Heat Pump Fault Diagnosis

What heat pump fault diagnosis covers

This service is designed to move from symptoms to a clear cause, with practical next steps.

• Review of reported issues, fault history and controller settings
• Visual and safety checks on indoor and outdoor equipment
• Electrical checks (where accessible) and assessment of protections and isolators
• Performance testing: temperatures, flow rates and system operation under demand
• Checks of pumps, valves, filters, strainers and obvious restrictions in the hydraulic circuit
• Assessment of hot water cylinder performance and related controls (where fitted)
• Identification of control or commissioning issues affecting comfort and efficiency
• Clear summary of findings and recommended repair or optimisation options

When this service is the right fit

Book fault diagnosis if your heat pump:

• Stops with fault codes or trips electrics
• Runs but does not heat the property properly
• Delivers lukewarm radiators or underfloor heating
• Struggles to make hot water or runs the immersion too often
• Short cycles, defrosts frequently, or runs constantly
• Has noticeably higher running costs with no change in usage

What happens during the visit

You will be asked a few focused questions about symptoms, recent changes, and any error messages. Testing then follows a logical sequence across the heat pump, controls, and heating circuit to narrow down the cause.

In many cases the issue can be confirmed in one appointment. If further testing, parts, or manufacturer input is needed, you will be told what’s required and why.

After the diagnosis

You will receive a clear explanation of what has been found, what it means for comfort and efficiency, and the best next step. If a repair is needed, you can approve the work before anything proceeds.

Where the system is fundamentally sound, you may instead be advised on optimisation, such as control settings and system balancing, to improve comfort and reduce running costs.