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Looking after your air source heat pump mainly involves a few simple, regular checks you can easily do yourself. With a bit of routine care, you’ll help it run more efficiently, reduce energy costs, extend its lifespan, and prevent avoidable breakdowns between professional servicing. Staying on top of these basic tasks ensures your system delivers reliable heating and cooling all year round.
Before doing any maintenance, remember that a heat pump contains high-pressure refrigerant and electrical components. Homeowner checks should always be visual and surface-level only.
Never remove covers, touch wiring, or undo any pipework. If you are in any doubt, stop and speak to a qualified heat pump engineer rather than taking a chance.
Your outdoor unit needs plenty of air to work efficiently. Restricted airflow makes the system work harder, use more electricity and wear out faster.
In winter, check more often for snow build-up or windblown debris. If snow does collect around the base, gently clear it away so air can move freely through the coil.
A few minutes of observation can catch small issues before they become bigger and more expensive. Choose a time when the heat pump is running steadily, not just starting up or shutting down.
Stand near the outdoor unit and listen for any new or unusual noises. A gentle fan sound and compressor hum are normal, but loud rattling, grinding or banging usually are not.
Light vibration is expected, but the unit should not be shaking. If it looks loose on its brackets or slab, or if pipes are visibly wobbling, book a professional to secure it properly.
Indoors, check for new error messages on the controller, unexplained resets, or rooms not reaching the set temperature. Make a note of anything you spot, including when it happens, to share with your engineer.
Blocked indoor filters are a common cause of poor performance and higher running costs. They reduce airflow, causing the system to run longer to achieve the same comfort level.
If your system has accessible filters behind indoor grilles or on fan coil units, you can usually clean them yourself. Always follow the manufacturer’s instructions for your specific model.
Turn the system off, gently remove the filter and vacuum or rinse if the manual allows. Let it dry fully before refitting. Avoid harsh chemicals or scrubbing, as this can damage the mesh.
As a rule of thumb, check filters every 1 to 3 months, or more often if you have pets, live near a busy road or have recently done building work.
In cold, damp weather, the outdoor coil will naturally frost up. The heat pump will occasionally run a defrost cycle to clear this ice and keep efficiency up.
During defrost, you may notice the outdoor fan stopping, steam rising from the unit and a temporary change in sound. Indoors, you might feel slightly cooler air for a short time.
This is normal and not a fault. Problems to watch for are heavy ice that never clears, thick sheets of ice on the base of the unit, or repeated fault codes during cold snaps. These are signs to call an engineer.
Air source heat pumps produce condensate water, which should drain away safely. If the drains block, you can get leaks, icing or internal damage.
Visually follow any exposed drain pipework from the indoor unit or buffer tank. Make sure it is not kinked, crushed, frozen or disconnected and that the outlet is not buried or blocked.
Look for water staining, drips or puddles around the unit, particularly during wet or very humid weather. If you suspect a blockage, do not take anything apart. Instead, call a professional to clear the drain and check the trap.
Homeowners should not adjust or test refrigerant pressures, but you can keep an eye on overall performance. Your main tools are comfort level, running hours and basic temperature checks.
Note how long the system runs to heat your home compared with last year at similar outdoor temperatures. If it seems to be on much longer or struggling to warm the rooms, that is useful information for your engineer.
If your controller shows flow and return temperatures, you can record typical readings in normal operation. You are not adjusting anything, just building a picture of what is normal for your system.
Sustained changes, such as much lower flow temperatures than usual or frequent cycling on and off, are a good reason to book a service visit.
Some tasks should always be left to qualified heat pump engineers. Getting these wrong can be dangerous, damage the unit or void warranties.
Do not block the outdoor unit with covers, screens or furniture. Any decorative housing must be designed for heat pumps with proper airflow and clearance.
Do not pressure wash the outdoor coil fins. High-pressure water bends the delicate fins and can force water into electronics. If the coil looks dirty, mention it at your next service.
Do not attempt to top up or release refrigerant. Working on refrigerant circuits is a specialist, F-gas-regulated job and mistakes can be dangerous and costly.
Do not remove electrical panels, reset unknown breakers or tamper with wiring. If something keeps tripping, you need an electrician or heat pump engineer, not repeated resets.
Even with a good homeowner routine, your heat pump still needs regular professional care. An annual service is typical for most homes, and some manufacturers require this to maintain the warranty.
Book a professional service if you notice rising energy bills with no obvious reason, rooms not reaching set temperatures, frequent fault codes or error lights, unusual noises that persist, or icing that does not clear on its own.
It is often best to schedule servicing in late summer or early autumn, before the heaviest heating demand in Leeds, Wakefield, Wetherby and Harrogate. This gives you time to sort out any issues before cold weather hits.
If your air source heat pump is not performing as it should, or it has been more than a year since it was last checked, it is time to bring in a professional. Using your checklist alongside regular servicing is the best way to protect your investment.
For homeowners in Leeds, Wakefield, Wetherby and Harrogate, S.P CONTRACTORS LIMITED can handle thorough heat pump servicing and repairs. To book a visit or discuss a performance issue, call 07802742177 and speak to the team today.
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