Recent content by IanBell

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    Central Heating doesn't work unless hot water stat cold

    Looks like time to replace the valve head - fortunately mine is newer type with dimple on cover so it should be straightforward. Many thanks to you all for your help Ian
  2. I

    Central Heating doesn't work unless hot water stat cold

    Blue-Grey = 240v Blue-White = 240v Blue-Orange = nil
  3. I

    Central Heating doesn't work unless hot water stat cold

    Hi Whitespirit66 Thanks for your help No - nothing from orange wire when only CH on.
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    Central Heating doesn't work unless hot water stat cold

    Hi WhiteSpirit66 Thanks for reply Parents uncertain why pump was replaced other than it looked green and old :? The motorised valve and pump are in close proximity and there is slight evidence of corrosion on the valve cover where the slider lever protrudes.
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    Central Heating doesn't work unless hot water stat cold

    Hi Matt Many thanks for reply Yes, I have a multimeter and, as far as I can tell the programmer is delivering power to the correct pins at the correct time. and the cylinder stat appears to be switching between calling for heat and SAT correctly. My understanding stops when it comes to the...
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    Central Heating doesn't work unless hot water stat cold

    Hi Ian Thanks for reply. When I isolate the entire power supply the valve returns to a passive state (sounds like it's clockwork unwinding). As soon as I turn the power back on the valve appears to move to a mid point if cylinder stat is calling for heat but therafter doesn't move at all
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    Central Heating doesn't work unless hot water stat cold

    Hi there. I hope someone here can help. My parents have an oil fired boiler controlled by a Hostmann H27XL programmer a Sunvic SA2452 cylinder stat and a Honeywell V4073A 3 port valve. There is no room stat - all the rads have thermostatic vales. Recently the pump was replaced and, possibly...
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