Question about Bosch HMT8656GB Microwave Oven

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Hi, we have a Bosch HMT8656GB built-in microwave, and the other night (shortly after microwaving several potatoes), it shorted out and tripped the main fuse for the kitchen sockets. We've isolated it to the microwave, but every time we plug it back in, the fuse trips immediately. Can this be repaired, or are we best off getting a new one? Thank you!

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  • Joel Friedenberg May 09, 2014

    Take a look inside the unit. Posiibly you'll find a hot wire grounded. The unit has a 10 amp fuse inside I beleive, so if the unit is shorting it must be a problem before the fuse . That's if the fuse is blown. Did you check the power cord?



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If the power Circuit Breaker is tripping, then it is not necessarily be the LV nor the HV circuitry that is the culprit.. It could possibly be an Earth leakage. I suggest check the Carousel Motor for Earth leakage. (also the Fan motor). The Power Fuse (in the MW) ought to blow if there is a problem with the LV or HV circuit.
Otherwise, the Inverter Board need to be repaired or replaced.

Posted on Oct 07, 2014

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Confirm that the receptacle where the microwave is plugged in is not faulty by plugging something else in the recepticle and seeing if it works or if the fuse blows. Check the power cord of the microwave for broken, frayed wires. Also check the bulb socket for broken wires. It may or may not be worth the cost of repair, depending on the repair cost verses a new microwave. There are repair parts available.

Posted on May 08, 2014

  • Amanda Hayes
    Amanda Hayes May 08, 2014

    Sorry, should have added - I've had an electrician in, and he confirms that the power point is working fine - so it's definitely the microwave! Is there an easy way to figure out what caused the short, or is there a likely culprit we could look for?



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SOURCE: Hi there, I have a

This indicates one of three things, there is a short in the magnetron, or high voltage diode , or the high voltage capacitor. Now! the other possible situation is the door switch has become defective and this would apply when you first plug in the microwave oven, either way it needs to be checked and depending on parts and labor the cost could come close to a replacement.

Posted on Feb 28, 2011

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SOURCE: Bosch microwave & exhaust fan trip fuse when on at the same time as the gas stove.

see the next steps: use the common sense and VOM
1. No power to outlet (overload or fault in microwave or other appliance).
2. Blown main fuse - likely due to other problems.
3. Open thermal protector or thermal fuse.microfuse.jpg
4. Defective controller or its power supply.
5. Clock needs to be set before other functions will operate (some models).

Posted on Aug 01, 2012

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Attempt this only if you are competent.

But here is a basic method if you are mechanically minded and have electrical safety knowledge.

I am assuming the plastic coupler is not split or broken and causing the problem.

The motor assembly is fixed to the base of the oven usually with two screws and access is obtained usually by removing the inspection plate directly beneath the motor. It is usually a plug in synchronous motor that revolves at a few revs per minute but the plastic cogs in the motors gear box fail and the motor assembly must be replaced. They are fairly inexpensive and obtainable usually from a domestic appliance repair shop.
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Trained technicians can help the mfg improve their products if they find the problem and report it to the Mfg.

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