Cold Radiator Investigation

What a cold radiator investigation covers

If one radiator is cold, several are lukewarm, or rooms heat unevenly, the issue is often on the distribution side of the system. This service is designed to pinpoint the fault and recommend the right fix.

It can cover:

• Radiator valves and thermostatic radiator valves (TRVs) that are stuck, incorrectly set, or not opening fully
• Balancing radiators to improve flow and even out heat across the system
• Air locks, pressure issues, or poor circulation affecting one or more radiators
• Pump operation and signs of inadequate flow
• Pipework restrictions, blockages, or incorrect connections
• Basic control and zoning checks where they affect radiator heat-up
• Evidence of sludge or debris, with advice on cleaning options if needed

When this service is most useful

• One radiator stays cold at the top, bottom, or all over
• The radiator only warms up when others are turned off
• Upstairs radiators heat, downstairs stay cool (or the other way round)
• New radiators or valves have been fitted but performance is poor
• Heating takes a long time to warm up or never feels even room to room
• You want a clear diagnosis before approving any larger remedial work

What to expect during the visit

The engineer will ask about the symptoms, when they started, and any recent work on the system. They will then test likely causes in a logical order, checking radiator settings, valve function, circulation, and system behaviour.

Where appropriate, they may make minor adjustments on the spot, such as bleeding and balancing, to confirm the fault and improve performance. You will be told what has been found, what has been done, and what options remain if further work is required.

After the investigation

You will receive clear next steps based on the diagnosis. This may include a targeted repair, replacing a faulty valve, rebalancing additional radiators, or recommending a clean if contamination is affecting flow.

If remedial work is needed, you can expect straightforward explanations of the options, likely outcomes, and what is most cost-effective for your property.