Heat Pump Repair - 2026 Guide

When a heat pump needs repair

Heat pumps are designed to run for long periods with minimal intervention, but faults can still occur.

Changes in performance are often the first sign that something is not working as it should.

A repair may be needed if heating output drops, hot water becomes unreliable, or the system behaves differently to normal.

Even small changes are worth paying attention to, especially during colder months when demand is higher.

Signs your heat pump is not working properly

Common signs include rooms taking longer to heat, radiators or underfloor heating not reaching temperature, or hot water running out sooner than expected.

Some homeowners notice higher electricity use alongside reduced comfort.

Visual indicators such as warning lights or on screen error messages are also important.

These usually mean the system has detected a fault that needs checking.

Issues that should not be left unresolved

Problems linked to electrical safety, repeated system shutdowns, or pressure warnings should always be addressed quickly.

Continuing to run a faulty heat pump can increase wear on components and lead to more costly repairs later.

Common heat pump problems explained

Most domestic heat pump repairs relate to a small number of recurring issues.

Understanding these issues helps set expectations before speaking to an engineer.

Heat pump not heating your home properly

Poor heating performance can be linked to incorrect settings, low system pressure, blocked filters, or internal faults.

External factors such as cold weather can also highlight underlying issues that were previously unnoticed.

Unusual noises or vibrations

Some background noise is normal, especially from the outdoor unit.

However, new rattling, buzzing, or grinding sounds may point to loose components, airflow problems, or mechanical wear.

Heat pump switching on and off frequently

Frequent stopping and starting is known as short cycling.

This can reduce efficiency and increase strain on the system. It is often linked to sensors, controls, or system balance issues.

Error codes and warning lights

Modern heat pumps display fault codes when something is wrong.

These codes help identify the issue but usually require a qualified engineer to diagnose and resolve properly.

Common heat pump faults

Can a heat pump be repaired or does it need replacing?

In many cases, heat pump problems can be repaired without replacing the entire system.

When a repair is usually possible

Repairs are commonly suitable where the system is relatively new, well maintained, and the issue is limited to one component.

Air source heat pumps are designed to be serviceable, with parts that can be replaced if needed.

When replacement may be recommended

Replacement may be considered if the system is approaching the end of its lifespan, has recurring faults, or no longer meets the needs of the home.

Other types of heat pumps exist, but air source systems are the most widely used in UK properties.

What you can safely check before calling an engineer

There are a few checks homeowners can make safely before arranging a repair.

These do not involve opening the system or adjusting technical settings.

Safe homeowner checks

If the problem continues after these checks, professional repair is recommended.

Heat pump repair costs in the UK

The cost of repairing a heat pump depends on the type of fault, the parts required, and the time needed to complete the work.

As a general guide, UK homeowners in 2026 may expect average repair costs to fall between £150 and £600.

More complex faults involving major components can cost more. Engineers will normally assess the issue and confirm costs before proceeding.

Do heat pumps need servicing to avoid repairs?

Regular servicing helps keep heat pumps operating efficiently and reduces the likelihood of unexpected faults.

How regular servicing helps prevent faults

Servicing allows early detection of wear, airflow issues, or control problems. Addressing these early can prevent breakdowns and extend system life.

What a typical heat pump service includes

A service usually involves checking filters, controls, electrical connections, pressure levels, and overall system operation. This helps ensure safe and reliable performance.

Heat pump repair in the UK

Why qualified engineers are important

Heat pumps combine electrical, mechanical, and refrigerant systems.

Repairs should only be carried out by trained professionals to ensure safety and compliance.

Safety, warranties, and manufacturer requirements

Unqualified work can affect warranties and system reliability.

Using qualified engineers helps protect your home and your heating system.

How iHeat can help

iHeat installs air source heat pumps for UK homeowners and provides clear guidance on how modern systems are installed, used, and maintained.

If you are researching air source systems or want to understand how heat pumps work in practice, iHeat offers straightforward information designed to support informed decisions.