Underfloor Heating Fault Investigation

What this fault investigation covers

A methodical check of your underfloor heating system to identify what is failing and why, then set out the best route to fix it.

• Confirming system type and layout (wet or electric, zones, controls and heat source)
• Checking thermostats, sensors, programmers and zone settings
• Testing wiring, connections and actuators (where accessible)
• Inspecting the manifold, pump and blending or mixing controls on wet systems
• Assessing pressure, air in the system, flow rates and temperature spread (wet systems)
• Identifying likely causes of uneven heating, slow warm-up, or total heat loss
• Highlighting any safety concerns or urgent issues found during testing
• Providing a clear summary of findings and recommended remedial actions

When this service is most useful

This is designed for situations where symptoms are clear but the cause is not.

• One or more zones are cold, despite the thermostat calling for heat
• Heating is patchy, slow to respond, or overheating in places
• The system works intermittently or trips, alarms, or resets
• You suspect a control issue, a circulation problem, or a problem at the manifold
• You need a professional diagnosis for maintenance planning in a rental or small commercial unit

How the investigation is carried out

The visit starts with a brief review of the symptoms and how the system is meant to operate. Testing then follows a logical sequence, starting with the simplest checks and moving to more targeted measurements to isolate the fault.

Where components are visible and accessible, they will be inspected and tested on site. If the issue appears to be hidden (for example, within the floor), you will be advised on the least disruptive next steps and the options to confirm the diagnosis.

What happens after the investigation

You will receive a clear explanation of what has been found and what it means in plain terms. Where a repair is needed, you will be advised on the recommended fix, alternatives where appropriate, and what to prioritise.

If no immediate repair is required, you will still leave with guidance on settings, balancing, and practical steps to improve performance and reduce the chance of repeat faults.