Heat Pumps
Air source heat pump problems, fault codes, running costs and brand-specific guides
8 free DIY guides · 23 total
Heat pumps are now the UK government's preferred low-carbon heating solution, backed by the Boiler Upgrade Scheme (BUS) grant of up to £7,500 — but they work very differently from a gas boiler, and diagnosing faults requires a different approach. Air source heat pumps need correct flow temperatures, adequate radiator or underfloor heating surface area, and annual maintenance to reach their rated COP (coefficient of performance). These guides cover the most common heat pump problems, brand-specific fault codes for Mitsubishi Ecodan, Daikin Altherma, Vaillant aroTHERM, Worcester Bosch, Samsung EHS, and Grant Aerona3, and how to get the best efficiency from your heat pump installation.
Heat Pump Running Costs Too High — How to Reduce Them
Electricity bills higher than expected since the heat pump was installed
Mitsubishi Ecodan Heat Pump Problems — Fault Codes & Fixes
Ecodan not working, showing P1, P5, U7 or other error codes
Heat Pump Error Codes — What They Mean and What to Do
Your heat pump is showing an error code or fault — here's how to respond
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