Heating System Fault Investigation

What a heating system fault investigation covers

A systematic diagnostic visit to identify the root cause of a heating problem, not just treat the symptoms. Depending on your system and the issues reported, this can include:

• Checks of boiler operation, fault codes and safety shut-down behaviour
• Testing of heating controls (thermostat, programmer, timers and wiring where accessible)
• Assessment of system pressure, circulation and obvious leaks
• Investigation of pumps, motorised valves and zone controls (where fitted)
• Radiator performance checks (for example cold spots, air, flow issues)
• Inspection for signs of sludge, blockage or poor circulation
• Clear explanation of findings and recommended repair options

When this service is most useful

This is the right choice if you need a confident diagnosis before approving repair work, especially when the problem is intermittent or has resisted quick fixes. Common situations include:

• No heating, no hot water, or frequent lockouts
• Some radiators heating up, others staying cold
• Heating that works sometimes, then drops out
• Unusual noises, pressure drops, or repeated need to top up
• Underfloor heating zones not warming as expected

How the investigation is carried out

The visit usually follows a structured sequence so nothing important is missed.

1. Symptom review: what is happening, when it started, and any recent changes.
2. Visual checks: accessible pipework, controls, obvious leaks, and system condition.
3. Testing and fault finding: targeted tests to narrow down the cause, with step-by-step isolation where needed.
4. Findings and next steps: you will be talked through what has been found, what is likely to be required, and what can be done next.

After the investigation

Once the root cause is identified, you can decide how to proceed. You will typically receive a clear summary of the fault and the recommended remedial work, plus any practical advice to reduce the chance of repeat issues (for example system cleaning, control adjustments, or component upgrades where justified).