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Ideal Mini HE C28 - no hot water

Discussion in 'Plumbing and Central Heating' started by Craig Beal, 17 May 2019 at 10:56 AM.

  1. Craig Beal

    Craig Beal

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    Hi,

    My boiler currently doesn’t always fire when hot water is called for.

    CH works fine and fires up as and when asked.

    The Boiler fires up for Hot water if the CH is on or has been on recently but fails to other wise or when the CH has been off.

    When the tap is activated the Red LED on the DHW switch lights up and the system sounds like it primes and clicks as per normal just before the boiler ignites but doesn’t.

    It’s almost as if it’s got getting the go ahead to ignite?

    Any starting points?

    Craig
     
  2. undertrained

    undertrained

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    Probable cause - diverter valve.
     
  3. ericmark

    ericmark

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    I had a problem like that with a bosch boiler, turned out to be kink in the flexible pipe to sink, the tap was simply not turning on enough for the boiler to fire.
     
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  4. Craig Beal

    Craig Beal

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    But it’s not igniting the boiler to heat water in the first place
     
  5. Craig Beal

    Craig Beal

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    The issue is the same regardless of which hot tap in the house is used, so 3
     
  6. undertrained

    undertrained

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    But you said it does whilst heating is on or has been?
     
  7. Craig Beal

    Craig Beal

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    Yes this is true
     
  8. undertrained

    undertrained

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    A few more questions. When did it start or has it always been like this? When the hot water fires up after heating has been on is it actually hot? Is the temperature set correctly?
     
  9. Craig Beal

    Craig Beal

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    It’s in the last week we have noticed it, filling the sink etc in the day but having only had the house 6 months and the first time we haven’t had the CH on as much it could have been a problem the whole time. We normally run showers around the time the heating is on hence not being noticed before.

    When the water fires up after the CH has been on or is on its as hot as we set it so doesn’t seem to be a problem with that aspect.

    Almost feels like the boiler isn’t getting the go ahead to ignite despite being told to. Having looked last night when hot water is called for the DHW valve goes red led, then a pin pushes a micro switch which I assume should then send a signal to the PCB to fire the boiler as it’s confirmed there is a request for hot water and flow of water.
     
  10. dilalio

    dilalio

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    Plenty of threads on this forum alone, regarding this issue with this boiler.
     
  11. Craig Beal

    Craig Beal

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    Having read all of them fully non of them seem to pin point the issue or state what the resolve was hence me having to start my own thread :/
     
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