How To Fix Microwaves That Aren’t Heating
High-Voltage Diode
If your microwave does not heat, the rectifier or high-voltage diode is malfunctioning. This component supplies the magnetron with high voltage. You will need to remove the cabinet to access the high-voltage diode, which is located near both the magnetron capacitor and the high-voltage diode. Disconnect the power and discharge the high-voltage capacitor to avoid an electrical shock. Then, you can use a multimeter to check the diode’s continuity. The resistance of diodes is polarity-specific. You will see a lower resistance when the meter’s leads are in one position. Most multimeters are equipped with unique settings to measure diodes or rectifiers. It needs to be replaced if the high-voltage diode has low resistance or no continuity in either direction. You’ll then need to test whether the circuit is receiving power. Further testing of this circuit should only be done by qualified technicians.
Door Switch
You may need to replace the door switch if your microwave doesn’t heat. Door switches (also known as interlock switches) provide power to various components of the microwave when it is closed and cut power when it is opened. It is possible for the magnetron not to work when the interlock switch fails. The fan motor or stirrer may still operate. Interlock switches are inside the cabinet. They are activated via hooks and latches. Remove the cabinet and unplug the unit. Wires will be attached to the terminals of interlock switches marked as common (C) or normally open (NO). Multimeters can be used to check the switches’ continuity. You should be able to see continuity between the terminals when you press the actuator button. The switch must be replaced if there is no continuity. Verify that the door hooks engage the switch actuator properly when the door closes and make any necessary adjustments.
Magnetron
Magnetrons can be the cause of a microwave not heating. This component is a part of the high-voltage circuit, generating the microwaves that produce heat. The unit could blow a fuse if the magnetron fails, but all other functions may work typically. The cabinet must be removed to access the magnetron. Disconnect the power and discharge your high-voltage capacitor to prevent an electric shock. The magnetron can be located, and the wires can be removed. Connect a multimeter’s leads to the magnetron’s terminals and test for continuity. The resistance between the terminals should only be 2 to 3 ohms. The magnetron must be replaced if there is no continuity. Check for continuity between the two terminals of the magnetron and its grounded outer casing. The magnetron must be replaced if there is continuity between the terminals and the ground. If continuity tests do not reveal any faults, live voltage testing may be necessary. A qualified individual should do this.
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