Consider changing the transformer to get the unit to start heating again. You should also inspect the high-voltage transformer because it can also make your over-the-range Whirlpool microwave fail to heat.Ī failing transformer will have a burning smell and frequently arc. Use a multimeter to test all the diodes to determine whether one, a couple or all of them have failed. These switches engage the door and send signals to the main control telling it to start the appliance.Ī door switch/sensor that is damaged can make your microwave stop heating. But on average, Whirlpool microwaves come with 3 to 4 door switches. The number of door switches a microwave has depends on the model. Once you have identified the fuse that has blown, replace it with a new one. Use a multimeter to test each fuse for continuity. If the microwave fails to heat, it is probably because one of or all of these fuses failed. The cavity fuse, thermal protector, and thermal fuse are all designed to cut off power when the over-the-range microwave overheats. Blown Cavity Fuse, Thermal Fuse, or Thermal Protector The high-voltage diode has one of its ends attached to the high-voltage capacitor, meaning the two components work together to covert and double the current sent to the magnetron.Ī damaged capacitor will bulge, spark, or leak.īut if you don’t see any of these visual signs, use a multimeter to test whether the component can store and release charge as designed. If the diode continuity test turns out negative, get a new one for replacement. Or you can use a multimeter to test if the diode still has a continuous electrical path. If the diode burns out, the magnetron will not get the power it needs to heat food.ĭamages on the diode are visible, so it is easy to tell if the component has damages or burns. It will convert alternating current (AC) to direct current (DC). The work of a diode is to power the magnetron. If the magnetron doesn’t return a reading of 1ohm or below, get a new one for replacement. If the magnetron malfunctions, the microwave won’t be able to heat any food or drink put in the heating chamber.
If the diode is working but the over-the-range microwave isn’t heating, the magnetron has a problem. If that cup of coffee still comes out of your over-the-range microwave as cold as it was, the appliance has heating problems.Īnd here are the possible reasons why: 1. Also, it’s likely the unit is not getting power, check if the circuit breaker has tripped in the fuse box.Īlso Read: What to Do If Whirlpool Microwave Start Button isn’t Working Whirlpool Over-the-Range Microwave Not Heating The control lock could be on, so turn it off. The light bulb itself might have burned out. Replace any part that appears damaged or doesn’t have continuity. Consider replacing the main control board is some components on it are faulty.Ĭheck the diode, plate & drive motor, and cooling fan. Replace it if it fails the continuity test.Ĭheck if the breaker has tripped, and switch it back on. Use a multimeter to test the fan motor for continuity.
Also, check to see if the diode is working and replace it if it is not functional. Inspect the magnetron, and if burned out, replace it. The table below is a summary of the common issues linked to over-the-range Whirlpool microwaves and their quick fixes: Whirlpool Microwave Over The Range Troubleshooting: 4 Problems and Fixes
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