Admiral Microwave Exhaust Fan Weak and Not Pulling... | appliancefaults.com

Technical Background:

The microwave's exhaust fan is controlled by the main control unit (MCU). When the user activates the fan, the MCU sends a signal to a relay, which then provides 120V AC power to the fan motor. A thermistor might be present, slowing down the fan until the unit reaches a specific temperature. A malfunctioning relay or a fault in the wiring can disrupt the voltage path to the motor.

Symptoms:

The Admiral microwave exhaust fan is operating at a reduced speed, failing to effectively remove smoke and odors from the cooking area. The fan may sound weak or strained.

Possible Causes:

Clogged or Dirty Grease Filter
Faulty Exhaust Fan Motor
Blocked Exhaust Duct
Defective Motor Control Relay
Low Voltage Supply to Motor

Solution:

1

Disconnect the microwave from the power outlet.
2

Remove and thoroughly clean the grease filter with hot, soapy water. Replace if damaged.
3

Inspect the exhaust duct for any obstructions. Clear any blockages.
4

Use a multimeter to test the voltage at the exhaust fan motor. You should read approximately 120V AC when the fan is activated.
5

If voltage is present but the fan is weak, the fan motor is likely defective. Replace the motor. Use a 1/4-inch nut driver to remove mounting screws.
6

If voltage is absent, check the motor control relay on the control board. A faulty relay will need to be replaced.
7

Reassemble the microwave and test the exhaust fan function.

Safety Warning:

Always disconnect the microwave from the power source before performing any repairs. High voltage components are present inside the unit. Lock-Out/Tag-Out (LOTO) procedures should be followed to prevent accidental energization during service.

Prevention:

Regularly clean the grease filter every month to prevent buildup. Inspect the exhaust duct annually for any obstructions. Avoid using the microwave for extended periods with excessive heat, as this can stress the fan motor.

Expert Tip:

Some Admiral microwave models have a service mode that allows you to directly activate the exhaust fan for testing purposes. Consult the service manual for the specific key sequence to enter service mode for your model.

Frequently Asked Questions

•How do I access the exhaust fan motor on my Admiral microwave?

Typically, you'll need to remove the microwave's outer casing. This usually involves removing screws from the rear and sides. Once the casing is off, the exhaust fan motor should be visible and accessible. Refer to the service manual for your specific model for detailed instructions.

•What type of replacement exhaust fan motor do I need?

You'll need to identify the correct replacement motor for your specific Admiral microwave model. The motor will have a part number printed on it. You can also use the microwave's model number to search for compatible replacement parts online or at appliance parts stores.

•How can I test the motor control relay?

After disconnecting power and safely accessing the control board, use a multimeter to test the relay for continuity. When the relay is activated (simulating the exhaust fan being turned on), there should be continuity between the appropriate terminals. If there is no continuity, the relay is likely defective.

Admiral Microwave Exhaust Fan Weak and Not Pulling Smoke: Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I access the exhaust fan motor on my Admiral microwave?

•What type of replacement exhaust fan motor do I need?

•How can I test the motor control relay?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: