Question about Whirlpool GH7155XHS Microwave Oven

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My unit has completely and suddenly died. Nothing works: heat, turntable, clock, light, all dead. There is power in the outlet, which tells me that there may be a breaker or fuse inside the unit that has tripped. HELP!

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There is usually a 125V, 20 AMP line fuse inside the microwave, mounted at the point where the power cord enters the back of the unit. Unfortunately, you will need to uninstall the oven (if this is an over the range model), UNPLUG it and remove the exterior case to access. The case comes off in various ways depending on manufacture and model.


Replacement parts can be ordered at any of the following websites:

searspartsdirect.com
pcappliancerepair.com
appliancepartspros.com
repairclinic.com

All these sites are reputable and offer competitive pricing, so shop and compare. The first three sites on the list also inlcude exploded view parts illustrations to assist you with locating and properly identifying any parts you may need.


If the model number you listed this question under is correct, the line fuse is connected on the wiring harness inside the unit and is listed as part of item 14 under the "Interior" parts listing (part number 815174). There is also a Thermal Cut-Out (TCO) in the High Voltage network mounted on the magnetron that, if blown, will cause the same symptoms. It is listed as item 15 under the "Magnetron and Air Flow" parts listing. The part number is 815076.

CAUTION: DO NOT under any circumstances attempt to operate or troublehsoot the microwave oven with the exterior case removed. Voltage potentials in the High Voltage network can exceed 3,000 volts. Always UNPLUG the unit when attempting any repairs.


If the line fuse is blown, you can usually purchase a box of fuses at a hardware store for less than what the manufacturer charges for a single fuse. 125V, 20AMP Ceramic Slow Blow fuses are recommended.

If you have any questions, or need additional assistance troubleshooting, please post back and let me know. I hope you find this information helpful.

NOTE: Make sure you take any resistance readings with the microwave UNPLUGGED and the component under test isolated (removed) from the circuit. These ovens can blow a fuse by simply sitting idle. This can occur from any power fluctuations, brown outs, voltage spikes, etc. Or, it could be the symptom of a component that may have failed. If you find the internal fuse blown and replace it, only to have it blow again, you have a more significant problem than a simple blown fuse.

Posted on Aug 23, 2010

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YOUR SAFETY IS PARAMOUNT!

Attempt this only if you are competent.

If your appliance has absolutely no functions at all, remove it from the mains supply, remove the case and see where the mains lead goes in to the appliance and follow the cable until you find the main fuse.
ONLY USE THE SAME TYPE AND RATING OF FUSE TO REPLACE IT.
The usual cause of this fuse failure is the door switches are contaminated or sticking. Check the door switches before putting power back on to the appliance.
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The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
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