GE Microwave Error Codes

Complete GE Microwave Guide

This guide explains all GE Microwave error codes (CH series) with simple troubleshooting steps to help you identify and fix common issues safely before calling a technician.

F1
Touchpad Shorted
  • Disconnect microwave power for 5 minutes.
  • Clean keypad surface thoroughly.
  • Inspect ribbon cable connection.
  • Replace touchpad if buttons remain stuck.
SE
Keypad Communication Error
  • Check keypad ribbon cable connection.
  • Inspect control board for corrosion.
  • Restart microwave after power reset.
  • Replace keypad or control board if needed.
F2
Overheat Protection Triggered
  • Turn off microwave immediately.
  • Allow unit to cool completely.
  • Check cooling fan operation.
  • Inspect airflow vents for blockage.
F3
Humidity Sensor Error
  • Inspect humidity sensor wiring.
  • Clean sensor area inside cavity.
  • Check connector for corrosion.
  • Replace faulty sensor if readings are incorrect.
F4
Humidity Sensor Circuit Open
  • Inspect sensor wiring for breaks.
  • Test sensor continuity with multimeter.
  • Reconnect loose wiring harness.
  • Replace sensor if circuit remains open.
F5
Door Not Closing Properly
  • Ensure door is fully closed and latched.
  • Inspect door switch alignment.
  • Check for debris in latch area.
  • Replace door switch if defective.
F6
Relay Control Failure
  • Disconnect microwave power supply.
  • Inspect relay contacts on control board.
  • Check for burned or damaged components.
  • Replace control board if relay is faulty.
F7
Power Supply Instability
  • Check outlet and circuit breaker condition.
  • Avoid using extension cords.
  • Test microwave on a stable power source.
  • Contact electrician if voltage fluctuates.
F8
Cooling Fan Failure
  • Check if cooling fan is spinning.
  • Inspect fan motor wiring connections.
  • Remove dust buildup around fan.
  • Replace fan motor if not operating.
F9
Control Board Memory Error
  • Disconnect power for 10 minutes.
  • Inspect control board for moisture damage.
  • Check wiring connections to PCB.
  • Replace main control board if error persists.
F10
Magnetron Failure
  • Stop using microwave immediately.
  • Check high-voltage components.
  • Inspect magnetron connections.
  • Replace magnetron if defective.
F11
High Voltage Transformer Fault
  • Disconnect power supply.
  • Inspect transformer for burn marks.
  • Check wiring and capacitor condition.
  • Replace transformer if faulty.
F12
Turntable Motor Failure
  • Check turntable rotation manually.
  • Inspect motor coupling underneath.
  • Test motor wiring connection.
  • Replace motor if not rotating.
F13
Inverter Circuit Fault
  • Reset microwave power supply.
  • Inspect inverter board for damage.
  • Check high-voltage wiring.
  • Replace inverter PCB if needed.
F14
Temperature Sensor Failure
  • Check sensor resistance values.
  • Inspect wiring harness for damage.
  • Verify sensor placement in cavity.
  • Replace sensor if readings are incorrect.
F15
General System Error
  • Perform full power reset.
  • Check all wiring connections.
  • Inspect control board for faults.
  • Replace PCB if error persists.
F16
Door Interlock Switch Fault
  • Check door latch alignment.
  • Inspect interlock switch mechanism.
  • Test switch continuity with multimeter.
  • Replace door switch assembly if faulty.
F17
Humidity Sensor Drift
  • Clean sensor area inside cavity.
  • Check for grease or moisture buildup.
  • Test sensor resistance values.
  • Replace sensor if readings are unstable.
F18
Touch Panel Communication Loss
  • Disconnect power for 5–10 minutes.
  • Check ribbon cable connection.
  • Inspect control board for corrosion.
  • Replace keypad or PCB if needed.
F19
Grill Heater Failure
  • Check grill element continuity.
  • Inspect wiring connections for burns.
  • Test heating relay operation.
  • Replace grill heater if defective.
F20
Low Voltage Detection
  • Check household power supply.
  • Avoid using extension cords.
  • Test microwave on stable outlet.
  • Use voltage stabilizer if needed.
F21 / E21
Magnetron Overheat Protection
  • Allow microwave to cool completely.
  • Check ventilation fan operation.
  • Inspect airflow vents for blockage.
  • Replace magnetron if overheating continues.
F22
High Voltage Diode Failure
  • Disconnect power immediately.
  • Inspect high-voltage diode condition.
  • Check capacitor and transformer health.
  • Replace diode if shorted or open.
F23
Microwave Inverter Overload
  • Reset power supply for 10 minutes.
  • Check inverter board for burn marks.
  • Inspect magnetron load condition.
  • Replace inverter PCB if faulty.
F24
Fan Motor Speed Error
  • Check cooling fan for obstruction.
  • Inspect motor wiring connection.
  • Test fan rotation manually.
  • Replace fan motor if unstable.
F25
Internal Fuse Blown
  • Disconnect microwave from power.
  • Inspect internal fuse condition.
  • Check for shorted components.
  • Replace fuse after fixing root cause.
F26
Control Panel Moisture Damage
  • Dry control panel completely.
  • Inspect keypad for water intrusion.
  • Check ribbon cable corrosion.
  • Replace panel if unresponsive.
F27
Relay Stuck ON
  • Disconnect power immediately.
  • Inspect relay contacts on PCB.
  • Check for burnt control board traces.
  • Replace control board if relay is stuck.
F28
Sensor Calibration Error
  • Reset microwave to factory settings.
  • Inspect sensor mounting position.
  • Check firmware or control logic.
  • Replace sensor if calibration fails.
F29
General Communication Failure
  • Power cycle microwave for 10 minutes.
  • Inspect wiring harness connections.
  • Check PCB for corrosion or damage.
  • Replace main board if issue persists.

Frequently Asked Questions


Why is my GE microwave not heating food?
Check if the microwave is in proper cooking mode and power level is set correctly. Inspect the door latch, as the unit will not heat if the door switch is faulty. If the issue persists, the magnetron may need inspection.
Why is my GE microwave not turning on?
Check the power outlet and circuit breaker. Ensure the door is fully closed, and test the microwave on a different outlet. If there is still no power, inspect the internal fuse.
Why is my GE microwave sparking inside?
Remove any metal objects or foil from inside. Clean the interior cavity, including waveguide cover, and check for burnt food debris. If sparking continues, inspect the waveguide cover or diode.
Why does my GE microwave shut off during cooking?
Check for overheating due to blocked vents or long cooking cycles. Ensure proper airflow around the unit. Allow it to cool before restarting.
Why is my GE microwave door not opening?
Check if the latch mechanism is stuck or damaged. Gently press and release the door. If the issue persists, inspect the door interlock switch.
Why is my GE microwave making loud humming noise?
Inspect the magnetron and high-voltage components. A faulty capacitor or diode may also cause humming. If noise is excessive, stop use and inspect internally.
Why is my GE microwave display not working?
Check power supply and reset the unit. Inspect the control board and ribbon cable connections. If the display remains blank, the control panel may need replacement.
Why is my GE microwave keypad not responding?
Clean the keypad surface and ensure it is not locked. Check ribbon cable connection between keypad and control board. Replace touchpad if buttons remain unresponsive.
Why is my GE microwave turning on by itself?
Inspect the control panel for moisture or stuck buttons. Reset the microwave by unplugging it for several minutes. If issue continues, the control board may be faulty.
How do I reset my GE microwave?
Unplug the microwave from the power source for 5–10 minutes. Plug it back in and reset the clock. Test operation with a short heating cycle.
Important: If the error code continues after troubleshooting, disconnect power immediately and contact a certified GE technician.