Underfloor Heating Fault Diagnosis
Underfloor heating can fail for several reasons, from a stuck actuator or air in the circuits to pump, control, or balancing problems. This fault diagnosis service is designed to identify the root cause of issues in wet underfloor heating systems, so you can make an informed decision on the most effective repair or adjustment.
More information
What the diagnosis covers
A structured check of the key components that affect heat output, flow, and control. The goal is to move from symptoms to a clear, practical answer.
- Review of symptoms and system layout (zones, manifold, controls)
- Visual checks for leaks, corrosion, damaged valves, and obvious installation issues
- Manifold inspection: flow meters, isolation valves, air vents, and return temperatures
- Pump and circulation checks where applicable
- Zone operation checks: actuators, thermostats, wiring centre, and control signals
- Pressure and airlock investigation (common cause of cold loops)
- Basic system balancing assessment to improve even heat across rooms
- Clear explanation of findings and recommended next steps
When this service is most useful
Book a diagnosis if:
- One room or zone is cold while others work
- The system takes far longer than usual to warm up
- Floors feel patchy, with hot and cold areas
- Thermostats call for heat but nothing changes at the floor
- You have frequent pressure drops, topping up, or repeated air in the system
What to expect during the visit
The engineer will ask a few questions about the fault history, recent changes, and how the system is controlled. Tests then focus on the manifold, pump, and controls to confirm whether the issue is flow related, control related, or linked to a specific circuit. Where access allows, checks are kept as non disruptive as possible.
After the diagnosis
You will be talked through what was found in plain English, with options to resolve it. If a repair is needed, you can expect a clear scope of work, likely parts required, and any follow on improvements such as rebalancing or control adjustments to prevent repeat problems.