GO
SEARCH:

Whirlpool Microwave Doesn't Heat

MT4155SPB/4

The 7 most common part(s) or condition(s) which cause the symptom Microwave doesn't heat are listed below starting with the most likely. Check or test each item and watch any available videos.

Grid is 1 inch square
Diode - Part # 1522339 Mfg Part # 6851W1A002E

Diode

RepairClinic Item # 1522339

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.

$3.70

Order now and this item will ship out Tuesday

Add to Cart

365 Day Return Policy

Grid is 1 inch square
Magnetron - Part # 1372516 Mfg Part # 6324W1A001H

Magnetron

RepairClinic Item # 1372516

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.

$60.80

Order now and this item will ship out Tuesday

Add to Cart

365 Day Return Policy

Grid is 1 inch square
High Voltage Capacitor - Part # 1271743 Mfg Part # 0CZZW1H004C

High Voltage Capacitor

RepairClinic Item # 1271743

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.

$16.90

Order now and this item will ship out Tuesday

Add to Cart

365 Day Return Policy

Grid is 1 inch square
High Voltage Transformer - Part # 1349820 Mfg Part # 6170W1D077J

High Voltage Transformer

RepairClinic Item # 1349820

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.

$66.25

Order now and this item will ship out Tuesday

Add to Cart

365 Day Return Policy

Grid is 1 inch square
High Voltage Transformer - Part # 1521103 Mfg Part # 6170W1D052U

High Voltage Transformer

RepairClinic Item # 1521103

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.

$69.50

Order now and this item will ship out Tuesday

Add to Cart

365 Day Return Policy

Picture Unavailable

Main Control Board

RepairClinic Item # 1363718

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.

Picture Unavailable

Main Control Board

RepairClinic Item # 1377767

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.

Back to Symptom List