Question about Microwave Ovens

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2005 combination microwave E No.H5972NOGB/01. The grill and oven functions work OK however the microwave function does not. If you start to heat some water after 20 seconds it switches to off and cools the oven. The water is not heated at all for the 20 seconds it does run for. Colin

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  • colinwdick Jul 14, 2009

    Is there nothing else that I can try, I have checked and there is no hook, there is however a switching mechanism that tells the microwave that the door is closed but i dont suspect this to be at fault as the grill and oven work fine.



    It cant be the thermal switch as the oven and grill still work fine.

  • colinwdick Jul 14, 2009

    got no reply from the last 'expert'

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  • Microwave Ovens Master
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If the grill and oven functions work OK however the microwave function does not heat, then test the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.

The diode and Capacitor can be tested. To test the diode and cap you must use a multimeter with capacitance reading and diode tester , see: How to Test a Capacitor.and Testing Diode-How to test.
Testing them with a basic multimeter can still be done, but it is quite complicate, particularly with the capacitor.

The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off.
Capacitors can get discharged by shorting their two contacts.
Before replacing the magnetron test also the control board.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person and a microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, you can contact the seller here to purchase parts.

If my comment had been helpful, please do not forget to rate the solution afterward.

Thanks.

G.

Posted on Jul 14, 2009

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  • Master
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If the power is on, but it does not work check to make sure the door closes and aligns properly. Microwave door switches have metal terminals on the end that make contact with the door hook or latch. This completes the circuit which allows the microwave oven to run and without this contact the microwave will not operate. A simple misalignment might be breaking the circuit causing the microwave not to operate.

If you suspect that the thermal fuse has blown, call a professional appliance repair person. Even an unplugged microwave oven can kill or seriously injure someone. This is because there is a high energy capacitor inside the microwave oven case. If it is not discharged properly, you could be electrocuted.

If your microwave buzzes or hums but does not produce any heat, it could be a faulty defective diode, triode, high-voltage capacitor, or even a faulty magnetron. However, this problem usually means a bad means a bad magnetron, followed by a bad diode. Call a professional appliance repair person for assistance.

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Posted on Jul 14, 2009

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