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Vaillant 242 Turbomax hot water intermittent

Discussion in 'Plumbing and Central Heating' started by primetime, 16 Jul 2016.

  1. primetime

    primetime

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    The hot water for the shower doesn't always come on but is ok for the other hot water taps - basin and kitchen sink. The shower has the lowest flow rate.
    I suspected the diverter valve diaphragm but there were no splits or tears. I replaced the diaphragm and everything else that came in the diverter service kit. The hot water seemed ok for a few days but has gone back to being intermittent.
    The microswitch doesn't seem to operate the times the DHW doesn't come on despite re-adjustment.
    The Central Heating radiator supply pipe also gets warm for a little way (heating not on) when the DHW runs for a little while.
    Replacement of entire diverter required?
     
  2. hertsboilers

    hertsboilers

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    Yes, whole valve time.
     
  3. Bunnyman

    Bunnyman

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    Yes 011289 is what u need
     
  4. primetime

    primetime

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    Thanks. I had another go at adjusting the microswitch. Seems ok for now.
     
  5. hertsboilers

    hertsboilers

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    So you will still get warm radiators when you fill your bath.
     
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  7. primetime

    primetime

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    Rads not getting warm, just a short section of the supply from the diverter.
     
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  8. Bunnyman

    Bunnyman

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    Well you asked for advice mate, just change the valve, i know its expensive but u will do the same as many professionals, fanny around convincing urself it seems ok, the problem is there
     
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  9. primetime

    primetime

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    I appreciate the advice. I got to the same conclusion but wanted to hear it from someone with more experience or if there something else that could be done. Not saying I won't replace it but in no rush just yet. Have sourced a new diverter assembly. Thanks again.
     
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  10. Agile

    Agile

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    I have successfully adjusted the switch in a few cases. But I also agree that on that model its better replacing the whole valve.

    Tony
     
  11. AGAS

    AGAS

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    don't be like some wally's on here who don't take the advice from someone who knows what their talking about with vaillants ( bunnyman ) , because if you go the cheap way you will only spend ( cost & money ) much more in the end .

    there are plenty of examples on this forum
     
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