Heat Pump Ice Build-up
Heavy ice or frost forming on the outdoor heat pump unit, particularly on the coils, that does not defrost.
What Is Causing This?
- 1Defrost cycle not activating due to a sensor fault
- 2Low refrigerant preventing proper defrost
- 3Airflow restricted by debris, leaves, or snow around the unit
How Urgent Is This?
This should be fixed in the coming weeks. Leaving it may allow the problem to worsen and cost more to repair.
What Needs to Be Done
A heat pump engineer will check the defrost sensor and controls, test refrigerant levels, clear any airflow restrictions, and repair the defrost cycle.
How Much Will It Cost?
National average estimate
Labour: £2,033 – £5,083 | Materials: £4,000 – £10,017
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Try Snap and FixHow to Prevent This
Keep the outdoor unit clear of leaves, snow, and vegetation. Ensure adequate airflow around all sides. Do not try to chip ice off the coils.
Related Problems
Other Heat Pump Installer Problems
The heat pump is running but not producing enough heat to warm the house or hot water.
The heat pump outdoor unit producing excessive vibration, buzzing, rattling, or humming.
The heat pump controller or display showing an error or fault code, and the system stopping or reducing output.
Rooms not getting up to the temperature set on the thermostat, even after the heat pump runs for a long time.