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  1. I

    Boiler Blues

    Changed main circuit board and thermostatic valve on main heat exchanger. All working well now.8) Fingers crossed! it will stay that way. Thanks for the feedback. Much appreciated :wink: :wink:
  2. I

    Boiler Blues

    Thanks for the feedback. :) Answers as follows: The gauge is the temperature gauge and not the pressure gauge The servo valve is working properly
  3. I

    Boiler Blues

    I have a Vaillant GB 221 H Combi-Boiler and have the following problem with my central heating. Although the pump works when heating is turned on, boiler refuses to ignite. :? If boiler does ignite :shock: it cuts off after a spell of time (generally between 3 minutes to 10 minutes)...
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