dF
Certikin
Defrost Mode / Defrost Control Fault
Display shows dF or DEF; heat pump cycles frequently and may not reach set temperature.
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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
Iced-up evaporator coil on Certikin heat pump, Faulty defrost sensor, Incorrect defrost control settings, Poor airflow causing excessive icing
How to Fix / Troubleshooting
Safety first: Isolate power before touching coils or sensors.
- Inspect evaporator: Check the outdoor coil for ice build-up. Light frost is normal; heavy ice blocking airflow is not.
- Clear obstructions: Remove leaves and debris from around the unit to improve airflow.
- Check defrost sensor: Locate the coil sensor clipped to the evaporator and ensure it is firmly attached and not hanging loose.
- Allow manual defrost: Turn off the unit and allow ice to melt naturally. Do not chip ice with tools.
- Restart and observe: Restore power and monitor whether the unit enters and exits defrost correctly.
If defrost issues persist, the defrost control parameters and sensors should be checked by a heat pump specialist.
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Repair Difficulty
Hard
4/5
Required Part
Certikin heat pump defrost sensor / control
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