dF
Ikea
Extended Defrost Cycle / Defrost Control Issue
Display shows dF or a defrost symbol for an extended time; freezer may warm slightly during this period.
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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
Control board stuck in defrost mode, Faulty defrost sensor feedback, Relay on board not switching back to cooling, Software glitch
How to Fix / Troubleshooting
Safety: Unplug the freezer before accessing internal components.
Steps:
- 1. Wait and observe: A normal defrost cycle can last 20–40 minutes. If dF remains for several hours and the freezer warms significantly, there is likely a fault.
- 2. Power cycle: Unplug for 10–15 minutes to reset the control. If dF reappears and stays, proceed with checks.
- 3. Check defrost sensor: Test the evaporator defrost NTC as described under F3. Incorrect readings can cause the board to misjudge defrost completion.
- 4. Inspect control board: Look for signs of damage around the defrost relay. If the relay is stuck closed, the heater may stay on too long.
- 5. Replace faulty parts: Replace the defrost sensor if readings are off. If the sensor is good, replace the main control board.
Warning: Prolonged defrost heater operation can overheat the cabinet; disconnect power if you suspect the heater is stuck on.
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Repair Difficulty
Hard
4/5
Required Part
Main Electronic Control Board
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