Question about Whirlpool MH1170XS Microwave Oven

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Microwave comes on but does not heat - Whirlpool MH1170XS Microwave Oven

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  • Whirlpool Master
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This means the magnetron is either bad, is not receiving the high voltage it needs (failed diode) and/or the fuse is blown.
You can trouble shoot this yourself with the help of a cheap digital multimeter and a reading of the Chinglish instructions that come with it.
Be advised though; if the magnetron and the diode are OK you can encounter ~ 700 volts on a charged capacitor so let the unit rest unplugged overnight if you intend to poke around in it.

Posted on Oct 04, 2009

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  • Master
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Whirlpool Microwave MH1160XS not heating but lights and fan work Whirlpool says to change magnetron
Opened unit to check fuse. 20 Amp fuse checks good Magnetron has 90 Ohms across, infinite to gnd transformer primary 0.4 ohms, secondary 90 Ohms There looks to be a diode going from the HV cap to the chassis gnd that is open both ways. Any ideas?

Posted on Oct 29, 2010

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