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gledhill boilermate II heating on all the time!!!!?

my boilermate II heating just came on last night and wont switch off even with timer off. Any ideas?????????
Tom, July 2010
Seems to be letting by heating valve. Usually due to port been held open supply from faulty ACB, or under extreme circumstances, scale in valve port.

WELCO, March 2011
Check timer output when off. Otherwise valve letting by. If you need help visit WELCOUK.COM. Good luck.

WELCOUK.COM, July 2010