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  • FIRST POST
    jason
    Biasi 24s combi boiler not working
    • #1
    • 22nd Aug 05, 8:53 PM
    Biasi 24s combi boiler not working 22nd Aug 05 at 8:53 PM
    Please can someone advise me about my boiler, when I turn the boiler on for heating or hot water it fires up but after a few seconds goes to lockout. I have taken the cover off so I can see the fan and burner, fired boiler up and boiler stayed on but when I put the cover back on the flame goes off and boiler goes to lockout. A friend said it could be the air pressure switch. Can anybody help please. :confused:
Page 1
    • miniemma
    • By miniemma 22nd Aug 05, 8:56 PM
    • 383 Posts
    • 182 Thanks
    miniemma
    • #2
    • 22nd Aug 05, 8:56 PM
    • #2
    • 22nd Aug 05, 8:56 PM
    I'm certainly no expert but, do the radiators need bleeding?
  • jason
    • #3
    • 22nd Aug 05, 9:01 PM
    • #3
    • 22nd Aug 05, 9:01 PM
    No the pressure is 1:5 bar which is fine.
    • flea72
    • By flea72 22nd Aug 05, 9:04 PM
    • 5,141 Posts
    • 5,143 Thanks
    flea72
    • #4
    • 22nd Aug 05, 9:04 PM
    • #4
    • 22nd Aug 05, 9:04 PM
    do you have thermostatic valves on all your rads?

    i have this prob with my biasi boiler, and the only thing that has cured it, is to have one rad valve, fully open all the time
  • jason
    • #5
    • 22nd Aug 05, 9:04 PM
    • #5
    • 22nd Aug 05, 9:04 PM
    No pressure is at 1:5 bar which is fine.
  • jason
    • #6
    • 22nd Aug 05, 9:06 PM
    • #6
    • 22nd Aug 05, 9:06 PM
    Yes there are TRVs but all the valves are open
  • jason
    • #7
    • 22nd Aug 05, 9:13 PM
    • #7
    • 22nd Aug 05, 9:13 PM
    Did you take the cover off your boiler so you could see inside and did the boiler then stay on.
    • flea72
    • By flea72 22nd Aug 05, 9:37 PM
    • 5,141 Posts
    • 5,143 Thanks
    flea72
    • #8
    • 22nd Aug 05, 9:37 PM
    • #8
    • 22nd Aug 05, 9:37 PM
    are all the valves fully open?

    i dont know about removing the cover and it staying on or not. as im not technically minded, i paid for an engineer to come out - he advised having one of the valves fully open, the others i could have at whatever temp i wanted, something about you shouldnt have thermostatic valves on all rads, as it means the system doesnt have a bypass (?)

    could be complete twaddle, but it seems to have worked, and ive had no probs since

    flea
    • robowen
    • By robowen 22nd Aug 05, 10:46 PM
    • 2,962 Posts
    • 1,719 Thanks
    robowen
    • #9
    • 22nd Aug 05, 10:46 PM
    • #9
    • 22nd Aug 05, 10:46 PM
    are all the valves fully open?

    i dont know about removing the cover and it staying on or not. as im not technically minded, i paid for an engineer to come out - he advised having one of the valves fully open, the others i could have at whatever temp i wanted, something about you shouldnt have thermostatic valves on all rads, as it means the system doesnt have a bypass (?)

    could be complete twaddle, but it seems to have worked, and ive had no probs since

    flea
    by flea72
    All boilers should have a bypass. A lot of new boilers have inbuilt bypasses.
    Older boilers required a connection from the flow pipe to the return pipe, before the first radiator. This would have a gate valve on it which would be mostly closed off to allow some water to return to the boiler.

    It's common to have the bathroon rad valves completely open and this would act as the bypass too. This is why TRV's are not fitted in bathrooms unless a bypass is identified.

    rob
    If only everything in life was as reliable...AS ME !!
    robowen 5/6/2005

    ''Never take an idiot anywhere with you. You'll always find one when you get there.''
    • robowen
    • By robowen 23rd Aug 05, 12:22 AM
    • 2,962 Posts
    • 1,719 Thanks
    robowen
    Please can someone advise me about my boiler, when I turn the boiler on for heating or hot water it fires up but after a few seconds goes to lockout. I have taken the cover off so I can see the fan and burner, fired boiler up and boiler stayed on but when I put the cover back on the flame goes off and boiler goes to lockout. A friend said it could be the air pressure switch. Can anybody help please. :confused:
    by jason
    It won't be the air pressure switch.
    If it were, then the boiler would not fire up to start with.

    When you switch your boiler on, the first thing that happens is the fan starts. If the fan doesn't go.....it won't change the contacts over on the APSwitch and won't fire the boiler.
    If the fan goes and the boiler doesn't fire up, it could be the APSwitch.
    If the fan goes and the boiler fires up, the APswitch is ok.

    I've been to a few where the customer had tried to top up the boiler and had closed off the flow isolation valve. This caused the boiler to lock out after a few seconds.
    as you mentioned, there seems to be no bypass with your system, and this could cause the high limit stat to kick in and shut the boiler down.
    This will happen when all the rad valves closed at the same time.

    I think your boiler man was right.

    rob
    If only everything in life was as reliable...AS ME !!
    robowen 5/6/2005

    ''Never take an idiot anywhere with you. You'll always find one when you get there.''
  • marc_bell
    I have used my boiler over night for central heating then I turned it off in the morning I wanted to turn it back on in the afternoon but it won't light up no hot water either. can anyone help ?
    • dan23uk
    • By dan23uk 22nd Oct 10, 8:17 PM
    • 93 Posts
    • 66 Thanks
    dan23uk
    Please can someone advise me about my boiler, when I turn the boiler on for heating or hot water it fires up but after a few seconds goes to lockout. I have taken the cover off so I can see the fan and burner, fired boiler up and boiler stayed on but when I put the cover back on the flame goes off and boiler goes to lockout. A friend said it could be the air pressure switch. Can anybody help please. :confused:
    Originally posted by jason
    The Venturi in the fan/flue turret needs cleaning

    Dan
  • 1984ReturnsForReal
    The Venturi in the fan/flue turret needs cleaning

    Dan
    Originally posted by dan23uk


    If he still lives there 5 years on.....
    • dan23uk
    • By dan23uk 22nd Oct 10, 8:47 PM
    • 93 Posts
    • 66 Thanks
    dan23uk
    Ha! It's been a long week!
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