GE Microwave Error Code F1: Open Thermal Sensor... | appliancefaults.com

Technical Background:

The MCU (Microcontroller Unit) on the control board monitors the thermal sensor's resistance. The sensor provides feedback on the microwave's internal temperature. An open circuit (high resistance) triggers the F1 fault code, indicating the sensor is not providing a valid temperature reading. The MCU then shuts down the microwave to prevent damage from overheating. The sensor typically operates with a 5V DC signal.

Symptoms:

The microwave displays an F1 error code on the control panel and will not operate. The error may appear intermittently or constantly.

Possible Causes:

Overheating due to prolonged use or blocked ventilation.
Faulty thermal sensor.
Wiring harness issue between the sensor and the control board.
Defective control board.
Stuck or shorted relay on the control board powering the magnetron.

Solution:

1

Disconnect the microwave from the 120V AC outlet and verify with a multimeter.
2

Locate the thermal sensor (usually on the magnetron or cooking cavity). Use a 1/4-inch nut driver to remove any mounting screws.
3

Disconnect the wires from the thermal sensor. Inspect the wiring and connector for damage or corrosion.
4

Using a multimeter, test the thermal sensor for continuity. An open circuit indicates a faulty sensor and it must be replaced.
5

If the sensor checks out, inspect the wiring harness between the sensor and the control board for continuity and shorts. Replace if needed.
6

If the wiring is good, the control board may be faulty. Visually inspect the board for burned components.
7

Replace the thermal sensor or control board as needed. Reassemble the microwave and test its operation.

Safety Warning:

Disconnect the microwave from the power source before attempting any repairs. Microwaves contain high-voltage components that can cause serious injury or death. Lock-out/Tag-out (LOTO) procedures must be followed.

Prevention:

Ensure proper ventilation around the microwave. Avoid continuous use for extended periods. Clean the interior regularly to prevent food buildup that can cause overheating.

Expert Tip:

Some GE microwaves have a service mode. Entering the service mode allows you to test individual components. Consult the service manual for the specific model for instructions on how to enter service mode and run diagnostics.

Frequently Asked Questions

•How do I locate the thermal sensor in my GE microwave?

The thermal sensor is typically located on the magnetron or the cooking cavity. It's a small component with two wires connected to it. Refer to your microwave's service manual for the exact location.

•What type of thermal sensor should I use as a replacement?

Use the exact replacement thermal sensor specified for your GE microwave model. Using an incorrect sensor can lead to improper operation or damage.

•Can a faulty door switch cause an F1 error code?

While a faulty door switch can cause other problems, the F1 error is specifically related to the thermal sensor circuit. A door switch issue usually presents with different symptoms, such as the microwave not turning on or continuing to run when the door is opened.

GE Microwave Error Code F1: Open Thermal Sensor Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•How do I locate the thermal sensor in my GE microwave?

•What type of thermal sensor should I use as a replacement?

•Can a faulty door switch cause an F1 error code?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: