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What usually makes radiators not heat up after bleeding?

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The most common reason for hot water radiators to not heat up after bleeding is the presence of malfunctioning of thermostatic radiator valves or TRVs. Typically, a stuck TRV pin can cause the issue.

To work out if that is the case, remove the head off the valve and identify the exposed pin, then check that it isn’t stuck in a closed position and stopping water from entering the system. If it is stuck, pliers or a spanner will be needed to grab the pin and move it up and down to loosen it, and allow water to flow back into the radiator as required.

For further information, take a look at our blog, Why is my radiator not working after bleeding?