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Hi i had the same problem lately and had to shut off radiator at both ends then drain down radiator into tray. I then took out the drain valve and replaced the o ring with a new one and the leaking valve was solved, good luck! mike.

Hi all, my old central heating/ water programmer a landis & Gyr RWB 200 seems to now to of developed some faults especially the boost button. The system runs ok on continious but i think the clock is worn inside (it is now (18 years old). Can anybody reccomend a suitable replacement? I know the...