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Last updated: 12th July, 2024


Heat Pump Repair

Heat Pump Repair

Key takeaways

  • Heat pumps are vital for energy efficiency and reducing emissions.
  • Regular maintenance can prevent costly repairs.
  • Understanding repair costs and when to call a professional is crucial.

Regular maintenance is essential for a heat pump's longevity. Replacing dirty filters and inspecting the ducts for leaks can prevent many issues.

Heat pumps are a crucial part of many properties, especially as the country pushes towards net zero and embraces renewable technology. One of the biggest advantages of heat pumps is their energy efficiency, significantly reducing emissions compared to traditional heating systems. However, like any system, heat pumps require regular maintenance and sometimes repairs to function at their best.

Regular system inspections can prevent common issues such as leaks, blocked ducts, and malfunctioning components. Repair costs in the UK for 2024 can range widely, from a few hundred to several thousand pounds, depending on the issue. Knowing when to call a professional can save time and money, ensuring you get the most out of your investment.

Whether you have an air source heat pump or ground source heat pump, maintaining your system is essential. This guide will provide insights into common problems, repair costs, and tips for DIY fixes. Stay tuned to learn how to keep your heat pump running efficiently and reduce your carbon footprint.

What Is a Heat Pump?

A heat pump is a device that transfers heat from one place to another. It can work both for heating and cooling spaces. This makes it an efficient choice for homes.

How It Works-

  1. Heat Capture: It captures heat from the outside air, ground, or water.

  2. Evaporation: The captured heat causes the liquid refrigerant in the pump to evaporate.

  3. Compression: The gas is then compressed, increasing its temperature.

  4. Heat Release: The heat is then transferred to radiators or under-floor heating systems.

Types of Heat Pumps:

  • Air Source Heat Pumps: These take heat from the air.

  • Ground Source Heat Pumps: These draw heat from the ground.


Heat pumps are highly efficient. They use electricity to move heat, rather than generate it. For every unit of electricity used, they can provide several units of heat.


  • Lower Energy Bills: Using a heat pump can reduce energy bills, especially when compared to traditional heating systems.

  • Eco-Friendly: They are environmentally friendly, reducing the home's carbon footprint.


  • Insulation: Good home insulation is essential for the best performance.

  • Radiators: Upgrading radiators might be necessary to maximise efficiency.

Heat pumps offer a versatile heating solution, reducing both energy usage and costs.

The Different Types of Heat Pump

Heat pumps are highly efficient systems that provide heating and cooling. They come in two main types: ground source and air source. Each type uses different techniques and equipment to transfer heat.

Ground Source Heat Pump

Ground source heat pumps (GSHPs) extract heat from the ground using a network of pipes buried underground. These systems can have either a horizontal or vertical setup.

In a horizontal system, pipes are laid out in long, shallow trenches, while a vertical system uses deep boreholes to reach greater depths. The heat extracted is transferred to a compressor through the pipes. This process increases the temperature, which is then used to heat the home.

GSHPs are efficient because the ground temperatures remain fairly constant throughout the year. Installation costs typically range from £6,000 to £11,000. They are more suited for properties with large outdoor spaces suitable for either trenches or boreholes.

Air Source Heat Pump

Air source heat pumps (ASHPs) draw heat from the air outside. They come in two types: air-to-water and air-to-air. The air-to-water type heats water for radiators, underfloor heating, and hot water systems. The air-to-air type provides heating and cooling through ducts, similar to a central air conditioning system.

The process involves a fan that pulls air into the system. The heat is absorbed and transferred to the heat pump’s compressor, which increases the temperature. These systems are less expensive to install, costing between £2,500 and £13,000.

ASHPs are simpler to install compared to GSHPs and can be used in a variety of properties. They are particularly useful in homes where ground installation space is limited.

Heat Pump Costs UK 2024

When considering a heat pump in the UK for 2024, it's essential to understand the different costs involved.

Air Source Heat Pump Costs

  • Supply and Installation: £2,400 - £14,050

  • Running Costs: £685 - £1,550 per year

  • Government Grants: Up to £7,500 may be available, reducing upfront costs

These costs can vary based on the size of the home and specific energy needs.

Ground Source Heat Pump Costs

  • Supply and Installation: £6,000 - £24,000

  • Running Costs: Varies depending on energy usage and home size

  • Boiler Upgrade Scheme: May help offset costs by up to £7,500

Ground source heat pumps are typically more expensive than air source models but can offer increased efficiency.

Service and Maintenance Costs

  • Annual Maintenance: £100 - £200

  • Repair Costs: £500 - £600 on average (extensive repairs up to £2,000)

Proper maintenance is crucial to ensure the longevity and efficiency of the heat pump, with an average lifespan of 10 to 15 years.

Total Costs Comparison

Type of Heat Pump

Installation Cost Range (£)

Running Cost Range (£/year)

Air Source Heat Pump

2,400 - 14,050

685 - 1,550

Ground Source Heat Pump

6,000 - 24,000


Understanding the cost helps in making an smart informed decision about which heat pump might be the best fit for a specific situation.

Heat Pump Repair

Regular maintenance is essential for a heat pump's longevity. Replacing dirty filters and inspecting the ducts for leaks can prevent many issues. It's recommended to check the blower and indoor coil for obstructions and clean them as needed.

Servicing costs can vary. Generally, air source heat pumps cost between £2,500 and £13,000 for supply and installation. Ground source heat pumps cost between £6,000 and £11,000.

Heat pumps may face issues like electrical failures or broken valves. A professional can replace faulty parts swiftly. Regular checks ensure the heat pump's efficiency and performance.

It's important to be aware of your heat pump's warranty. Most warranties cover parts and labour for a specific period, often ranging between 5-10 years. Regular servicing as per the manufacturer's guidelines can help keep the warranty valid. Age and use can impact a heat pump's reliability. Air-source heat pumps typically last 10-15 years, but proper upkeep can extend their life.

A table of potential servicing costs:


Estimated Cost (GBP)

Filter Replacement

£20 - £50

Duct Repair

£100 - £300

Electrical Repair

£150 - £400

Valve Replacement

£200 - £350

Most repairs are straightforward and don't take much time. Regular maintenance reduces the need for costly repairs and keeps the system running efficiently.

Common Heat Pump Issues

Heat pumps can face a variety of problems that impact their performance. Recognising the signs, understanding the causes, and knowing how to fix these issues are essential for maintaining an efficient heat pump.


Some common signs that a heat pump is malfunctioning include:

  • Not heating or cooling properly: If the heat pump isn't maintaining the desired temperature, this could be a sign of an internal issue.

  • Constant operation: The unit running without stopping could indicate a problem with the thermostat or a refrigerant leak.

  • Unusual noises: Strange sounds like rattling or grinding often suggest problems with the motors or fans.

  • Icing up: Ice forming on the outdoor unit can indicate issues with airflow or refrigerant levels.


  • Dirty filters: Blocked filters can restrict airflow, leading to poor performance and potential damage to the system.

  • Thermostat issues: A faulty thermostat may not correctly signal the heat pump, causing it to run improperly.

  • Refrigerant problems: Low or leaking refrigerant can affect the heat pump's ability to heat or cool.

  • Blocked coils: Debris or dirt on the evaporator or condenser coils can reduce efficiency.

  • Worn-out components: Parts like fans and motors may wear out over time, leading to unusual noises and mechanical failures.


  • Regular maintenance: Changing filters and cleaning coils can prevent many common issues.

  • Thermostat checks: Ensure the thermostat is working correctly and replace it if necessary.

  • Refrigerant management: Check for refrigerant leaks and recharge if needed, but this requires professional help.

  • Clear debris: Remove any leaves, dirt, or other debris from around the outdoor unit to ensure proper airflow.

  • Professional inspection: For serious issues, such as electrical problems or motor malfunction, seek expert assistance to evaluate and repair the unit.

Keeping an eye on these signs, understanding their causes, and taking the appropriate action can help extend the lifespan of a heat pump and ensure it runs efficiently throughout the year.

Heat Pump Repair Costs UK 2024

Heat pump repair costs in the UK can vary based on the type of repair needed. Minor repairs typically cost between £500 and £600. Larger, more complex repairs can reach up to £2,000.

Regular servicing is crucial for maintaining heat pump efficiency and longevity. Annual servicing costs usually range from £100 to £150. Investing in regular maintenance can help identify potential issues early, preventing expensive repairs later.

Homeowners should also be aware of the warranties that come with their heat pumps. Many manufacturers offer warranties that cover parts and labour for a certain number of years. It's important to understand the terms of these warranties to avoid unexpected repair costs.

Here’s a quick overview of typical costs:


Cost Range

Minor Repairs

£500 - £600

Major Repairs

Up to £2,000

Annual Servicing

£100 - £150

In some cases, repairs might not be covered under warranty if they are due to improper use or lack of maintenance. Homeowners should keep servicing records to ensure warranty claims are valid.

To summarise, regular maintenance and understanding warranties can help manage and potentially reduce heat pump repair costs. It's essential to budget for both minor and major repairs to keep the heating system running efficiently throughout its lifespan.

DIY Heat Pump Fixing

Regular maintenance of a heat pump is essential to keep it running efficiently. Homeowners can perform simple tasks to maintain their heat pumps and avoid costly repairs.

Air Filters:

Clean or replace air filters monthly. Clogged filters restrict airflow, reducing the system's efficiency.


Ensure the outdoor unit is free from debris such as leaves, dirt, and grass. Use a soft brush or a vacuum cleaner to remove any buildup.

Check Thermostat:

Ensure the thermostat is functioning properly. If it doesn't seem right, try cleaning it or replacing the batteries.

Elevate the Unit:

Make sure the heat pump is elevated 4 to 8 inches above ground level. This helps prevent ice buildup and ensures proper drainage.

Common DIY Fixes

1. Checking Airflow:

Ensure that registers and vents are not blocked.

2. Resetting the System:

Turn off the power to the unit for a few minutes and then turn it back on to reset the system.

3. Inspect Ducts:

Look for signs of wear or damage in the ductwork. Sealing any gaps can improve efficiency.

Tools Needed:

  • Screwdriver

  • Soft brush

  • Vacuum cleaner

  • Replacement filters

They should always consult the manual and, if uncertain, contact a professional. Regular maintenance and an annual check by a qualified technician are essential for optimal performance. Following these tips can help keep the heat pump in good working order throughout the year.

When to Call a Professional Heating Engineer

It's important to know when to call a professional heating engineer for your heat pump. While many minor issues can be handled at home, some situations require expert intervention.

1. Annual Maintenance Check

An annual maintenance check by an MCS certified installer is essential. They ensure the system runs efficiently and address any potential problems early.

2. Unusual Noises

Strange sounds, such as banging or screeching, indicate a problem. A professional can diagnose and fix the issue.

3. Electrical Problems

Heat pumps rely on electricity. Any electrical failures, like the system not powering on, should be handled by a skilled technician.

4. Reduced Efficiency

If your heat pump isn't heating or cooling effectively, it might be time for a professional inspection. They can check for issues like refrigerant levels or system blockages.

5. Persistent Fault Codes

Modern heat pumps display fault codes when something is wrong. If a reset doesn’t clear the code, a professional should be called.

6. Installer Recommendations

Always follow the manufacturer's or installer's maintenance guidelines. These usually recommend periodic professional inspections to keep the system running smoothly.

By knowing when to call a professional, you can ensure your heat pump remains in good working order and avoid costly repairs.

What is a Heat Pump Service?

A heat pump service involves maintaining and checking the components that keep the system running efficiently. Regular servicing helps to avoid breakdowns and prolong the lifespan of the unit.

Key tasks in a heat pump service:

  1. Cleaning the Heat Exchanger Fins: Dust and debris can accumulate on the fins, reducing efficiency. These are cleaned carefully with a brush, especially if the unit is near trees.

  2. Inspecting and Cleaning Filters: Magnetic particle filters trap contaminants. These need to be removed and cleaned. Air filters are also checked and cleaned or replaced.

  3. Checking Refrigerant Levels: Ensuring the refrigerant levels are correct is crucial for optimal performance. Low refrigerant can cause the system to work harder, increasing energy costs and wear.

  4. Examining Electrical Connections: All wiring and connections must be inspected for damage or wear. Loose or faulty connections can cause malfunctions or pose a safety risk.

  5. Testing the Thermostat: The thermostat is tested for accuracy to ensure the system is heating or cooling as expected. An accurate thermostat helps maintain a comfortable indoor environment.

Typical outcomes of a heat pump service:

  • Improved Efficiency: Clean and well-maintained components help the system run smoothly, reducing energy consumption.

  • Extended Lifespan: Regular checks prevent major issues, helping the heat pump last longer.

  • Enhanced Performance: A serviced heat pump performs better, providing consistent heating or cooling.

Routine services are recommended annually. Some warranties may include a free annual service, depending on the manufacturer. Regular maintenance not only ensures efficiency but also keeps the system under warranty.

How Much Is a Heat Pump Service?

The cost of a heat pump service in the UK can vary widely. It depends on factors like the type of heat pump and the service provider.

Typical Costs:

  • Standard Service: £100 to £200

  • Comprehensive Service: £200 to £400

Factors Influencing Cost:

  • Type of Heat Pump: Air source heat pumps are generally less expensive to service compared to ground source heat pumps.

  • Service Provider: Prices can differ based on the company's rates and location.

  • Service Frequency: Annual services are common, but some systems may need more frequent checks.

Example Pricing:

  • Air Source Heat Pump: Approximately £150 for a basic service.

  • Ground Source Heat Pump: Around £250 for a thorough service.

Additional Costs:

  • Replacement Parts: Extra charges apply if parts need replacing.

  • Emergency Call-Outs: Higher fees for urgent repairs or servicing outside regular hours.

Regular servicing helps prolong the life of heat pumps and ensure they run efficiently. Many service plans also offer discounts for long-term contracts or multiple services.

Regular maintenance, though an added expense, can prevent costly repairs and inefficiencies in the long run. Frequent servicing ensures your heat pump operates at its best, providing both environmental and economic benefits.

What Does a Heat Pump Service Include?

Servicing a heat pump is essential to keep it running efficiently. Regular servicing ensures the system works properly and can extend its lifespan.

Inspection and Cleaning

A qualified technician will inspect and clean various parts of the heat pump:

  • Filters: Clean or replace dirty filters to improve airflow.

  • Coils: Ensure coils are free from dust and debris.

  • Fans: Check and clean the fan blades for smooth operation.

System Checks

Technicians will perform several checks to ensure the system is functioning correctly:

  • Refrigerant Levels: Verify and adjust the refrigerant to optimal levels.

  • Thermostat: Ensure the thermostat settings are accurate and responsive.

  • Electrical Connections: Tighten any loose connections and inspect for wear and tear.

Performance Evaluation

A heat pump service also includes a performance evaluation. This involves:

  • Temperature Testing: Measure the output temperature to ensure the heat pump is heating and cooling effectively.

  • Efficiency Check: Assess the overall efficiency of the system to ensure it is meeting performance standards.

Lubrication and Adjustments

Technicians will lubricate moving parts to reduce friction and wear. They may also:

  • Adjust Belts: Tighten or replace if necessary.

  • Calibrate Controls: Ensure all controls are working correctly and efficiently.

Safety Inspections

Safety is a priority during a heat pump service. This includes:

  • Leak Detection: Check for any refrigerant leaks.

  • System Integrity: Inspect the overall integrity of the system, looking for potential hazards.

Regular servicing helps maintain the efficiency and reliability of a heat pump. This ensures that it operates safely and effectively throughout its lifespan.

How Long Does a Heat Pump Service Take?

Servicing a heat pump is essential to ensure it runs efficiently and lasts longer. The duration of a heat pump service can vary depending on several factors.

A standard service for an air source or ground source heat pump usually takes about 1 to 2 hours. This includes checking the system, cleaning filters, and making any necessary minor adjustments.

If the service technician discovers any issues, repairs might extend the service time.

Some common tasks during a heat pump service include:

  • Inspecting the outdoor unit

  • Cleaning or replacing air filters

  • Checking refrigerant levels

  • Inspecting electrical connections

  • Testing the thermostat

When a heat pump service involves more extensive repairs, it can take longer. For example, replacing components or fixing refrigerant leaks might add several hours to the service.

Scheduled annual maintenance can help reduce the likelihood of extended service durations. Regular check-ups often prevent minor issues from becoming major problems.

For those with a service plan, companies often provide faster and more efficient servicing. This can include priority scheduling and quicker turnaround times.

In summary, while a standard heat pump service typically lasts between 1 to 2 hours, more comprehensive servicing or repairs can extend this duration. Regular maintenance can help ensure the service is quick and efficient.

Heat Pump Versus New Gas Boiler

Exploring whether a heat pump or a new gas boiler is better for your home involves looking at efficiency, costs, and the support available from government schemes. Each option has unique benefits and disadvantages.

Comparison Table (Advantages and Disadvantages of Both)


Heat Pump

New Gas Boiler




Initial Cost

£7,000 to £13,000 (air source)

£1,000 to £3,000

£24,000 to £49,000 (ground source)

Installation Type

Requires good insulation,

Simpler installation, can work

potentially underfloor heating

with existing radiators

Running Costs

Lower energy bills

Moderate running costs

Environmental Impact

Uses renewable energy

Fossil fuel heating


15-20 years

10-15 years

Heat Generation

Slower, low-temp heat

Quick, high-temp heat

Heat pumps are usually more efficient, resulting in lower energy bills. They work best with underfloor heating and well-insulated homes. The higher initial cost can be offset by savings over time. Gas boilers are cheaper to install but rely on fossil fuels and may contribute more to carbon emissions.

UK Government 2024 Heat Pump Grants and Schemes

In 2024, the UK government offers various grants to encourage the adoption of heat pumps. The Boiler Upgrade Scheme provides financial aid to replace gas boilers with heat pumps. It’s a significant incentive, reducing initial costs for homeowners.

The grant amount varies but can cover a substantial portion of the installation cost. Additionally, areas with high power consumption might receive increased funding.

Homeowners can also benefit from other schemes aimed at improving energy efficiency, like grants for loft insulation or underfloor heating. These measures support the efficient operation of heat pumps, making this heating option more accessible and affordable.

Leveraging government schemes can ease the transition from gas boilers to more sustainable heating systems.


Heat pump repair is an essential task to maintain the efficiency of your heating system. Regular checks and maintenance can save energy and extend the life of your heat pump.

The Energy Saving Trust and the Welcome Home to Energy Efficiency Campaign provide useful resources and support for homeowners. Guidance on Energy Performance Certificates and planning permissions ensures compliance with regulations.

Addressing issues with pipework and the gas meter early can prevent larger problems. Heat pump grants are available to support upgrades and replacements, making it easier for homeowners to maintain efficient systems.

Repairs often focus on preparing the system for winter, ensuring optimal performance in colder months. Efficient heat pumps can make a significant difference in energy savings and comfort.

Homeowners should regularly consult professionals to check for any repair needs or potential system upgrades. Proper maintenance will ensure that the heat pump remains a reliable source of warmth and efficiency throughout the year.

Frequently Asked Questions

Can you repair a heat pump?

Yes, heat pumps can be repaired. Common issues like refrigerant leaks, faulty compressors, and electrical problems are often fixable by a qualified technician. Diagnosing the problem accurately is crucial for effective repairs.

What is the major problem of a heat pump?

A major issue with heat pumps can be refrigerant leaks. These leaks reduce efficiency and can damage the compressor over time. Detecting and fixing leaks early ensures the heat pump runs efficiently and prevents costly repairs.

What is the life expectancy of a heat pump?

A well-maintained heat pump can last between 15 to 20 years. Regular maintenance, such as annual check-ups by a professional, helps extend its lifespan. Keeping the system clean and addressing minor issues promptly also contributes to its longevity.

Do heat pumps have to be serviced?

Yes, heat pumps should be serviced annually. A qualified technician will inspect the system, clean components, and ensure it operates efficiently. Regular servicing prevents breakdowns and maintains the heat pump's performance.

How much does it cost to service a heat pump in the UK?

The cost to service a heat pump in the UK typically ranges from £80 to £150. Prices may vary depending on the service provider and the specific needs of your heat pump. Regular maintenance is a worthwhile investment to keep your system running smoothly.

Can you service a heat pump yourself?

While some basic maintenance tasks like cleaning filters and keeping the outdoor unit clear of debris can be done by homeowners, professional servicing is essential for more complex tasks. It ensures the system is thoroughly checked and any potential issues are addressed by an expert.

Stephen Day profile photo
Article by
Stephen Day | Co-founder
Gas Safe registered and FGAS certified engineer with over 20 years experience in the heating and cooling industry.