AOS Blog
When Does an Air Source Heat Pump Require Servicing?
Air source heat pumps (ASHPs) are a fantastic way to heat your home efficiently while reducing energy costs. However, like any heating system, they require regular maintenance to ensure they run smoothly and efficiently.
But how often does an air source heat pump need servicing? What are the signs that maintenance is due? And what happens during a professional service? In this guide, we’ll answer these questions and explain how to keep your heat pump performing at its best.
How Often Should an Air Source Heat Pump Be Serviced?
Most manufacturers recommend having your air source heat pump serviced once a year. This ensures the system remains efficient, extends its lifespan, and prevents costly repairs.
Annual servicing is particularly important if:
✔️ Your heat pump is your primary heating system and runs daily.
✔️ You live in an area with high levels of dust, debris, or salt air (e.g., coastal regions).
✔️ Your heat pump is used for both heating and cooling, meaning it operates year-round.
Even if your heat pump seems to be working fine, a routine check-up can prevent small issues from turning into major faults.
What Are the Signs That a Heat Pump Needs Servicing?
While annual servicing is recommended, you should also schedule maintenance if you notice any of the following warning signs:
🚩 Reduced Heating or Cooling Efficiency – If your home takes longer to reach the desired temperature or struggles to maintain it, your heat pump may need cleaning or a refrigerant top-up.
🚩 Unusual Noises – Rattling, banging, or buzzing sounds can indicate issues with the fan, compressor, or other internal components.
🚩 Higher Energy Bills – A sudden increase in energy costs could mean your heat pump is working harder than necessary due to a clogged filter or mechanical issue.
🚩 Ice Build-Up on the Outdoor Unit – While some frost is normal in winter, excessive ice or blockages can indicate airflow problems or a faulty defrost cycle.
🚩 Weak Airflow – If the heat pump is running but not producing strong airflow, it may need a filter change or fan repair.
If you notice any of these issues, don’t wait for your next scheduled service—arrange a professional inspection as soon as possible.
What Happens During a Heat Pump Service?
A professional service ensures that all components of your heat pump are in good working order. Here’s what you can expect during a typical maintenance visit:
1. Cleaning and Inspecting the Outdoor Unit
• The outdoor unit (compressor) is checked for debris, dirt, and obstructions.
• The heat exchanger coils are cleaned to improve efficiency.
• The fan blades and motor are inspected for wear and damage.
2. Checking Refrigerant Levels
• Low refrigerant levels can affect performance and increase energy consumption.
• The technician will check for leaks and top up refrigerant if needed.
3. Testing Electrical Connections and Components
• All wiring, relays, and connections are inspected to prevent electrical faults.
• The thermostat and control settings are tested to ensure they’re working correctly.
4. Inspecting and Cleaning Air Filters
• Dirty or clogged filters reduce airflow and efficiency.
• Filters are cleaned or replaced to improve performance.
5. Checking the Defrost Cycle (Winter Maintenance)
• Heat pumps have an automatic defrost function to prevent ice build-up.
• The system is tested to ensure it activates correctly when needed.
6. Assessing the Overall System Performance
• The technician will run the system and check that it is heating or cooling as expected.
• Any minor issues are addressed before they become major problems.
Can You Maintain a Heat Pump Yourself?
While professional servicing is essential, there are some simple maintenance tasks homeowners can do to keep their heat pump running efficiently:
✅ Clean or Replace Air Filters Regularly – Check your filters every 1-3 months and clean or replace them as needed.
✅ Keep the Outdoor Unit Clear – Remove leaves, dirt, and debris from around the outdoor unit to ensure proper airflow.
✅ Check for Obstructions – Make sure vents and radiators are not blocked by furniture or curtains.
✅ Monitor Energy Usage – If you notice a sudden increase in energy bills, it could indicate a problem with your heat pump.
✅ Listen for Unusual Noises – Strange sounds could mean a component is loose or needs attention.
By taking these simple steps, you can help extend the life of your heat pump and maintain its efficiency between professional services.
What Happens If You Don’t Service Your Heat Pump?
Neglecting regular servicing can lead to a range of problems, including:
⚠️ Reduced Efficiency – A dirty or poorly maintained heat pump will use more energy to provide the same level of heating.
⚠️ Higher Running Costs – If your system is struggling due to clogged filters or low refrigerant, your energy bills will increase.
⚠️ Increased Risk of Breakdowns – Small issues, if left unchecked, can lead to costly repairs or even system failure.
⚠️ Shorter Lifespan – A well-maintained heat pump can last 15-20 years, but poor maintenance can shorten its lifespan significantly.
Investing in annual servicing ensures your heat pump remains reliable and cost-effective for years to come.
Conclusion: Keep Your Heat Pump Running Efficiently
Regular servicing is the key to maintaining your air source heat pump’s performance and efficiency. To summarise:
✔️ Schedule a professional service once a year.
✔️ Watch for warning signs like reduced efficiency, unusual noises, or higher energy bills.
✔️ Keep up with basic maintenance, such as cleaning filters and clearing debris.
✔️ Don’t ignore potential issues—early repairs prevent costly breakdowns.
At AOS Energy Efficient Heating Systems, we offer expert servicing and maintenance for air source heat pumps. If you’re considering air pump installation in Cambridgeshire, we provide professional, energy-efficient solutions tailored to your home’s needs.
📞 Contact us today to book a service or discuss a new heat pump installation!
