Heat Pump Repair Cost Overview
Heat pump repair costs in the UK vary widely depending on the fault, the age of the system, and the engineer’s rates. Minor repairs such as replacing a sensor or fan motor typically cost £150–£400. Major repairs like compressor replacement can cost £1,000–£2,500.
Common Repair Costs
- Diagnostic callout fee: £75–£120
- Refrigerant recharge (top-up): £200–£400 (includes F-Gas certified engineer)
- Refrigerant leak repair + recharge: £300–£700
- Fan motor replacement: £200–£500
- Compressor replacement: £1,000–£2,500
- Control board replacement: £300–£600
- Expansion valve replacement: £250–£450
- Thermostat/sensor replacement: £150–£300
- Heat exchanger descale: £150–£300
- Defrost sensor replacement: £150–£250
When Is Replacement Better Than Repair?
As a rule of thumb, if a repair costs more than 50% of the cost of a new unit, replacement is usually the better financial choice — especially if the system is over 12–15 years old. Factor in the current Boiler Upgrade Scheme grant of £7,500 when calculating the cost of replacement.
Does Insurance Cover Heat Pump Repairs?
Standard home insurance rarely covers heat pump breakdowns. A dedicated heat pump cover plan (£15–£30/month) typically covers callout fees, parts, and labour for most repairs, capping your exposure to unexpected costs.
How to Reduce Repair Costs
The best way to minimise repair costs is annual servicing. Regular maintenance catches developing faults early, extends component life, and maintains manufacturer warranty. Choose an F-Gas certified, MCS-accredited engineer for all refrigerant-related work.
Sources: MCS and Part P registered.
