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no central heating after draining and refilling

Discussion in 'Plumbing and Central Heating' started by stephent123, 18 Sep 2011.

  1. stephent123

    stephent123

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    I have a powermax 155x (vented)

    I installed some TRV's to some downstairs rads today. Drained the system and installed them, all seemed great. Refilled the system and bled all rads.

    Tried to turn the CH on and it didnt work. The light is on on the programmer, the CH pipe to the pump is hot (to and after the pump) and I can still get hot water by turing the HW to constant. I cant get it using the programmer on its own.

    I hope its not the programmer thats shot as i replaced it around 18 months ago. But surely draining the system wouldnt affect this?

    The thermostat light will not come on downstairs. It clicks, but no light. As it clicks i am guessing its still working.

    Any advice would be really helpful, as I am totally stuck. I am sure its something fairly simple that i have or havent done.
     
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  3. 45yearsagasman

    45yearsagasman

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    There is a cold start stat that prevents the ch working until the stored water temp gets to approx 65 deg C.
     
  4. stephent123

    stephent123

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    Its not that, the water has heated up sufficiently.

    could an airlock prevent the light from coming on on the thermostat?
     
  5. flameport

    flameport

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    No.

    However if the thermostat indicator is not working, this suggests either there is no power reaching the thermostat, or the thermostat itself is broken.
     
  6. stephent123

    stephent123

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    I am sure its the programmer.
     
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  8. misterdubya

    misterdubya

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    Why? Have you tested it?

    If your sure, then bypass it.
     
  9. stephent123

    stephent123

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    How would I bypass it? I am not a plumber by the way. You probably guessed mind lol.
     
  10. flameport

    flameport

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    What programmer is it?

    Typically it would be bypassed by switching the power off, removing the programmer from the backplate and installing a wire link between live and the CH ON terminal.
     
  11. stephent123

    stephent123

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    standard built in one.
     
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