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suprima 30l-100l?

my central heating is constantly on i am an electrician and think the 2 port valve is broken could this be causing the problem
gavin, January 2011
i would check all controls first usually zone valves fail in the open position (electric open not plumbing open) and most are spring loaded so unless it's on manual or the micro switch is faulty i would suspect something else

brian, January 2011