Question about Whirlpool GH4155XP Microwave Oven

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Microwave ahs power but doesn't heat.

I have an older model (RM278BXV) Whirlpool microwave that matches the oven. I don't want to replace it if there's a fix. Everything runs on the microwave, but it doesn't heat at all. Any idea if there's an easy fix? I think Sears keeps parts for 20 years on their stuff (Whirlpool). Thanx!

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The most common causes for a lack of heating are a bad door switch, a loose connection on the magnetron, a bad magnetron, bad connection on the control circuit board, a bad relay on the board, bad high voltage diode, or bad high voltage transformer. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your model number here: http://tinyurl.com/gv383

Posted on Sep 28, 2007

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Check the magnetron and related circuit and high voltage fuse and high voltage diodes, etc..

Posted on Sep 25, 2007

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I have a Whirlpool old model # RM278BXV-3 and it has started shutting all the way down when heating things up. Contol panel goes blank and quits heating.


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Diode The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven.

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High Voltage Capacitor If the microwave doesn't heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testing.

High Voltage Transformer If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food.

Thermal Fuse If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

Thermoprotector If the microwave doesn't heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

Main Control Board If the microwave doesn't heat the main control board may be defective. This is not common. When a microwave doesn't heat the problem is usually within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.
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Have an older model (RM278BXV) Whirlpool microwave


what is the problem with it im guessing it prob doesnt heat, if so prob need to get acess inside and check components i would recommend getting a service call as some componoents inside are still live even when unplugged,, it might require a magnetron which would be fairly expensive but if u dont wana replace it than i guess its your only option.. hope this helps

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My whirlpool SSN - xck3214685 microwave oven


It's probably the Magnetron. They usually go out.
Most older ovens have a fuse that goes out with it and shuts the unit down. A repair shop should be able to replace the Magnetron at a reasonable cost.

Sep 12, 2009 | Microwave Ovens

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