms, spec is 7-11.5 , thermal limit switch was open. I replaced thermal switch and...


Make sure the vent is clear.
Does the motor humm when it starts?
If it humms then the motor is bad. Make sure the rollers are not stuck or that the blower has obstructions inside.

http://www.pdxappliance.com

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My ice maker is not dumping the ice it just freezes and stays in there help


You need to replace the ice maker . It is a lot less time consuming to replace the ice maker , than to try and repair it . But , if you want to try , you have a bad thermostat , or broken gear . If the gear type , pull the cover off the ice maker , and you will see the motor running ( small gear ) , but not turning the large gear . In this case , replacing the large gear , would be the best thing , instead of replacing the whole ice maker .

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Whirlpool ice maker (626662) runs water in and freezes but will not eject ice cubes


Hello there
Here is some things for you to check ok
The motor turns the ejector blades which rotate until they contact the ice. Because the ice is frozen to the mold, it cannot be pushed out and the motor stalls. As the blades continue to press on the ice, the ice mold heater begins heating the mold. Once the ice loosens the ejector motor turns, the mold heater shuts off and the ice is pushed out.
so what i would first do is to check the mold heater to see if it is working
and if this is good than check the motor for the ejector blade and see if it is recieving power if it is have the motor itself checked to see if it is bad ok
I hope that this is very helpful for you there is still a lot more that can be checked but try these first ok
Best regards michael

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Poulan 18" Chainsaw - Motor runs fine but blade stopped spinning


Chain may be locked in the bar. Caused by low oil flow to chain. You will probably have to remove the bar and blade. Then try to rotate the sprocket, if it will not rotate you may have to replace or repair the clutch. with the blade off try starting the saw and see if it is oiling. There is a small hole in housing that oil should be visible coming out at a fairly good rate. If not you will either have to open orifice in the housing or repairing the oil pump.

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1 Answer

Freezer not doing the job


Step by step look for the obvious such as; is the condenser clean on the unit outside the box, is the condenser fan motor running, is the coil inside iced up. These are common problems with freezers.

If the coil is frosted over the problem may be related to the defrost timer. Rotate the timer as per the arrows to the defrost position to defrost. This should cause the coil to defrost. If this does defrost the coil replace the timer.

If the condenser fan motor does not rotate with the compressor running, rotate the fan blade manually, if it is the least bit tight the bearings may be dry or gummed up, oil the motor with non-detergent oil SAE-20.

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