Radiator not getting hot at all
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Most likely cause & what to check
Check both valves on the radiator are open — the lockshield valve and the TRV or manual valve.
For TRVs: check the number setting isn't at 0 or frost symbol. Turn to 3 or 4.
TRVs can seize in summer — remove the TRV head and free the pin beneath with a screwdriver.
Try bleeding the radiator in case there is an airlock.
If still cold despite both valves open, the issue may be with the pump or a closed zone valve.
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