GE Microwave Error Code F2: NTC Sensor Resistance... | appliancefaults.com

Technical Background:

The F2 error code on a GE microwave typically indicates a problem with the NTC (Negative Temperature Coefficient) sensor. This sensor monitors the temperature inside the oven cavity and sends a voltage signal to the main control board (MCU). The MCU interprets this signal to regulate heating. If the MCU detects an abnormal voltage or resistance from the NTC sensor, it triggers the F2 error to prevent overheating or damage.

Symptoms:

The GE microwave displays an F2 error code and will not operate. The oven may not heat properly, or the error appears intermittently.

Possible Causes:

Failed NTC sensor
Loose wiring connection to the NTC sensor
Damaged wiring harness leading to the main control board
Defective main control board (MCU) not reading the sensor properly
Excessive moisture or grease buildup affecting sensor reading

Solution:

1

Disconnect power to the microwave at the breaker panel.
2

Locate the NTC sensor inside the oven cavity, typically near the top or side. It's usually held in place by a screw or clip.
3

Using a multimeter set to ohms, disconnect the sensor and measure its resistance at room temperature (around 70-75°F).
4

Compare the measured resistance value to the manufacturer's specifications (usually found in the service manual or online). Typically, it should be around 50k ohms at room temperature.
5

Inspect the wiring and connectors leading to the NTC sensor for any damage, corrosion, or loose connections. Repair or replace as needed.
6

If the sensor tests out of range, replace the NTC sensor with a new one. Ensure the replacement is the correct part number.
7

If the wiring and sensor are good, consider replacing the main control board, as it may be failing to interpret the sensor's signal correctly.

Safety Warning:

Always disconnect power to the microwave at the breaker panel before performing any repairs. Microwave ovens contain high-voltage components that can cause serious injury or death. Lock Out/Tag Out (LOTO) procedures should be followed.

Prevention:

Regularly clean the interior of the microwave to prevent grease and food buildup, which can affect the NTC sensor's performance. Inspect the sensor periodically for any signs of damage or corrosion.

Expert Tip:

Some GE microwaves have a service mode that allows you to directly read the NTC sensor values. Consult the service manual for the specific key sequence to enter service mode and check the live temperature readings. This can help confirm whether the sensor is providing accurate data.

Frequently Asked Questions

•Where can I find the technical specifications for the NTC sensor resistance?

The technical specifications for the NTC sensor resistance are usually found in the service manual for your specific GE microwave model. You can often find these manuals online through appliance parts retailers or the GE Appliances website. Search by your model number to find the correct manual.

•How do I access the main control board in my GE microwave?

Accessing the main control board typically involves removing the microwave's outer cabinet. First, disconnect the power. Then, usually, there are screws on the back or sides of the microwave that secure the cabinet. Once removed, you should be able to locate the main control board. Be careful when handling the board, as it contains sensitive electronic components.

•If the NTC sensor seems fine, what else could cause an intermittent F2 error?

An intermittent F2 error, even with a good NTC sensor, could be caused by a poor connection in the wiring harness between the sensor and the main control board. Also check for intermittent power supply issues at the breaker panel that could be affecting the MCU operation.

GE Microwave Error Code F2: NTC Sensor Resistance Testing Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where can I find the technical specifications for the NTC sensor resistance?

•How do I access the main control board in my GE microwave?

•If the NTC sensor seems fine, what else could cause an intermittent F2 error?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: