How to Maintain a Heat Pump: UK Homeowner Checklist
Last Updated: 4 November 2026
Quick Summary
A heat pump maintenance checklist in the UK combines monthly visual checks you can do yourself with an annual service from a qualified engineer. Keep the outdoor unit clear of debris and snow, clean the indoor filters monthly, and record anything unusual. Leave opening the unit and any internal work to a professional.
Monthly checks take about ten minutes and need no tools.
Keep the outdoor unit clear of debris, weekly in autumn.
Clean or rinse indoor filters at least monthly in busy periods.
Book a qualified engineer for an annual service.
Switch off and book an engineer if icing persists or staining appears.
Table of Contents
Why Regular Heat Pump Maintenance Matters in UK Homes
Regular heat pump maintenance keeps your system running efficiently and helps it last, and a clear heat pump maintenance checklist in the UK makes that routine easy to follow.
A heat pump is a heating system that moves heat from the outside air into your home (Heat pumps explained: experts answer your questions).
A heat pump maintenance checklist gives you a clear way to spot problems early. It splits the work between tasks you can safely do yourself and tasks that need a qualified engineer.
Clear airflow keeps the outdoor unit working efficiently
Clean filters help the indoor unit run smoothly
Regular checks make faults easier to spot before they become costly
Annual servicing by a qualified engineer keeps the system in good order
Monthly Visual Checks You Can Do Yourself
A monthly walk-around is the backbone of any heat pump maintenance checklist.
Work through this sequence each month:
Stand back and look at the clearances. The outdoor unit needs unobstructed air on all sides. Check the installation manual for the minimum clearance your model requires, as figures vary by model. Keep plants, bins, garden furniture and stored items outside that zone.
Clear debris. Remove leaves, grass cuttings, moss, twigs and anything else that has collected on the grille, fan guard or the ground beneath the unit. In autumn this may need doing weekly rather than monthly.
Inspect the casing. Look for dents, cracks, loose panels, rust spots or fixings that have worked loose. A panel that rattles in the wind is a common cause of noise complaints.
Check for staining or leaks. Water pooling under the unit in mild weather, oily marks on the casing or ground, or ice forming in a thick band on the coil all warrant a note and a call to your engineer.
Listen while it runs. Stand nearby when the system is heating. Rattling, grinding, humming that has changed pitch or repeated clicking are all worth recording.
Glance at the controls. Confirm the thermostat is set as you expect and that no error code is showing.
Record what you find. A simple notebook or phone note with the date, the outdoor temperature and anything unusual gives an engineer far more to work with than a vague memory.
Watch out: never remove panels, poke anything through the grille or hose down the electrics. The outdoor unit contains refrigerant pipework and live electrical components, and both are engineer-only territory.
If a check fails, use this simple decision path:
Icing on the coil that clears within a defrost cycle: normal in cold, damp weather. Monitor it.
Icing that persists or spreads: switch the system off at the controls and book an engineer.
Water or oil staining: note it, keep the area clear and arrange a service visit.
New or worsening noise: switch off if it is loud or accompanied by vibration, then report it.
Error code on the controls: note the code exactly as shown and contact your engineer.
This monthly routine is also the right moment to check the indoor filters, which are covered in the next section.
Heat Pump Filter Cleaning: Step by Step
Filters trap dust and dirt before the air reaches the heat pump. A blocked filter reduces airflow, which makes the system work harder. Cleaning the filter is one of the simplest jobs on any heat pump maintenance checklist in the UK, and it keeps performance steady.
Follow these steps:
Switch the heat pump off at the controls before you start
Locate the filter on the indoor unit and slide it out carefully
Remove loose dust by gently brushing or vacuuming the filter
Rinse the filter with lukewarm water if it is washable, and let it dry fully
Refit the filter securely and switch the system back on
Check your filters at least once a month during busy periods. If you are unsure how your model's filters come out or go back in, check the manufacturer's guidance first.
Heat Pump Winter Maintenance Tasks
Winter places extra demands on a heat pump, so a few extra checks help. Cold weather, snow and frost can all affect how well the outdoor unit performs.
Work through these tasks before the colder months arrive:
Clear snow and ice from around the outdoor unit regularly
Keep plants, bins and other items at a safe distance from the unit
Check that the drainage from the unit is clear and not frozen
Make sure heating controls and the thermostat are set as you expect
Watch for any change in how warm your home feels, and report it promptly
If the system struggles in cold weather, do not wait. Contact a qualified engineer as soon as possible.
Heat Pump Servicing Frequency and the Annual Service Checklist
Monthly checks and filter cleaning are only part of the picture. A qualified engineer should service your heat pump at least once a year, and this visit covers the parts a homeowner should not touch.
The annual service by a qualified engineer typically covers:
A full inspection of the outdoor and indoor units
Checks of system pressure and the wider heating system
Testing of controls, settings and heating performance
A review of the unit for leaks, wear or damage
A check of any faults recorded since the last visit
Booking the service in advance keeps the system on track and gives you a written record of its condition. If you are unsure which tasks need a certified engineer, you can find MCS certified heat pump installers in Wales and check how to verify their certification.
Homeowner Tasks Versus Engineer Tasks
Knowing where your responsibilities end is important. Some tasks are safe for homeowners, while others need a qualified engineer.
Tasks you can do yourself:
Keeping the outdoor unit clear of debris and snow
Cleaning or rinsing the indoor filters
Checking the unit visually for obvious damage or staining
Setting thermostat and heating controls within your normal range
Tasks that need a qualified engineer:
Opening the casing or touching internal components
Checking refrigerant, pressure and electrical parts
Repairing leaks, faults or damaged parts
Adjusting the system's internal settings
Leave any task that involves opening the unit or handling internal parts to a professional.
The table below sets out what a qualified engineer covers at the annual service compared with the tasks a homeowner can safely do between visits.
Task | Who does it | When |
Keep outdoor unit clear of debris and snow | Homeowner | Monthly, weekly in autumn |
Clean or rinse indoor filters | Homeowner | At least monthly in busy periods |
Full inspection of outdoor and indoor units | Qualified engineer | Annually |
Check system pressure and wider heating system | Qualified engineer | Annually |
Test controls, settings and heating performance | Qualified engineer | Annually |
Repair leaks, faults or damaged parts | Qualified engineer | As needed |
Signs Your Heat Pump Needs Attention
Most heat pump faults announce themselves quietly before they become expensive.
Keep a note of these five measures and review them monthly:
Energy use. Compare the same month year on year, or week on week in the heating season. A steady rise with no change in weather, occupancy or settings is a signal worth investigating.
Flow temperature. If your controls display the flow temperature, note it at a fixed outdoor temperature. A system that needs a higher flow temperature to hold the same room temperature is working harder than it used to.
System pressure. On a sealed heating system, check the pressure gauge on the indoor unit or cylinder. Confirm the correct cold pressure figure for your system in your manual. Pressure that drops repeatedly points to a leak.
Comfort at a set temperature. If rooms feel cooler at the same thermostat setting, or some radiators stay cold at the bottom, heat distribution has changed.
Noise and cycling. Note any new noise and how often the system switches on and off. Short cycling in mild weather often indicates a controls or refrigerant issue.
When something changes, match it to the likely cause and the right response:
Bills rising, rooms still warm: check filters, clearances and thermostat schedules first, then book a service.
Pressure falling repeatedly: top up once if your manual allows, note the amount, and call an engineer. Do not keep topping up.
Ice that will not clear: switch off and book an engineer; persistent icing usually points to a refrigerant or defrost fault.
Water or oil staining: stop using the system if the stain is oily, keep people and pets away, and arrange a visit.
Grinding or loud vibration: switch off at the controls and report it.
Error code: record the exact code and contact your engineer; codes are manufacturer-specific and guessing wastes time.
Ask your engineer whether your system supports remote monitoring and what it records.
Watch out: do not reset error codes repeatedly or keep running a system that is tripping. Repeated resets can mask a fault that is doing damage, and they make diagnosis harder for the engineer.
If two or more of these signs appear together, treat it as a prompt to book a service rather than waiting for the annual visit. Early attention is almost always cheaper than a repair.
Booking Your Next Heat Pump Service with Heatgeek Wales
Regular servicing is the best way to protect your heat pump and keep it efficient. Heatgeek Wales provides MCS-certified air source heat pump engineering and installation for homes across Wales.
If you would like help with your next service, book a heat pump service with Heatgeek Wales. You can also find a qualified heat pump engineer near you if you need someone local.
Frequently Asked Questions
What maintenance does a heat pump need?
A heat pump needs regular visual checks, filter cleaning and clearing debris from the outdoor unit, plus an annual service by a qualified engineer. Homeowners can carry out the routine checks themselves: keep the area around the outdoor unit clear, look for visible damage, staining or leaks, and listen for unusual noise or vibration. Anything involving refrigerant, electrical work or system pressure should be left to a qualified engineer. Keeping a simple log of these checks makes it easier to spot changes over time and gives your engineer useful information at the annual service.
How often should a heat pump be serviced?
Most heat pumps should be serviced once a year by a qualified engineer, with the service ideally booked before the heating season begins. Homeowners should carry out simple checks more often, typically monthly during use, and clean filters according to the manufacturer's guidance. Check your installation paperwork and warranty terms, as some warranties depend on servicing being completed and recorded. A regular service helps keep the system running efficiently and can identify small faults before they become costly repairs.
Can I maintain my heat pump myself?
You can carry out routine homeowner tasks yourself, such as keeping the outdoor unit free of leaves and debris, checking that airflow is not blocked, cleaning accessible filters and watching for visible damage or unusual noise. Tasks that involve opening the refrigerant circuit, adjusting system pressure, working on electrical components or making changes to the installation should be carried out only by a qualified engineer. Doing the simple checks well means you will notice problems early and can give your engineer a clear picture at the annual service.
What should I check on my heat pump in winter?
In winter, clear snow, ice and fallen leaves from around the outdoor unit so air can flow freely and the fan is not obstructed. Check that the unit is not blocked by items stored nearby, that condensate drainage is clear, and that thermostat and heating control settings match how you use the home. Listen for unusual noise or vibration and watch for any signs that the house is not reaching the temperature you expect. If a check fails or performance drops noticeably, contact a qualified engineer rather than trying to fix it yourself.
Keeping on top of the basics makes a real difference to how your heat pump performs. Monthly checks, clean filters, a clear outdoor unit and an annual service will protect your investment for years to come.
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