What causes radiator not heating up?

Air trapped in the radiator needing bleeding. Sludge build-up blocking water flow. Faulty thermostatic radiator valve.

How much does it cost to fix radiator not heating up?

Typical costs range from £446 to £1,450 depending on severity and location. Get a free quote from a local plumber on Tradesfolk.

Fix SoonCommon in SepRecommended trade: Plumber

Radiator Not Heating Up

One or more radiators stay cold or only warm up partially while others in the house work normally.

What Is Causing This?

1Air trapped in the radiator needing bleeding
2Sludge build-up blocking water flow
3Faulty thermostatic radiator valve

How Urgent Is This?

Fix Soon

This should be fixed in the coming weeks. Leaving it may allow the problem to worsen and cost more to repair.

What Needs to Be Done

A plumber will bleed the radiator, check the valve, and if needed, flush the system to remove sludge. In some cases the radiator or valve will need replacing.

How Much Will It Cost?

£446 – £1,450

National average estimate

Labour: £246 – £620 | Materials: £200 – £830

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Prices are estimates based on typical UK rates. Actual costs depend on the specific issue, accessibility, and your location. All quotes from tradespeople on Tradesfolk are completely free.

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How to Prevent This

Bleed radiators at the start of each heating season. Consider adding a magnetic filter to your system to catch sludge. Have a powerflush done every 5 to 10 years.