Question about Whirlpool MH2155XP Microwave Oven

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I have model MH2155XPB and it is not heating.

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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.
Hope this helps, but if it works but no microwave, read on:

The magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 on high resistance range for short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

Posted on Nov 07, 2010

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Morphy richards oven is not heating and not cooking anything


please proceed according and fix it. God bless you

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. A regular meter with a diode checker will not work to check these diodes. You have to use a meter with a 9 volt battery or put a 9 volt battery in series with the diode to check it.
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Door Switch

If the microwave does not heat, one of the door switches might be defective. Microwave ovens normally have three door switches, if any of them fail the microwave does not turn on and does not heat. Check the switches for continuity with an Ohm meter.
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Magnetron

If the microwave oven doesn't heat the magnetron tube might have burned out. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the microwave oven is turned on when it is empty this can cause the magnetron to burn out. Once it is burned out it has to be replaced, it's not repairable.
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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.
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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. When a high voltage transformer fails it will usually arch and have a burning smell.
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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.
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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.
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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 a faulty door switch or within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.

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Mar 01, 2013 | Morphy Richards Microwave Ovens

1 Answer

10 yr old hotpoint Microwave model #RVM1325BW will not heat, vent,clock, touch pads all working.Hust no heat. If this needs to be replaced what model # should I get for the same dimensions?


I would say that your heating element has gone out. I don't know exctly what model you have, but I would guess it to be about 1.5 Cubic Ft., and a replacement would probably run somewhere around $150 to $200. There are many brands, but if I had no cost to consider, I'd probably go with a GE or Kenmore. Hope this helps.

Mar 18, 2011 | Microwave Ovens

1 Answer

I need a new heat contro plug for my fry pan. Model # 0690001


Hi.

Ihe only similar model I found was responding to 0600001 is a Presto Kitchen Kettle Plus CrockerT. Check model number wit part seller

In that case parts can be purchased here or contacting Presto

Here
Control Master® heat control with Magnetic Cord for 600001

Nov 16, 2010 | Microwave Ovens

1 Answer

Kenmore microwave model 721.80033700 won't heat


Hi,


Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Basic Microwave Oven Troubleshooting Tips

heatman101


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Jul 24, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Magnetron is out. Where can I get assembly


depending on how old this unit is the magnetron is usually covered under a warranty and should be done by a service tech

Feb 05, 2010 | Whirlpool MH2155XP Microwave Oven

1 Answer

My GE microwave, model #WES1450DM1BB; serial #SM908139U, shows


When I try and heat some food, the microwave runs but doesn't heat anything, its a model wes1450dm1bb

Mar 15, 2009 | GE XL1800 1100 Watts Microwave Oven

1 Answer

No heat


Most common causes for no heat is bad magnatron, capacitor, or diode. This should be checked by a certified technician due to high voltage. Microwaves come with a 1 yr warranty from date of purchase and in some models the warranty is longer on the maganatron. Will need to check the owners manual.

Oct 06, 2007 | Welbilt MR755T Microwave Oven

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