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Discuss Alpha cd35c intermittant hot water (pulsing) in the Plumbing Forum area at UKPlumbersForums.co.uk.

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  1. GRUNT16V

    GRUNT16V Guest

    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
     
  2. Alpha man

    Alpha man GSR

    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?
     
  3. GRUNT16V

    GRUNT16V Guest

    My money is on the DHW heat exchanger. ooooooooooo crap

    Is the boiler is under manufactures guarantee? i think so

    many thanks
     
  4. Alpha man

    Alpha man GSR

    Phone Alpha and find out if your still under guarantee!! may not cost you a penny??
     
  5. GRUNT16V

    GRUNT16V Guest

    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 a moderator: Jan 25, 2011
  6. Alpha man

    Alpha man GSR

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

    Where abouts do you live?
     
  7. GRUNT16V

    GRUNT16V Guest

    somerset
     
  8. Alpha man

    Alpha man GSR

    Too far for me, Alpha will be your best bet sadly!
     
  9. GRUNT16V

    GRUNT16V Guest

    do you know if aquadial filters are any good??
     
  10. Alpha man

    Alpha man GSR

    They never used to be! Google it?
     
  11. GRUNT16V

    GRUNT16V Guest

    I have to no avail ! what pre boiler filtration do alpha recommend ?sorry to go on !
     
  12. Alpha man

    Alpha man GSR

    They dont for mains water, if its heating water then its a Fernox TF1 on the return pipe to the boiler.
     
  13. GRUNT16V

    GRUNT16V Guest

    so you dont have to have a filter on the feed from the mains to the boiler, just a tf1 on the ch circuit is this right ??
     
  14. Alpha man

    Alpha man GSR

    Yep, unless you think you need one, or phone the manufacture and ask them what they think, at least you will know either way then.
     
  15. GRUNT16V

    GRUNT16V Guest

    will do !
    in your oppinion what would you fit on the mains water feed if you were in a hard water area
     
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