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knowledge sharing - Honeywell 4073A Motorised Valve Problems

Discussion in 'Plumbing and Central Heating' started by projectman, 7 Feb 2012.

  1. projectman

    projectman

    Joined:
    25 Oct 2010
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    Location:
    Surrey
    Country:
    United Kingdom
    Hey folks

    Just thought I'd share a bit of knowledge I've just gained as I always find this forum v useful and informative.

    Hot water and central heating system - hot water was working, tank thermostat switched boiler + pump on when controller was on for HW. So I know the boiler, pump and HW side of the controller were working. However when CH was on + thermostat on the pump + boiler didn't kick in. Weird.

    (I guess you professionals would have diagnosed this already..)

    However when I manually pushed the 4037A valve to open, the CH (pump + boiler) started up. Let it go and it stopped.

    Phoned up Honeywell as I suspected the 4047A wasn't working. They asked me to check whether the white and grey to the valve were live, and they were, then with thermostat on + controller on, the orange/red should also be live but it wasn't. Suggested replacing just the motor inside the Honeywell.

    5 minutes later I'm down the plumber's merchants £10 for new motor, fitted it, all works fine now.

    So I'm chuffed, and saved a load of dosh.

    However when I think back, a couple of days previously I had increased the boiler temperature to max to get the radiators a bit hotter. This must have caused the 4073 to overheat, as when there is a call for CH it is holding the valve open constantly, drawing 6W of power.

    So to prevent it happening again, I (a) turned the water temperature down a bit, and (b) driller loads of holes in the top of of the new motor and Honeywell cover to allow the heat to escape. Job done fingers crossed.

    cheers

    Graham

    :D :D
     
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  3. 75pete

    75pete

    Joined:
    9 Apr 2008
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    Location:
    London
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    United Kingdom
    Yes, good bit of info.
    Pete
     
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