How Often Should a Heat Pump Be Serviced? What to Expect

Most homeowners should arrange a heat pump service at least once a year, even when the system appears to be working normally. Regular checks help protect reliability, maintain efficient operation and identify small issues before they become disruptive faults.

A proper service is more than a quick look at the outdoor unit. The engineer should assess the heat pump, controls and connected heating system as a whole, then explain any findings clearly so you know what action, if any, is needed.

How often should a heat pump be serviced?

For most air source and ground source heat pumps, an annual service is a sensible routine. Booking it before the main heating season can provide reassurance that the system is ready for colder weather, although the best timing may depend on the manufacturer’s instructions and how heavily the system is used.

Annual checks can support dependable performance, help maintain efficiency and provide an opportunity to review settings as your home changes. Some manufacturers, installers or warranty terms may also require documented servicing, so check your paperwork and follow the specified schedule where applicable.

A system used for heating and hot water throughout the year may benefit from closer monitoring. If you notice repeated error codes, unusual sounds, rising electricity use, poor room temperatures or a drop in hot water performance, arrange an assessment rather than waiting for the next routine visit.

What a routine service usually includes

The exact process varies by system, manufacturer and installation, but a competent engineer should inspect more than just the filter. They should consider how the heat pump is operating, how heat is being distributed around the property and whether the controls still suit your household.

• Cleaning or checking filters, strain gauges and accessible system components where fitted

• Electrical connections, isolators, safety devices and visible wiring

• A visual inspection of the refrigerant circuit, pipework, insulation and outdoor unit

• Sensors, control readings, flow temperatures and heating curves

• Defrost performance, system pressure, expansion vessel and glycol levels where relevant

On wet heating systems, the engineer may check system pressure and the condition or charge of the expansion vessel. Ground source systems and some other installations also require attention to glycol concentration and circulation. These checks help confirm that the system can transfer heat correctly and safely.

The visit may include a review of flow and return temperatures, weather compensation settings and the heating curve. If the home is comfortable but the controls are unnecessarily aggressive, small adjustments can improve comfort and reduce wasted energy.

Service, fault finding and optimisation are different visits

A routine service is a planned health check. It normally includes inspection, testing, basic cleaning and recording key readings, but it is not intended to diagnose every possible fault or redesign how the system operates.

Fault finding is needed when the heat pump is showing an error, stopping unexpectedly, making unusual noises or failing to heat properly. The engineer may need to test individual components, trace wiring, investigate flow restrictions or examine refrigerant-related symptoms. Further repair work may be required after the cause is confirmed.

A system optimisation visit focuses on performance and comfort rather than a specific breakdown. It can be useful if some rooms struggle, the system cycles frequently, electricity use seems high or the controls have never been properly reviewed after installation.

Before the engineer arrives

A little preparation can make the appointment more useful and help the engineer reach the relevant equipment quickly. You do not need to diagnose the issue yourself, but useful observations can shorten the investigation.

• Make sure the indoor unit, cylinder, controls and outdoor unit are accessible

• Have the manufacturer’s details and control app login available if relevant

• Write down recent error codes, warning messages or unusual noises

• Note which rooms struggle to reach temperature and when this happens

• Keep details of recent repairs, settings changes or power cuts to hand

It is usually best to leave normal heating settings unchanged before the visit unless the system is unsafe or has been instructed to remain off. Avoid removing covers or attempting electrical, refrigerant or pressure-related work yourself.

Signs of poor workmanship

A service should leave you with a clear explanation of what was checked and any recommended next steps. Be cautious if an engineer cannot provide useful readings, does not inspect the indoor system or controls, dismisses repeated symptoms without investigation, or recommends refrigerant work without explaining the evidence.

Other warning signs include leaving filters dirty, failing to check accessible pipework and insulation, making control changes without explaining them, or completing a very brief visit with no service record. A professional should also distinguish between routine maintenance and repairs that need separate approval.

Arrange your next heat pump service

Annual servicing is a practical way to maintain confidence in your heating system, support efficient operation and stay aligned with manufacturer or warranty requirements where applicable. It also gives you a useful opportunity to ask questions about comfort, controls and future performance.

For more detail, see our heat pump servicing checklist, or visit the Heat Pump Servicing page. To book Heat Pump Servicing, contact The Heat Pump Guy on 01689 495672.