Air source heat pumps (ASHPs) are becoming a popular heating solution for homes in the UK. They’re energy-efficient, environmentally friendly, and can save you money in the long run. But just like any heating system, they’re not perfect. Over time, you may start to notice reduced performance, unusual noises, or increasing energy bills.
In this article, we’ll break down some of the most common problems homeowners face with air-source heat pumps—and more importantly, how expert servicing can make a significant difference. If you’ve already invested in an ASHP or are considering one, knowing these basics will help you keep your system running smoothly throughout the year.
What Is an Air Source Heat Pump?
An air source heat pump extracts heat from the outside air, even in winter, and uses it to warm your home and water. It works like a fridge in reverse and can be used for heating, hot water, and sometimes even cooling in summer.
They’re brilliant for lowering your carbon footprint, and with the UK government offering incentives through schemes like the Boiler Upgrade Scheme, more households are making the switch.
So, What Can Go Wrong?
Despite their efficiency, air source heat pumps can develop issues, especially if they’re not serviced regularly. Let’s look at some of the common problems:
1. Reduced Heating Efficiency
This is the first thing homeowners notice. The heat pump isn’t warming your home as well as it used to. It could be down to several things:
- A dirty filter is blocking airflow
- Low refrigerant levels
- Outdoor unit covered in leaves, dirt or ice
All of these reduce the system’s ability to absorb heat from the air and transfer it into your home.
Pro Tip: Clean your filters monthly and ensure the outdoor unit is free from debris. Still not working right? Time to call in a pro.
2. Strange Noises
A heat pump isn’t silent, but it shouldn’t sound like a clunky washing machine either. Grinding, rattling, or hissing noises can be signs of:
- Loose fan blades
- Debris is stuck in the unit
- Worn-out motor or compressor issues
If your heat pump starts sounding like it’s struggling, don’t ignore it. Strange noises often indicate a minor issue, but if left unchecked, they can escalate into a more significant and costly problem.
This is where professional servicing comes in handy. Experienced engineers can identify issues early and resolve them before they escalate into more significant problems. A trusted local service provider, such as https://servicemy.co.uk/, can help with both routine maintenance and emergency repairs to get things sorted quickly.
3. Icing Up in Winter
It’s normal for the outdoor unit to frost up during cold months, but it should defrost itself using a built-in cycle. If the entire unit is covered in ice and it’s not melting, something is wrong.
Possible causes include:
- Faulty defrost cycle
- Blocked airflow
- Low refrigerant
Too much ice can prevent the unit from absorbing heat from the air. The result? A cold home and a sky-high electric bill.
4. Heat Pump Not Turning On
This can be a major headache. A system that won’t switch on could be caused by:
- A tripped breaker
- Thermostat issues
- A faulty capacitor or motor
Before you panic, check your settings and fuses. However, if everything appears to be in order and the system still won’t start, it’s time to seek professional help.
5. Poor Airflow
If it feels like the system is running but not much warm air is coming out, it could be due to:
- Blocked vents or filters
- Faulty fan
- Duct issues (if your system uses them)
Good airflow is crucial for proper heating. Blockages cause your system to work harder, resulting in higher bills and a shorter system lifespan.
6. Unusual Smells
Heat pumps should not produce bad smells. If they do, here’s what it might mean:
- Musty smell – Mould or mildew in the unit or ducts.
- Burning smell – Electrical issues or overheating parts.
- Rotten smell – Could indicate a pest issue inside the unit.
None of these is normal. You’ll want to have an expert inspect your system to be safe.
Why Regular Servicing Matters
Just like a boiler, a heat pump works best when it’s properly maintained. Regular servicing:
- Improves efficiency
- Reduces energy bills
- Extends lifespan
- Catches small problems before they become big ones
According to the Energy Saving Trust, a well-maintained heat pump can last 15 to 20 years. But skipping annual checks can lead to breakdowns, poor performance, and even system failure.
What Happens During a Heat Pump Service?
A professional engineer will usually:
- Clean and inspect filters.
- Check refrigerant levels.
- Inspect coils and connections.
- Test thermostat and system controls.
- Lubricate moving parts.
- Ensure the defrost cycle operates appropriately.
They’ll also give you advice tailored to your specific system and home setup.
Booking a heat pump service might feel like another job on the to-do list, but it could save you hundreds in the long run. If you need reliable, experienced servicing, check out Service My. They specialise in heat pump maintenance and understand the needs of UK households.
When Should You Service Your Heat Pump?
It’s recommended to have your air source heat pump serviced at least once a year. The best time? Ideally, just before winter hits. That way, your system is ready to keep you warm when it matters most.
If your system is used for cooling as well, a second service in spring can also be a smart idea.
Signs It’s Time for a Service (Even If You Had One Recently)
- You notice higher energy bills.
- There’s less heat output than before.
- Strange noises or smells.
- The outdoor unit is permanently frozen.
- It takes ages to heat the house.
Don’t wait for the system to break down completely. Quick action helps avoid costly repairs.
Final Thoughts
Air source heat pumps are a fantastic investment for energy-conscious homeowners, especially here in the UK, where heating costs can skyrocket during the colder months. But like all heating systems, they come with their own set of challenges.
Staying on top of maintenance and addressing issues promptly can make a significant difference to your comfort and your wallet. Whether it’s a minor fault or an annual check-up, expert servicing is the best way to keep your system running safely and efficiently.
For peace of mind and top-notch local support, turn to a professional team like Service My. They offer affordable servicing, emergency call-outs, and expert advice tailored to your system.
