Worcester Boiler Heatslave 20/25 Hot Water Not Working

Discussion in 'Plumbing and Central Heating' started by poggibonsi, 15 Aug 2020.

  1. poggibonsi

    poggibonsi

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    Hey there,

    I have a boiler (Heatslave 20/25) that had low pressure. I topped the pressure back up to 1 bar using the external filling pipe but the hot water still won't come on.

    Do I need to reset anything?

    Thanks for any help
     
    Last edited: 15 Aug 2020
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  3. ianmcd

    ianmcd

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    your boiler has an overheat thermostat, it may have operated with the low water content, press it in if you feel a click that is you back up and running.
     
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  4. poggibonsi

    poggibonsi

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    Thanks Ian, tried that, no luck unfortunately. There was no click when I pressed it so presume it had not tripped, any other ideas?

    Cheers for the help.
     
  5. ianmcd

    ianmcd

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    Take the pressure up to 1.5 Bar sometimes a little but of grit can get into the low water pressure switch and you need a little bit more pressure to get it to make, what lights are on , on the control panel ?
     
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  6. CBW

    CBW

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    Confused slightly. Heating will not come on? Check the room thermostat is up fully, and the temperature where it’s located isn’t higher than that of the required heat.
     
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  7. poggibonsi

    poggibonsi

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    Thanks Ian - just filled up to 1.5 bar, no luck.

    Control Panel - Power Light - On, Lock Out - Off, No HW Light - when I press the button does not come on, although it is set to on.

    Cheers
     
  8. poggibonsi

    poggibonsi

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    Apologies Chris - should have been hot water - edited
     
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  9. CBW

    CBW

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    I don’t work on or understand much about oil combi’s, but it mentions in instructions about pumping water to heatslave tank? And has the boiler been allowed to cool?
     
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  11. poggibonsi

    poggibonsi

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    Thanks - will allow the boiler to cool, presuming a few hours should be ok...then I'll try the procedure as per the instructions to pump water to the heatslave tank.
     
  12. ianmcd

    ianmcd

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    Does the CH work ?
     
  13. poggibonsi

    poggibonsi

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    Yep Ian - it does, all good on that front.
     
  14. ianmcd

    ianmcd

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    post a pic of any controls you have and of the boiler control panel too, can only be a control fault or DHW flow switch fault, does cold water actually come out of the hot tap when opened ?
     
  15. oilhead

    oilhead

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    Is the manual lever on the diverter valve floppy? If yes, switch off all power to boiler. If it still remains floppy then the motor is jammed and needs replacing.
     
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  16. poggibonsi

    poggibonsi

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    Cheers - I've attached a picture of the control panel and normally the light circled in red would be on.

    Yes, currently cold water comes out of the hot water tap when turned on.
     

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  17. poggibonsi

    poggibonsi

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    The manual diverter valve lever is not floppy and is currently set in the up position.
     
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