Haier Refrigerator Error Code F1 — Refrigerator Defrost Sensor Error
What this means
Error code F1 on Haier refrigerators indicates the defrost temperature sensor (thermistor) in the fresh food (refrigerator) compartment has returned an abnormal reading. This sensor monitors the evaporator temperature during defrost cycles. If it reads open, shorted, or out of range, the control board cannot determine when to end the defrost cycle, which can lead to excessive frost buildup or insufficient cooling. The refrigerator may continue to run but defrost cycles will be impaired.
Step-by-step fix
4 stepsReset the refrigerator
Unplug the refrigerator for 10 minutes, then plug it back in. Some sensor errors are caused by temporary electrical glitches that clear after a full power cycle.
Keep the doors closed during the reset to maintain temperature inside.
Locate the defrost sensor
The defrost sensor is clipped to the evaporator coils behind the back panel inside the refrigerator compartment. Remove shelves, then unscrew and remove the back panel to access the evaporator and sensor.
If there is heavy frost on the evaporator, you will need to defrost manually before accessing the sensor. Unplug the unit and let ice melt, or use a hair dryer on low heat.
Test the defrost sensor
Disconnect the sensor leads. Using a multimeter, measure the resistance. At room temperature (~72°F), it should read approximately 10,000–15,000 ohms for an NTC thermistor. OL (open) or near-zero (shorted) means it has failed.
Compare the reading to the sensor that came with your model — Haier uses different thermistor curves on different models.
Replace the defrost sensor
Unclip the old sensor from the evaporator, disconnect the wiring, and install the replacement. Route the wire along the same path as the original. Reassemble the back panel and shelves.
After replacing the sensor, manually initiate a defrost cycle (if your model supports it) to verify the new sensor communicates correctly with the board.
When to call a professional
If the sensor tests good but F1 persists after a reset, the main control board may have a faulty sensor input. Board replacement requires professional service.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
Learn more about our sourcesParts you may need
Defrost Temperature Sensor
Part #RF-4985-15 · $10–$25
If sensor reads OL or near zero at room temperature
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