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Central haeting ok but no hot water

I have a honywell Honeywell V4073A-3way valve. The central heating side works fine butwhen I select HW the the pump runs and the boiler fires up but the water does not appear to be flowing to the tank coil. Does this sugest that the valve is faulty. the valve motor runs when there is a change form ch to hw or vici versaJohn S

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  • John Schlamp
    John Schlamp Jan 02, 2009

    i have a towel rail that is in parrellel with the hot water tank coil and that gets hot with no problems, The valve motor moves ok when switching between central heating and hot water, Is ther a chance that it may be an air lock?

  • John Schlamp
    John Schlamp Jan 04, 2009

    have solved the problem. It was the mechanics between the motor and thw valve shaft jamming up. flush out with WD40. It now works a treat.


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If the valve runs at other times, the valve is OK. you have a relay somewhere that is not sending signal to the valve when in that mode.

Trace down all the relays for that cycle and check voltage going int, coming out, and to see if the coil is enrgised.

Posted on Jan 01, 2009

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