Nibe Excessive icing / defrost inefficiency

Outdoor Nibe unit (for air‑source furnace/heat pump) covered in ice, poor heating performance

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.

Possible Causes

Blocked outdoor coil, faulty defrost sensor, low refrigerant charge, fan not running

Safety: Do not chip ice with sharp tools; you may damage the coil. Turn off power before cleaning.

Clear snow and debris: Remove snow, leaves, and obstructions from around and under the outdoor unit to ensure airflow.
Melt ice safely: Use warm water to melt heavy ice buildup. Do not use hot water or chemicals.
Check fan operation: After restoring power, ensure the outdoor fan runs during heating.
Monitor defrost cycles: The unit should periodically enter defrost mode. If it does not, a technician must check sensors and control logic.

Medium 3/5

Outdoor Coil Temperature Sensor

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