Amana Microwave Error Code F8: Power Level Sensor... | appliancefaults.com

Technical Background:

The MCU (Microcontroller Unit) monitors the power level sensor's output voltage. The sensor provides feedback to the control board about the magnetron's power output. The MCU then adjusts the power level accordingly. An F8 error code indicates the MCU is not receiving the expected signal from the power level sensor. Voltage paths typically range from 3.3V DC to 5V DC.

Symptoms:

The microwave displays the F8 error code on the control panel. The microwave may not heat food properly, or it may shut down during operation. The turntable may not rotate.

Possible Causes:

Defective power level sensor (also called magnetron monitor).
Wiring harness damage between the sensor and the control board.
Faulty control board (MCU).
Loose connection at the sensor or control board connector.
Interference from nearby electronic devices.

Solution:

1

Disconnect the microwave from the 120V AC power outlet.
2

Access the control board and locate the power level sensor connector. Typically, you will need a 1/4-inch nut driver to remove the outer case.
3

Inspect the wiring harness for any visible damage, such as cuts, pinches, or burns.
4

Use a multimeter to test the continuity of the wires between the sensor and the control board. Replace any damaged wires.
5

Check the sensor itself. Consult the service manual for the correct resistance reading. A reading outside the specified range indicates a faulty sensor that needs replacing.
6

If the wiring and sensor are good, replace the control board (MCU). Order the correct replacement part for your Amana microwave model.
7

After replacing the sensor or control board, test the microwave operation.

Safety Warning:

Always disconnect the microwave from the power outlet before performing any repairs. Microwaves contain high-voltage components that can cause serious injury or death. Lockout/Tagout (LOTO) procedures should be followed to prevent accidental power restoration during service.

Prevention:

Regularly clean the microwave interior to prevent food buildup that could affect sensor readings. Check the wiring harness periodically for damage. Ensure the microwave is not located near devices that emit strong electromagnetic interference.

Expert Tip:

Some Amana microwaves have a service mode that allows you to directly test the power level sensor. Consult the service manual for the specific key sequence to enter the service mode.

Frequently Asked Questions

•Where is the power level sensor located in the microwave?

The power level sensor is typically located near the magnetron, often attached to the waveguide.

•What is the typical resistance range I should expect from a functional power level sensor?

Consult the Amana service manual for your specific model. However, the resistance range usually falls between 1k ohm and 10k ohm.

•Can a faulty door switch cause an F8 error?

While a faulty door switch more commonly triggers a different error code, it can sometimes indirectly affect the power level sensor readings. Test door switches for continuity as part of a complete diagnosis.

Amana Microwave Error Code F8: Power Level Sensor Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the power level sensor located in the microwave?

•What is the typical resistance range I should expect from a functional power level sensor?

•Can a faulty door switch cause an F8 error?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: