Question about Whirlpool GH7155XHS Microwave Oven

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Whirlpool Gold 609TAKK14309 69-69E04320-014309 Timer and light work - nothing else

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  • jackierfb Jun 04, 2010

    yes, very much - thanks



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Hello Jackierfb

Depending on your technical skills , there are basically 4 components which you can check than normally cause this type of error in a microwave.


Firstly , check to see if your microwave is fitted with a fuse. This will normally be located inside the casing and it is not very common for a microwave to have a fuse , so don't worry if you can't find one. If you are in doubt , let me know and I will look up to see if there is a fuse for you to check. The fact that the timer and the light is still working means that it's probably not the fuse anyway , so let's continue.

Open the casing of you microwave and look at the back right of the unit for the following.

HV Diode is located near the power supply and is identified with a symbol like in the picture below.


Check the diode for physical damage like a crack , bulge , burst or burned smell as they normally fail physically. To test , set a multimeter to test resistance at 10k ohms and test. A normal diode should read 50-200 k ohms. If not , replace the diode as it has gone. Remember that the polarity is important , so test it both ways (or put positive to anode of diode)

Next component to check is the HV Filter Capacitor. This component is a big circular steel tube on the board/mounted near the HV diode.
Locate and remove any leads going to the capacitor AFTER DISCHARGING THE CAPACITOR.

Now , set you multimeter to resistance again to the highest available setting. Now put it onto the terminals for a few moments (Should read infinite) and then switch the leads around. The reading should go to almost zero and then go back to infinite. Also test between each terminal and the casing (if not covered in plastic) and this reading should be also be infinity. This test might not work if your multimeter is digital and has a very high latency. If it's a good quality multimeter , it should work fine.

Also inspect the capacitor for bulges , leaking , a strong burnt smell or a crack and replace if any of the test fail. These capacitors are designed to fail at the top of the capacitor where steel is visible , so check here especially.

If neither the Diode or the Capacitor is defective , by process of illimination , the only thing left is the Magnetron. Depending on how expensive your oven was it may not be worth replacing as it's a expensive component. In your case , it would cost about $75-$150 for the magnetron , so you might just want to buy a new oven.

Most of these components can be found at radio shack (diode and capacitor) or If not , contact Whirlpool directly.

Feel free to ask if you need more info or have any questions.

Kind Regards

Posted on Jun 04, 2010

  • Stephan Reichert
    Stephan Reichert Jun 04, 2010

    It's a pleasure. Please do not hesitate to ask my if you get stuck or need some advice doing any of the steps.

    Kind Regards



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