A structured annual service for an air source heat pump — water side, outdoor unit, performance, DHW, controls and (for split systems) the refrigerant circuit — with a clear result and next-service date.
⚠️ Refrigerant work applies to split systems only and must be carried out by an F-Gas qualified engineer. Monobloc units are sealed — no refrigerant handling. Always follow the manufacturer's service schedule.
1 Service details
2 Refrigerant circuit — split only, F-Gas
Visual leak check — pipework & joints
F-Gas leak check carried out & logged
3 Water side
Magnetic / strainer filter cleaned
Inhibitor / glycol concentration checked
Expansion vessel charge checked
4 Outdoor unit
Coil / heat exchanger cleaned
Fan operation & condition
Airflow clear of debris / planting
Condensate drain clear / frost protected
Mounting / casing secure & sound
5 Performance
Defrost cycle operating correctly
Weather compensation curve checked
6 Hot water
Pasteurisation / legionella cycle operating
Immersion / backup heater check
7 Controls & electrical
Controls / thermostat functioning
Fault / error log reviewed
Electrical connections / isolation visual
8 Outcome
Service record only. Follow the manufacturer's service schedule and complete any manufacturer service form needed to maintain the warranty. Refrigerant circuit work on split systems must be done by an F-Gas qualified person.