KitchenAid Microwave Error Codes

Complete KitchenAid Microwave Guide

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

F1
Touch Panel Shorted
  • Disconnect power for 5–10 minutes.
  • Clean control panel surface from moisture or grease.
  • Inspect ribbon cable connection.
  • Replace touch panel if short persists.
F2
Overheating Detected
  • Allow microwave to cool completely.
  • Check ventilation openings for blockage.
  • Inspect thermal sensor or thermostat.
  • Replace thermal cutoff if needed.
F3
Humidity Sensor Failure
  • Inspect sensor wiring connections.
  • Check for moisture or corrosion damage.
  • Test sensor resistance with multimeter.
  • Replace humidity sensor if faulty.
F4
Door Switch Fault
  • Check door alignment and latch.
  • Inspect interlock switches for damage.
  • Test continuity of door switch system.
  • Replace switch assembly if needed.
F5
Relay Control Failure
  • Reset microwave power supply.
  • Inspect control board relay circuit.
  • Check wiring to high-voltage components.
  • Replace control board if relay is faulty.
F6
High Voltage Transformer Fault
  • Check transformer for overheating or damage.
  • Inspect wiring connections.
  • Test high-voltage circuit components.
  • Replace transformer if faulty.
F7
Magnetron Failure
  • Check magnetron for burning smell or damage.
  • Inspect high-voltage capacitor.
  • Test diode and transformer output.
  • Replace magnetron if defective.
F8
Cooling Fan Failure
  • Inspect fan motor and blades.
  • Check for obstruction or dust buildup.
  • Test fan power supply.
  • Replace fan motor if needed.
F9
Inverter Board Error
  • Reset microwave power cycle.
  • Inspect inverter board connections.
  • Check for burnt components.
  • Replace inverter board if faulty.
F10
Turntable Motor Failure
  • Check turntable motor for obstruction.
  • Inspect gear alignment.
  • Test motor resistance.
  • Replace motor if not rotating.
F11
Power Supply Instability
  • Check outlet voltage stability.
  • Inspect power cord for damage.
  • Reset circuit breaker.
  • Contact electrician if issue persists.
F21 / E21
Motor Failure / Drive Jam
  • Check turntable motor for blockage.
  • Inspect drive mechanism.
  • Remove internal obstructions.
  • Replace motor if needed.
F12
Keypad Communication Failure
  • Check ribbon cable between keypad and control board.
  • Inspect for loose or corroded connectors.
  • Reset power to the unit.
  • Replace keypad assembly if issue persists.
F13
Control Board Memory Error
  • Perform full power reset for 10 minutes.
  • Check for voltage fluctuations.
  • Inspect main PCB for damage.
  • Replace control board if memory fails.
F14
Excessive Internal Humidity
  • Allow microwave to dry completely.
  • Check ventilation system.
  • Inspect steam vent and seals.
  • Replace humidity sensor if needed.
F15
Thermal Fuse Open Circuit
  • Check thermal fuse continuity.
  • Inspect overheating history.
  • Check airflow restrictions.
  • Replace thermal fuse if blown.
F16
Door Latch Misalignment
  • Inspect door hinges and alignment.
  • Check latch hook condition.
  • Ensure door closes firmly.
  • Replace latch assembly if damaged.
F17
Cooking Sensor Calibration Error
  • Reset microwave calibration mode.
  • Clean sensor area inside cavity.
  • Test sensor response.
  • Replace sensor if inaccurate.
F18
High Voltage Diode Failure
  • Inspect high-voltage diode for burn marks.
  • Test diode with multimeter.
  • Check capacitor and transformer condition.
  • Replace diode if faulty.
F19
Low Power Output Issue
  • Check magnetron performance.
  • Inspect inverter or transformer system.
  • Test power supply stability.
  • Replace magnetron if weak output detected.
F20
Stuck Relay on Control Board
  • Reset power to release relay lock.
  • Inspect relay contacts for welding.
  • Check control board for overheating.
  • Replace PCB if relay is stuck.
F22 / E22
Cooling System Airflow Restriction
  • Clean air vents and fan housing.
  • Check cooling fan operation.
  • Remove dust buildup inside unit.
  • Replace fan motor if airflow is weak.
F23 / E23
Voltage Surge Protection Triggered
  • Unplug microwave and wait 10 minutes.
  • Check household power stability.
  • Inspect surge protection components.
  • Replace control board if damaged.
F24 / E24
Door Interlock System Failure
  • Inspect all door interlock switches.
  • Check wiring harness to door assembly.
  • Test continuity of safety switches.
  • Replace interlock system if faulty.

Frequently Asked Questions


Why does my KitchenAid microwave not respond?
Check power supply, control lock status, and system connection. Ensure the unit is properly plugged in and reset the microwave system.
Why is my KitchenAid microwave not starting?
Check door switch and power supply. Ensure the door is fully closed and control panel is responsive. Reset the system if needed.
Why is my KitchenAid microwave not heating food properly?
Check magnetron, high-voltage diode, and capacitor. Ensure proper voltage supply and reset the microwave system.
Why is my KitchenAid microwave not heating at all?
Inspect magnetron, transformer, and thermal fuse. Ensure door switches are working correctly and power supply is stable.
Why is my KitchenAid microwave making unusual noises?
Inspect cooling fan, turntable motor, and internal components. Remove any debris inside the microwave cavity.
Why does my KitchenAid microwave stop mid-cycle?
Check overheating protection, door switch, and power interruptions. Allow the unit to cool before restarting.
Why is my KitchenAid microwave taking too long to heat food?
Check magnetron performance, power level settings, and voltage supply. Ensure proper ventilation and no internal obstruction.
Why is my KitchenAid microwave burning or overheating food?
Check sensor calibration, power level settings, and cooking time configuration. Clean sensor area inside cavity.
Why is my KitchenAid microwave display not working?
Check power connection, control board, and display wiring. Restart system and inspect control panel.
Why is my KitchenAid microwave showing an error code?
Note the error code displayed. Reset the microwave and inspect sensors, wiring, or control board if needed.
Why is my KitchenAid microwave turntable not spinning?
Check turntable motor, roller ring, and coupling. Remove any obstruction and ensure proper alignment.
How do I reset my KitchenAid microwave system messages?
Turn off power for 5–10 minutes, then restore power to reset system errors and clear temporary faults.
Important: Microwave repairs involve high voltage components. If the issue persists, contact a certified KitchenAid technician.