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LG RC9011B making humming noise and stopping

I've tried repairing my dryer with no luck, so far I've replaced the drain pump and motor but still having same issue. The dryer will hum and slowly spin whilst turned off but plug switch turned on. When powering up it will continue to make the hum. I choose any program and it will spin up for approx 3 seconds before halting, creating a larger humming sound and spinning the drum backwards. I have tried to do a video as will make more sense. Any suggestions would be greatly appreciated as would prefer to fix rather than send to landfill.

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Hi,

A humming motor usually indicates either a faulty motor start winding or perhaps the motor capacitor (supplier example only) may be faulty. It seems that the motor is trying to start on the run winding only and this doesn’t produce enough magnetism to start the motor rotating, therefore the hum.

The capacitor is there to increase the torque of the motor on startup if it is wired as a start capacitor or to improve the efficiency of the motor if it is wired as a run capacitor. I don’t know which it is in your dryer.

The current flowing through both windings ensure that there is sufficient magnetism produced to overcome the inertia of the motor from the at-rest position and once the motor is up to speed an internal centrifugal switch operates and disconnects the start winding from the circuit, allowing the motor to run on the run winding only.

Here’s a link to the section of the service manual that shows the resistance values of the motor windings and also the capacitor, which may help.

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Thankyou jeyeff,

I should have mentioned that the capacitor was the first thing I replaced then the motor. But I hadn't used my multimeter as was still working out how they work, and then was away for 7 months before being able to come back and start trying to fix it again. Using parents dryer when needed at the moment as was hoping to repair rather than replace

I'll get my multimeter out and check currents and get back to you.

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@James Duncan

Try using the diagnostics on p.19 of the service manual to see if that narrows down the problem or perhaps the flowchart on p.24

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Did you find out what the noise is mine has started to do it

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The service manual is available (I looked). But I’d make sure I’ve got real 220 VAC on the power in. Humming motors are usually under excessive load or are under powered. Losing 1 leg of the 220 could easily be the issue. Check the easy stuff first. Good Hunting <<<)))

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