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Boiler not firing for heating ok for water

Discussion in 'Plumbing and Central Heating' started by Helptav, 29 Sep 2021.

  1. Helptav

    Helptav

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    Hello all. As per title. Traditional set up tanks in the roof hot water cylinder 18kw boiler with filter. Has happened before but mostly comes on instantly. Yesterday for first time our heating didn't want to come on for ages. Only thing I think if is to change the head of the 3 way diverted valve thoughts please? Came on in the end and seems ok (for now) thanks Paul
     
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  3. Helptav

    Helptav

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    Hello all. Tried this morning water comes on perfect when using programmer how ever heating does come on but takes a good 5 mins to fire up boiler thoughts? thanks
     
  4. terryplumb

    terryplumb

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    3 port valve issue most likely. Can you use a multimeter to check wiring at the wiring centre ?
     
  5. Helptav

    Helptav

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    Thanks terry i dont own a multimeter, however if i replace the full head do you think this will solve me problem ? Thanks for your help Paul
     
  6. terryplumb

    terryplumb

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    It would if the problem is definitely the valve. Checking voltages at the wiring centre would confirm this.
     
  7. Helptav

    Helptav

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    Thanks Terry, :)
     
  8. ianmcd

    ianmcd

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    what time clock and room thermostat do you have ?
     
  9. Helptav

    Helptav

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  11. Helptav

    Helptav

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  12. ianmcd

    ianmcd

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    Thanks the programmer and room stat are pretty reliable, have seen faulty of both but they are pretty good, the zone valve actuator however are bad , as said if you could check the voltages would be best, but my money is on the actuator
     
  13. Helptav

    Helptav

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  14. ianmcd

    ianmcd

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  15. Harry Bloomfield

    Harry Bloomfield

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    If the 3-port actuator is sticking, then I find you can sometimes get them to work by giving them a thump, but only until they stick again. If you look at the 3-port and out the make and model - often you can just buy the head/actuator part, which makes it a fairly easy swap - Just a couple of screws and maybe four electrical connections.

    If considering swapping just the head, it's worth checking the valve spindle is free to turn and free from leaks.
     
  16. Helptav

    Helptav

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    Thanks Both :)
     
  17. Helptav

    Helptav

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    One last further question please. I notice the new Drayton ones just push on mines a older 1998 lifestyle one can I fit this to the valve? Thanks Paul
     
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