Why are two of my radiators not heating up?

Question

My other radiators work fine, but two stay cold even when the heating’s on

Rob · Answer

Could have air trapped in them. Try bleeding those 2 radiators to remove the air. Close off all radiators and only have one of them open, then try the other radiator to see if they heat up. You could have a blockage affecting those if in same part of property.

Stephen · Answer

It could be air or a blockage or even the thermostat pins might be stuck

Billy · Answer

First off, bleed the radiators, then it's Either the valve is closed or the pin on the thermostatic valve is stuck down to the off position.

Tracy · Answer

The pin inside the thermostats could be stuck in the off position. Try unscrewing the head and giving the pin a tap with a hammer.

Sina · Answer

The radiators either need bleeding or sometime your radiator valves have seized up and would need replacing.
If you do both of these and still have issues you’ll most likely need to do a powerflush

Dan · Answer

Possible issue with either: air in the system, this can be resolved by bleeding the system
Or radiator valves could be partially closed or blocked

Sam · Answer

Air trapped in the radiators

Symptoms: The radiator feels cold at the top but warm at the bottom.

Fix: Bleed the radiator using a radiator key to release trapped air. Make sure the heating is on while doing this, and have a cloth to catch drips.

Shane · Answer

This could be a couple of reasons.
There could be air in them.
Thermostatic valves on tbe rads are faulty/ stuck.
Have you checked the valves are open?
Also coukd be sludge build up inside radiator or pipework.

Why are two of my radiators not heating up?

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