The microwave / convection oven was purchased new in 2011. Everything works properly as far as heating and turning are concerned. However – when it is OFF and the door is closed it hums. The display works, the thermal cut-off is good, the magnetron gives a good reading – the transformer gives me 120v across and the capacitor tests ok. The door switch shuts off when opened. This happened once before – I replaced the magnetron but it did not change anything. I put the old magnetron back in and for some reason a few days later it started working and has worked for about a year – until a few days ago when it started the same symptom. I still have the replacement magnetron which I have swapped out, but the result is the same. I have been unable to find anything on the web with the same symptom – there is no grind and the turntable works great. As long as we leave the door open when it is off there is no problem, and when we put food in and turn it on it works properly. We are just afraid if we leave the door closed something will catch fire.
- Larry Gutman asked 10 years ago
Larry, 95% of the time when we get customer complaints on humming when the unit is off it is coming from the transformer. I would replace the transformer. Matt Ace technician
- AV Repair Help answered 10 years ago
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There are door switches. One of the door switches could be bad. Verifying where the humming is coming from is key.
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I meant to say there are 3 door switches. One of them could be sticking which could cause the turntable motor or the fan to stay on.
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