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  1. H

    Central heating comes on unwantedly when hotwater tank heats

    Hi Dan, thanks for your response. The valve is a "Honeywell 40003916-003 replacement powerhead for V4073A mid-position valves". I assume (and may be wrong) that this valve is meant to stop water flowing into the radiator system when the the hot water tank is being heated. It's got a manual...
  2. H

    Central heating comes on unwantedly when hotwater tank heats

    Not what I need in the summer! When the domestic hot water is heated all the radiators in the flat heat up. There is a shared water pump and an electronic valve in the system which I suspect is at fault. Is there a way to diagnose it?
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