Question about Microwave Ovens
If the microwave is working but not heating, then the magnetron is not necessariy the faulty part.
Before replacing the magnetron there is need to test the high voltage capacitor,the rectifier diode and the wiring. If all this are fine, then the control board muast also be checked.If turntable is not running check also the door switch.
The diode and capacitors can be tested using a tool with diode tester and cap meter. The capacitor must be allowed discharge before testing, or you risk to get electrocuted. Even if power is off a big electrolytic capacitor like the one on the MW can release a big discharge.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 general diagram here: Counter top.
You can also find parts and specific diagrams for most models using the link below:
Where do I find parts and diagrams?
Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed after the oven is serviced or repaired.
Posted on Sep 01, 2010
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Posted on Jan 02, 2017
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