Whirlpool Microwave Error Codes

Complete Microwave Dryer Guide

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

F1
Touchpad / Control Board Failure
  • Disconnect power for 5 minutes.
  • Inspect control board for burn marks or damage.
  • Check ribbon cable connection.
  • Replace control board if necessary.
F2
Keypad Shorted / Stuck Button
  • Clean keypad surface thoroughly.
  • Check for stuck or damaged buttons.
  • Inspect membrane keypad connection.
  • Replace keypad assembly if needed.
F3
Humidity Sensor Failure
  • Inspect humidity sensor wiring.
  • Clean sensor area inside cavity.
  • Test sensor resistance values.
  • Replace sensor if faulty.
E1
Thermistor / Temperature Sensor Fault
  • Inspect thermistor wiring.
  • Check resistance of sensor.
  • Ensure proper connection to control board.
  • Replace sensor if faulty.
E2
Overheat Protection Activated
  • Allow microwave to cool completely.
  • Check ventilation openings for blockage.
  • Ensure proper clearance around unit.
  • Restart after cooling cycle.
E5
Temperature Detection Fault
  • Allow unit to stabilize temperature.
  • Check internal airflow and vents.
  • Inspect sensor connection.
  • Restart after 10–15 minutes.
F5
Door Switch Issue
  • Check door latch alignment.
  • Inspect door switch for damage.
  • Ensure door closes fully.
  • Replace switch if needed.
DO
Door Open Error
  • Close door firmly until latch clicks.
  • Check for food debris blocking closure.
  • Inspect door hooks and hinges.
  • Replace latch assembly if faulty.
SE
Keypad Stuck Error
  • Clean control panel surface.
  • Check for moisture or debris.
  • Inspect keypad membrane condition.
  • Replace control panel if necessary.
F6
UI Communication Error
  • Inspect ribbon cable connection.
  • Check control board communication lines.
  • Reset power for 5 minutes.
  • Replace UI board if issue persists.
PF
Power Failure / Reset Required
  • Check household power supply.
  • Inspect outlet and plug connection.
  • Reset breaker if tripped.
  • Restart microwave cycle.
F7
Low Voltage Detected
  • Verify stable voltage supply.
  • Avoid using extension cords.
  • Check wiring and outlet condition.
  • Contact electrician if needed.
F8
Main Control Board Failure
  • Disconnect power for 5–10 minutes.
  • Inspect PCB for burn marks.
  • Check wiring harness connections.
  • Replace control board if required.
F9
Relay / Magnetron Control Fault
  • Inspect relay on control board.
  • Check magnetron power circuit.
  • Test wiring continuity.
  • Replace PCB if fault continues.

Frequently Asked Questions


Why does my Whirlpool microwave show system messages or error codes?
Whirlpool microwave system messages usually indicate issues with door switches, magnetron failure, high voltage components, overheating protection, sensor faults, or control board communication errors. Restart the microwave and check the door, ventilation, and power supply if the message persists.
Why does my Whirlpool microwave stop working suddenly?
Sudden shutdowns may be caused by thermal protection activation, power supply instability, faulty door switches, blown fuse, or control board failure. Turn off the microwave, allow it to cool, then restart after checking the outlet and door latch.
Why is my Whirlpool microwave not heating food properly?
Heating issues may be caused by a faulty magnetron, high-voltage diode failure, capacitor issues, door switch problems, or control board faults. Inspect components and ensure door closes securely.
Why is my microwave running but not heating?
This usually indicates magnetron failure, high-voltage circuit damage, or a defective inverter. Power supply may still run, but heating components are not functioning.
Why does my Whirlpool microwave not start?
Ensure the door is fully closed and all door switches are engaged. A faulty latch or misaligned door can prevent operation. Check power supply and control settings.
Why does my microwave show a door error?
Door errors occur when the latch is not detected, switches are misaligned, or wiring is damaged. Close the door firmly and inspect door switch assembly.
Why does my Whirlpool microwave show sensor errors?
Sensor errors may be caused by faulty temperature sensors, humidity sensors, loose wiring, or control board communication failure. Inspect connections and restart the unit.
Why is my microwave overheating?
Overheating is usually caused by blocked vents, cooling fan failure, heavy usage, or faulty thermal cutoffs. Allow unit to cool and ensure proper ventilation.
Why does my Whirlpool microwave keep restarting or losing power?
This may be caused by unstable voltage, loose wiring, faulty outlet, or control board issues. Avoid extension cords and ensure stable power supply.
Why does my microwave not turn on at all?
Check circuit breaker, outlet, internal fuse, and door switch system. A blown fuse or faulty control board is a common cause of no power.
Why does my Whirlpool microwave show a general system error?
General errors usually indicate control board malfunction or communication failure between internal components. A power reset may temporarily clear the issue.
Why is my microwave keypad not responding?
Keypad issues may be caused by membrane failure, moisture damage, ribbon cable disconnection, or control board faults. Clean panel and inspect connections.
How do I reset Whirlpool microwave system messages?
Turn off the microwave, unplug it for 5–10 minutes, then reconnect power. This clears temporary faults and resets the control system.
When should I service my Whirlpool microwave?
Service is recommended if heating fails, door issues persist, error codes repeat, unusual noises occur, or the unit shuts down frequently.
Important: Whirlpool microwave system messages are designed to protect key components such as the magnetron, high-voltage circuit, door switch assembly, thermal fuse, sensors, cooling fan, and control board. If issues continue after troubleshooting, disconnect power and contact a qualified appliance technician.