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Alpha cd35c intermittant hot water (pulsing)

Discuss Alpha cd35c intermittant hot water (pulsing) at UK Plumbers Forums; HI Im having problems with the above boiler ! ch heating is fine but the hot water is hot cold hot cold etc whenever the dhw tap is on, i ...
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    Default Alpha cd35c intermittant hot water (pulsing)

    HI
    Im having problems with the above boiler !
    ch heating is fine but the hot water is hot cold hot cold etc whenever the dhw tap is on,
    i was told it was a simple fix involving the diverter valve diaphram BUT i looked in there and looking at it its not the conventional valve we all know are these known for failing? . Is there anything else it could be ie flow switch etc
    Im also looking at a scale reducer (pre boiler) are the aqua-dial scale inhibitors any good??
    Many thanks for looking

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    Default Re: Alpha cd35c intermittant hot water (pulsing)

    Either a blocked hw heat exchanger and temp sensor, as you have found out - they have no diaphragm and wont be divertor or motor either for this fault!

    My money is on the DHW heat exchanger.

    Is the boiler is under manufactures guarantee?
    Need an Alpha boiler repair or a service? If you're in Kent then give Alpha man a call to arrange a visit. Telephone 01233 712994, Steve, of Greenside Heating Services, GSR number 296.
    Sorry, no free technical advise given to the public either over the Internet or telephone.
    I will only visit if you're in KENT

    (I'm not Alpha nor work for them, just an Independant engineer.)

    Steve

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    Default Re: Alpha cd35c intermittant hot water (pulsing)

    My money is on the DHW heat exchanger. ooooooooooo crap

    Is the boiler is under manufactures guarantee? i think so

    many thanks

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    Default Re: Alpha cd35c intermittant hot water (pulsing)

    Phone Alpha and find out if your still under guarantee!! may not cost you a penny??
    Need an Alpha boiler repair or a service? If you're in Kent then give Alpha man a call to arrange a visit. Telephone 01233 712994, Steve, of Greenside Heating Services, GSR number 296.
    Sorry, no free technical advise given to the public either over the Internet or telephone.
    I will only visit if you're in KENT

    (I'm not Alpha nor work for them, just an Independant engineer.)

    Steve

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    Default Re: Alpha cd35c intermittant hot water (pulsing)

    is there anyway of descaling it with the heat exchanger in situ ??
    also do you know if the aqua-dial scale inhibiter filters are worth the money as i live in a hard water area ?
    Last edited by GRUNT16V; 25-01-2011 at 10:30 PM.

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    Default Re: Alpha cd35c intermittant hot water (pulsing)

    Its best to remove the H E and bench de-scale it! Manufactures dont normally recommend de scaler units.

    Where abouts do you live?
    Need an Alpha boiler repair or a service? If you're in Kent then give Alpha man a call to arrange a visit. Telephone 01233 712994, Steve, of Greenside Heating Services, GSR number 296.
    Sorry, no free technical advise given to the public either over the Internet or telephone.
    I will only visit if you're in KENT

    (I'm not Alpha nor work for them, just an Independant engineer.)

    Steve

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    Default Re: Alpha cd35c intermittant hot water (pulsing)

    somerset

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    Default Re: Alpha cd35c intermittant hot water (pulsing)

    Too far for me, Alpha will be your best bet sadly!
    Need an Alpha boiler repair or a service? If you're in Kent then give Alpha man a call to arrange a visit. Telephone 01233 712994, Steve, of Greenside Heating Services, GSR number 296.
    Sorry, no free technical advise given to the public either over the Internet or telephone.
    I will only visit if you're in KENT

    (I'm not Alpha nor work for them, just an Independant engineer.)

    Steve

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    Default Re: Alpha cd35c intermittant hot water (pulsing)

    do you know if aquadial filters are any good??

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    Default Re: Alpha cd35c intermittant hot water (pulsing)

    They never used to be! Google it?
    Need an Alpha boiler repair or a service? If you're in Kent then give Alpha man a call to arrange a visit. Telephone 01233 712994, Steve, of Greenside Heating Services, GSR number 296.
    Sorry, no free technical advise given to the public either over the Internet or telephone.
    I will only visit if you're in KENT

    (I'm not Alpha nor work for them, just an Independant engineer.)

    Steve

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    Default Re: Alpha cd35c intermittant hot water (pulsing)

    Quote Originally Posted by Alpha man View Post
    They never used to be! Google it?
    I have to no avail ! what pre boiler filtration do alpha recommend ?sorry to go on !

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    Default Re: Alpha cd35c intermittant hot water (pulsing)

    They dont for mains water, if its heating water then its a Fernox TF1 on the return pipe to the boiler.
    Need an Alpha boiler repair or a service? If you're in Kent then give Alpha man a call to arrange a visit. Telephone 01233 712994, Steve, of Greenside Heating Services, GSR number 296.
    Sorry, no free technical advise given to the public either over the Internet or telephone.
    I will only visit if you're in KENT

    (I'm not Alpha nor work for them, just an Independant engineer.)

    Steve

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