Alpha CB24 not starting up - strange problem

Discussion in 'Plumbers' Talk' started by rshiwnath, Apr 26, 2018.

  1. rshiwnath

    rshiwnath New Member

    Problem first began with A & B flashing together when demand from either hw or ch.

    Boiler guy changed out the pub then air pressure switch, then the fan plus new seals. Still no joy. Pump and fan run fine but APS is not being activated. He can short the APS and the boiler will fire up and run.

    Flue appears to be clear, it's a short length out the wall. Venturi was confirmed to be unblocked. Strange things is there appears to be a slight suction on the venturi, however the APS needs a. Blow to activate.

    Any ideas please? We're both flumuxed with it.
    20180426_202647.jpg 20180426_204619.jpg
     
  2. kiaora

    kiaora Guest

    Swop the tubes over!

    Maybe on wrong way

    Regards
    Peter
     
  3. rshiwnath

    rshiwnath New Member

    hmm, there's just the single tube from the venturi to the APS. On the APS its attached to the port furthest from the electrical connections.
     
  4. kiaora

    kiaora Guest

    Swop to the other port,
    There is normally a suck and blow connections
     
  5. rshiwnath

    rshiwnath New Member

    sorry for the slow reply Kiaora.. I'll give that a try. Thanks for the advice
     

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