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Can anyone help me please! Our Vaillant Eco Tech Plus boiler constantly comes on and off due to going into anti- cycling mode. The radiators are warming up but not enough to warm the house. Please help! Hot water is fine thankfully.

Can someone please tell me how to do this! The pin in the valve has stuck which means we have one cold radiator. The rad had been bled of air so we know that the problem is with the TRV. I am having difficulty removing the valve cover on the left side of the radiator to gain access to the pin...