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Honeywell Sundial y plan 3 position diverter valve

Discussion in 'Plumbing and Central Heating' started by mrhaveago, 8 Jan 2012.

  1. mrhaveago

    mrhaveago

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    hi all wondering if anyone could give me some advice please,,my C/H will only fire up when the Honeywell Sundial y plan 3 position diverter valve is switched to the manual position, Pilot light is on all the time , the system is a baxi very old be grateful for any help ,thankyou
     
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  3. dcawkwell

    dcawkwell

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    New 3 port valve needed. The one you have is stuffed.
     
  4. 45yearsagasman

    45yearsagasman

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    Or maybe just the synchron motor.
     
  5. mrhaveago

    mrhaveago

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  6. mrhaveago

    mrhaveago

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    Thanks,would it be safe to keep the valve in manual position all the time as the boiler will still fire up.....?
     
  7. Agile

    Agile

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    Its safe but the system will not be controlled properly and may use about 10-20% more fuel.

    The obvious solution it to repair it reasonably soon.

    Tony
     
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  9. mrhaveago

    mrhaveago

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    Thanks guys much appreciated..
     
  10. mrhaveago

    mrhaveago

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    so good news the Honeywell Sundial y plan 3 position diverter valve is now working in the auto position and manual,the old baxi boiler is firing hurrah...unfortunatly the radiators are now not heating up,i have tried bleeding them but they were ok...weird...any ideas anyone????please.
     
  11. Agile

    Agile

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    Well you say it works!

    But it does not sound to me as if its working properly!

    Tony
     
  12. Hugh Jaleak

    Hugh Jaleak

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    Still sounds like the valve! It may be open to Hot Water port, and allowing boiler and pump to run, but is not allowing any flow to heating. Maybe possible to repair or a new valve is about £54.
     
  13. mysteryman

    mysteryman

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    Sounds as if the boiler has just responded to a DHW call, but the Synchron motor is shot.
     
  14. MANDATE

    MANDATE

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    Is this a 3port mid position valve or a diverter valve?

    if you are getting any Ch, then the valve must move to mid position so the motor can't be shot.
    I suspect that when HW becomes satisfied when in mid position the valve does not move on to CH only as it should, or if it does move on the boiler does not light.
    The above can be due to a few things
    (a) a stiff spindle
    (b) fault with micro switch No 1 so motor can't continue beyond mid position
    (c) fault with micro switch No2 so even though motor moves to CH position there is no power from 'orange' wire to light boiler.
    A replacement actuator head will cure (b) and (c) and include a new motor.
     
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