F1
Whirlpool
Ice Maker Thermistor / Mold Sensor Fault
Whirlpool ice maker (refrigerator style) shows F1 on display and stops ice production
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open or shorted ice mold thermistor, broken harness in freezer door, failed ice maker module sensor circuit
How to Fix / Troubleshooting
Safety: Disconnect power to the refrigerator before working in the freezer compartment or door.
- Access ice maker: Remove the ice bin and any covers to expose the ice maker assembly.
- Inspect harness: On French door models, check the wiring harness where it passes through the freezer door hinge for breaks or pinched wires.
- Test mold thermistor: If accessible, disconnect the thermistor leads and measure resistance. Compare to Whirlpool’s chart. Replace the ice maker assembly if the thermistor is integrated and out of spec.
- Check connectors: Reseat the ice maker plug at the ceiling or rear wall connection.
- Restore power and test: After reassembly, restore power and allow several hours for the ice maker to cycle. If F1 returns, replace the ice maker assembly or control board per Whirlpool’s service bulletin for your model.
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Repair Difficulty
Medium
3/5
Required Part
Ice Maker Assembly
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