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Boilers not switching off

Discussion in 'Plumbing and Central Heating' started by Christiano, 21 May 2021.

  1. Christiano

    Christiano

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    Hi all,

    I have 2 combi boilers operating on a single heating system, controlled by a Hive.

    Intermittently, one or other boiler doesn’t switch off when they’re supposed to; should I be looking for a bad connection somewhere?

    Thanks!
     
  2. muggles

    muggles

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    Need much more info about the controls setup. Is it just one Hive controlling both boilers?
     
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  4. Christiano

    Christiano

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    Yes, one hive, both boilers which are Alpha CB24 with the water side out of use.
    It’s further complicated by having an input from a Resol controller/iBoost buddy to switch the boilers on to heat if we didn’t get enough hot water from solar during the day. This bit rarely gets used but as a result there’s a box of spaghetti wiring between the hive and boilers.

    Unfortunately the installer passed away a couple of years ago but at least I have a folder of useful info such as wiring diagrams.

    i wanted to try to get my head around it a bit better and know whether it’s something I can’t fix myself
     
  5. ianmcd

    ianmcd

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    so are you saying you have an Alpha solar smart sytem and Cylinder ?, pics would be best of your set up if possible
     
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  7. Christiano

    Christiano

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    Thanks; it’s a bespoke solar setup, just the 2 Alpha boilers. Looks like the problem may be with a zone valve, each boiler has one to divert from heating to the hot water cylinder.
     
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