Check what the system is being asked to do
Heat pumps often operate differently from traditional boilers, using longer run times and lower flow temperatures. Control settings, weather compensation and heating schedules can therefore have a large influence on room temperatures.
Water circulation
Poor circulation, air, blocked strainers, closed valves or pump problems can restrict heat delivery. The exact hydraulic checks depend on the system installed.
Radiators and underfloor heating
Emitters must be capable of delivering the required room heat at the design flow temperature. A heat pump cannot compensate for fundamentally undersized emitters simply by running indefinitely.
Outdoor unit condition
An air source heat pump needs appropriate airflow. Obstruction or contamination around the outdoor heat exchanger can affect operation. Frosting and defrost are normal aspects of ASHP operation in certain weather, but persistent abnormal behaviour warrants investigation.
Hot water priorities
Systems that also produce domestic hot water may temporarily prioritise cylinder heating. Understanding the control strategy helps distinguish normal operation from a fault.
Get the whole system assessed
Envirowarm services air source and ground source systems across Hull and East Yorkshire. Read our heat pump servicing guide and see our recent LG heat pump service in Kingswood HU7.