Question about Sub-Zero MW24 Microwave Oven

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No heat generated in microwave or convection oven mode

Everything else works fine: power, fan, timer countdown, turntable, but there is no heat being generated in either microwave or convection heating mode.

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Sounds like you either have a door switch that's not being activated, or is defective. Check the secondary (usually lower) switch first.

Another possibility could be a defective thermal cutout on the oven cavity.

Posted on Jun 12, 2016

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I just read that starting the microwave as usual and then slightly pressing in the handle (you can hear the heater(?) come on will make the heat come on. Tried it and it works. My repairman told me it needed a new magnetron ($700) but that was totally wrong. I will be trying another repairman to replace handle mechanism.

Posted on May 24, 2014

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1 Answer

My kitchenaid microwave will not heat in microwave mode. In fact the turntable starts and stops and the display blinks intermittenly. In convection oven mode everything works fine - It heats, turntabl


The magnetron is the main part that gives out microwaves to heat the food. As the convection bit is working this points towards the microwave bits.
The magnetron has a main diode, fuse and transformer to run the microwave bit, any of these could be faulty. A word of warning though, there are extremely high voltages inside microwaves, even when unplugged in the main capacitor. Also to repair this section you will need to be a fully qualified engineer to even order parts for this.
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Demo Mode The Demo Mode is ideal for learning how to use the microwave oven. When set, functions can be entered without actually turning on the magnetron. The microwave oven light will come on, the fan will run, the countdown will run very quickly in the display, and the turntable will rotate. To Turn On/Off: The microwave oven and Timer must be off. Touch and hold TIMER SET/OFF for 5 seconds until 1 tone sounds. Repeat to turn off.

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If all appears to be running as its working but just no heat. Could be issue with magnetron. You could also have loose connections to magnetron or somewhere in high voltaged as well.

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Microve turns on, but will not heat Model number is FMT148G1B2 Everything seems to work except there's no heat. Clock works, countdown timer, light, turntable, etc., just no heat.


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The cost of the magnetron is about 95% of the cost of a microwave oven. Most people don't, for this reason, replace the magnetron, they replace the whole oven which is probably what you will end up doing.

There is a possibility that the circuit that provides power to the magnetron is faulty and you need to take it apart, find the proper electrical leads and test them with a volt meter. To do this you have to remove it from its mounting and take it apart. It is a fairly lengthy process however.


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Check the door switch, when it is faulty the oven will turn on but turntable, fan and magnetron wont operate.

Regarding parts, contact the seller here to purchase parts.

You can also order from MicrowaveSvc , they also provide parts.

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This can be the magnetron power supply area, the controler for the magnetron power supply, or the main control board itself.

If the turntable is spinning, the countdown timer is working, and the fans are going, this leaves out the possiblity for a defective safety switch.

I suggest you send the microwave oven out for an estimate if it is out of warranty. I would not suggest you try to fix this yourself.


Jerry G.

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