combi boiler problem

Discussion in 'Other discussions' started by abdul.jabbar, Mar 22, 2011.

  1. abdul.jabbar

    abdul.jabbar Member

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    Hi,
    I have a Ideal Isar HE24 combi boiler.

    Both hot water and central heating work ok. But when the central heating "kicks in" the boiler makes a load whining noise. The vibration/noise seems to be comming from the diverter valve.
    The switch/lever seems to opertae correctly ie when hot water is demanded the switch moves automatically to the correct position and also when central heating is demanded the lever moves to the heating postion..
    The problem is the noise when the central heating is called for..When this happens i can temporarily get rid of the noise by running the hot water tap anywhere in the house for a short time. But when the hot water tap is closed ie turned off after a while the diverter valve moves to the central heating position and the noise comes back..
    Is the diverter valve faulty..
    Is the problem the valve head, the valve behind the head or the manifold..
    Do i need to replace one of these or can i repair the part in question with service bits?
    I have even seen service parts for the valve Do these go in the head or the valve body..Thanks
    The diverter valve is labelled as
    the honeywell vc6012-34 actuator........ 40004797-003
     
  2. Macabre

    Macabre Well-Known Member

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    Sounds like the fan is goosed
     
  3. abdul.jabbar

    abdul.jabbar Member

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    Mate,
    Thaks for the quick reply...
    good thing i did not buy the diverter valve..
    The fan looks easier to replace..
    Is it a replcement that is needed or can it be fixed

    Looking at the manual it looks as if you can remove fan and venyri assembly and clean as part of a service
     
    Last edited: Mar 22, 2011
  4. abdul.jabbar

    abdul.jabbar Member

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    Is the fan not turning or getting stuck?
    during hot water all is well but on central heating radiaters are hot so works but noise..
     
  5. Rick

    Rick Well-Known Member

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    Are you registered to work on that appliance ?

    Changing a wet part on a boiler is one thing, but when you start breaking combustion seals you are putting yourself and your family at risk if you get any part of it wrong. My advice is to make sure whoever repairs your boiler is competant to do it.
     
    Last edited: Mar 23, 2011
  6. Macabre

    Macabre Well-Known Member

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    Like rick said , get someone in who is qualified .

    Sounds like the fan is grinding ( common fault ) and needs to be replaced .
     
  7. abdul.jabbar

    abdul.jabbar Member

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    Thanks for the advice guys.
    No im not registered. Ive got the electrical 2330 level 3 and understand basic diy.

    Only asked just incase it was a very simple fix and did not want to get ripped off.
    Strangely though, yesterday i noticed the hum from one of the radiators and even though i had bled all the raditors without it making difference before.. I fully opened both ends the thermostat and the other side which has improved the noise.
    Previously i thought the hum on the raditers was simlpy the noise from the boiler itself vibrating down the pipe.

    I think i will drain the system and add some cleaner and inhibiter and if this does not work get someone to replace the fan..
    Replacing the fan looks staright forward only a couple of screws according to the manual.
    What would be a resonable price for labour for this job?
     
  8. Macabre

    Macabre Well-Known Member

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    Where do you live mate ??
     
  9. Rick

    Rick Well-Known Member

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    Ask friends and family for a recommendation, even neighbours. That can be a really good way of getting a good tradesman. Without actually examining the boiler we are just taking an educated guess at it being the fan. It could be something much simpler. If you haven't had it serviced in a while, it could well be worth doing when you get it repaired.
     
  10. RayB

    RayB Well-Known Member

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    Be very careful about adding any form of corrosion inhibitor into a system that has not been dosed regularly - it can have an adverse effect on pipes where there are joints and eat away at rust and scale which is often all that holds the joints together!
     
  11. abdul.jabbar

    abdul.jabbar Member

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    Hi,
    Sorry for the late reply but have not been able to visit the forum recently.
    I noticed a little condensation on the inside the pressure which got worse over a few days to a point there was water inside the gauge...
    Luckily for me i did not replace the actuater valve with all its bits or even the fan..
    It turned out to be a 15 pound fan which i replaced.
    All seems ok now..
    Would a qualified plumber been able to spot the problem before the codensation and obvious water in the gauge was apparent..
     
  12. Macabre

    Macabre Well-Known Member

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    Yes he would , and said it was a fan :righton:
     
  13. abdul.jabbar

    abdul.jabbar Member

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    sorry mate my mistake it was not the fan or the diverter valve
    it was the pressure gauge that cost me 15 pounds from ebay..
     
  14. Macabre

    Macabre Well-Known Member

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    Making it scream ?
     
  15. Rick

    Rick Well-Known Member

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    That's a new one on me as well :shocked:
     
  16. abdul.jabbar

    abdul.jabbar Member

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    Does the perssure gauge have a valve that allows hot water through it to measure the pressure and was sticking.
    On hot water there was no no vibrating noise.. I assume on hot water this pressure gauge is not used..
    Good for me that it turned out be be a cheap fix
    Thanks again for all your help
     

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