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No hot water...advice & help needed please

Discussion in 'Plumbing and Central Heating' started by dazzystar, 10 Jul 2012.

  1. dazzystar

    dazzystar

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    Hi all,

    HW light is on on the programmer yet the boiler (Potterton Prima F) does not start up. If I turn the CH on on the programmer the boiler fires up without problems. I can hear the HW zone valve opening and closing if I turn the HW on and off from the programmer.

    I've having to use the immersion for HW which costs a ruddy fortune and of course the rad in the bathroom is cold so no dry towels!

    Does anyone know what could be causing the problem?

    Cheers
    Daz
     
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  3. craig51

    craig51

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    If the motor is moving, then either the Microswitch is buggered therefore not send power down to the boiler, or, the permanment live is buggered.

    I would go with the microswitch my self.
     
  4. dazzystar

    dazzystar

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    Thanks for the reply. If there was an issue with the permanent live wouldn't that also affect the CH?

    Is there a way of me manually testing?
     
  5. craig51

    craig51

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    Each valve has its own permanent live, so the pl going to the h/w valve might not be good, but this is unlikely all else being equal.

    If you had a multimeter, you could test the m/switch.
     
  6. dazzystar

    dazzystar

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    Here's a quick update. I've managed to use a wooden skewer to press down on the micro switch and I can confirm that it starts the water pump but the boiler still refuses to light.

    As I understand it there is only one cable which sends the signal to the boiler to start up and the fact that it does start when I turn on the CH would indicate that that cable is fine.

    What else could be causing the problem?

    Cheers
    Daz
     
  7. dazzystar

    dazzystar

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    anyone?
     
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