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Oven went dark. changed two glass fuses and everything works but oven doesn't heat anything

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  • 44 Answers

A bit more info? BRAND? MODEL? AGE?
Sounds like the Magnetron might done. Checked the Thermal fuse? (should reset)

Posted on Nov 29, 2014

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Posted on Jan 02, 2017

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MicrowaveSvc
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SOURCE: microwave oven

This is usually caused by a bad door switch or loose door switch mount but other common causes of a failure to heat are:

- loose connection at the magnetron
- problem or loose conneciton on the control unit circuit board
- bad magnetron or other high voltage part

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and
disassembly information at our site, linked here on Fixya: http://tinyurl.com/yzjozk

Posted on Nov 18, 2007

MicrowaveSvc
  • 9047 Answers

SOURCE: Won't heat

Do the inside light and turntable come on when you try to cook?

Is it making any unusual noise or is it louder or quieter than normal?

Do you have the model number?

Posted on Aug 02, 2008

BIKER T
  • 909 Answers

SOURCE: Everything else works but will not heat anything.

Im assuming you dont have testing equipment. The best solution is to replace the capacitor and HV diode. Good chance that is the problem. If no heat still, replace the magnatron, definately will work correctly.(Sorry, to much to explaine otherwise relating to measurement and values). Let me know if still notright).

Posted on Sep 27, 2009

  • 8909 Answers

SOURCE: prestige cb130 all aspects of oven are working but

It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.

YOUR SAFETY IS PARAMOUNT

This is a job for a professional but if you are safety clued up, here's instruction.
Make sure the !!!!any capacitors are discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 or moving coil meter on high resistance range for short circuit, (DVM's won't show the fault!), the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

Posted on Mar 01, 2011

  • 6771 Answers

SOURCE: Electrical short /pop sound & now it doesn't heat. Everything else works. Any idea what went out.

The signs are not always evident, but from the description the magnetron has failed.

Posted on Apr 14, 2012

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Electrical short /pop sound & now it doesn't heat. Everything else works. Any idea what went out.


The signs are not always evident, but from the description the magnetron has failed.

Apr 13, 2012 | Sharp R-1491 Microwave Oven

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My ge profile spacemaker II microwave went dark, no lights of any kind and no sound or response when pressing any button. tried resetting the circuit breaker but no change


Did you check the internal fuse? Often when everything is dark the fuse that protects the microwave is blown. Take the old fuse to your local hardware store and they will have a replacement for you. Should cost less than $5.

Nov 30, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Everything else works but will not heat anything. Clock works,glass plate turns,exhaust fan runs, lights work, just no heat.


Im assuming you dont have testing equipment. The best solution is to replace the capacitor and HV diode. Good chance that is the problem. If no heat still, replace the magnatron, definately will work correctly.(Sorry, to much to explaine otherwise relating to measurement and values). Let me know if still notright).

Sep 27, 2009 | GE JVM1410 Microwave Oven

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Won't heat


Do the inside light and turntable come on when you try to cook?

Is it making any unusual noise or is it louder or quieter than normal?

Do you have the model number?

Aug 01, 2008 | Maytag MMV5207A Microwave Oven

1 Answer

No heat...


there are 2 fuses inmicrowave 1 for ac input 1 for high voltage transformer that will trigger the magnetron "for heating"

remedy;
uncrew the unit
replace fuse near the transformer this fuse.. usually enclose with plastic casing..
then test..


causes of blown fuse
improper ventilation

Feb 21, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

2 Answers

Fuse location on a KitchenAid Microwave


my kitchenaid microwave oven does not heat anymore
everything else works but it will not warm anything up

Jan 30, 2008 | KitchenAid KCMS145J Microwave Oven

2 Answers

Everything works except it doesn't heat anything


no, just 1 main fuse for everything. there are temp safety devices though, and door closed safety switches. Most likely failure though is the magnatron.

Dec 30, 2007 | Kenmore 64002 Microwave Oven

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