Hot pipes but radiators only warm

Question

The pipes supplying my radiators are hot, but the radiators themselves aren't - they're simply warm. What's the likely cause?

Victor · Accepted Answer

The radiators are full of sludge... Lack of inhibitor in the system and I assume you don't have any central heating filters either, that way you have this situation now, power flush, or magna cleanse will help to solve this or if you want take the radiators outside and flush it inside with the pressure from the mains

Gary · Answer

Could be a number of thing really pump , sludge , heat exchanger , try having your system flushed add an inhibitor and magnacleanse

Ryan · Answer

Sludge in rads or faulty radiator valves you will need system flushed get a heating engineer out to look at it

Mihai-vasile · Answer

Hi, the most common fault on radiators not getting hot is the air trapped inside of the radiator. This can be removed by bleeding the radiator on the venting valve. Please remember that if you have a pressurized heating system you will need to top up the pressure after each radiator bleeding. 
If there’s no air coming out anymore, and the radiator is not hot then you need to investigate if there’s a clogged system, or blocked valves.

Alistair · Answer

System needs flushing or thermostatic radiator valves need checking.

Regards 
AC heating services

Ryan · Answer

Radiators could be filled with sludge system might benefit with a power flush, have you bled the radiators?

Martin · Answer

Checked there is no air in the radiators by bleeding.
If not could be a balancing problem or sludge in rads that would require cleaning system to remove sludge.

Aaron · Answer

Are both pipes hot each side of the radiator? Sounds like a blockage within the radiator. Either sludge or air. Has the radiator been vented?

Kenneth · Answer

Air in the radiator or one side maybe turned off or blocked

Jason · Answer

Could be sludge in radiators, trv stuck pin or could require balancing

Hot pipes but radiators only warm

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