The compressor is the most critical component in an air source heat pump, responsible for heat transfer and system efficiency. Common issues include noise, overheating, refrigerant imbalance, and electrical faults. In the UK, repair costs range from £800 to £2,500+, while replacement can exceed £3,500. Early diagnostics prevent major system failure and reduce long-term costs.

Learn how air source heat pumps work in UK weather conditions, including winter performance, efficiency, costs, and heating system operation. Complete 2026 ASHP guide.