GE Microwave Error Code F5: Sensor Board Replacement... | appliancefaults.com

Technical Background:

The F5 error code on a GE Profile microwave typically indicates a fault in the temperature sensor circuit. The MCU (Microcontroller Unit) monitors the voltage signal from the temperature sensor. If the voltage falls outside the acceptable range, the MCU interprets it as a fault and displays the F5 error. This voltage path includes the sensor itself, the wiring harness, the sensor board (which often contains signal conditioning circuitry), and the main control board.

Symptoms:

The microwave displays an F5 error code. The microwave may not heat properly or at all. The error may appear intermittently or constantly.

Possible Causes:

Faulty sensor board
Open or shorted temperature sensor
Wiring harness issue between sensor and control board
Defective main control board
Loose connections

Solution:

1

Disconnect power to the microwave at the breaker panel.
2

Remove the microwave from the cabinet, if applicable. Access the rear panel using a 1/4-inch nut driver.
3

Locate the sensor board. It's typically near the top of the microwave cavity.
4

Disconnect the wiring harness from the sensor board. Inspect the connector for corrosion or damage.
5

Using a multimeter, test the temperature sensor for continuity and resistance. Consult the service manual for the correct resistance value at room temperature (typically around 10k ohms at 77°F).
6

If the sensor is faulty, replace it. If the sensor tests good, replace the sensor board.
7

Reassemble the microwave and restore power. Verify the F5 error is resolved.

Safety Warning:

Always disconnect power to the microwave before performing any repairs. Microwaves contain high-voltage components that can cause serious injury or death. Use proper lockout/tagout (LOTO) procedures.

Prevention:

Regularly clean the interior of the microwave to prevent food splatters from damaging the sensor or wiring. Avoid operating the microwave empty or with metal objects inside.

Expert Tip:

Some GE Profile microwaves have a service mode. To enter it, press and hold the 'Start' and '8' buttons simultaneously for 3 seconds. This may allow you to run diagnostic tests and clear error codes.

Frequently Asked Questions

•What is the typical resistance range for the temperature sensor at room temperature?

The typical resistance range for the temperature sensor at room temperature (around 77°F) is approximately 10k ohms. Consult the service manual for the exact specification for your model.

•How do I test the wiring harness between the sensor board and the main control board?

With the power disconnected, use a multimeter to check for continuity between the corresponding pins on the sensor board connector and the main control board connector. Also, check for shorts to ground.

•If replacing the sensor board doesn't fix the F5 error, what should I check next?

If replacing the sensor board doesn't resolve the issue, the main control board is likely faulty and needs to be replaced.

GE Microwave Error Code F5: Sensor Board Replacement Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical resistance range for the temperature sensor at room temperature?

•How do I test the wiring harness between the sensor board and the main control board?

•If replacing the sensor board doesn't fix the F5 error, what should I check next?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: