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Help.. Intermittent oil boiler lock out ( moved from Central heating Thread)

Discuss Help.. Intermittent oil boiler lock out ( moved from Central heating Thread) at UK Plumbers Forums; Help .. Running out of options.. I have a client with a Grant vortex utility system 36-46 with riello burner. There is about a 20metre 10mm oil line under ground ...
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    Question Help.. Intermittent oil boiler lock out ( moved from Central heating Thread)

    Help .. Running out of options..
    I have a client with a Grant vortex utility system 36-46 with riello burner.
    There is about a 20metre 10mm oil line under ground from tank to a fire valve (vertical? ) then tigerloop, Then in through a 22mm duct into the property under passage about 2.5mts then into boiler room out behind an unvented cylinder round into back of boiler. 2 Pipe then back to tiger loop.
    Flue is balanced flue straight up +/- 2mtrs through ceiling-roof
    It started locking out every few days last autum. I services it and changed dirty bowl filter.
    Went for a few days then locked out. I had a look and changed a stiff boiler temp control button and was fine all summer.
    Then a few weeks ago started locking out again. They always reset it by the time i got there and it seemed to run like a dream while I was there. Checked combustion, fan movement, oil supply etc. about 2 weeks ago went out locked out and smell of oil - cracked top of tigerloop?
    I then changed the tigerloop, flushed oil line ( few bits of sludge). Changed pump, drive dog and capacitor. Checked photo cell..
    All ran fine for a week then this morning locked out again. Going back tomorrow to have another look.
    I had a suspicion about the fire valve being vertical and no filter just before it. Problem is there is no room to install a filter where it comes out ground and to make fire valve horizontal.
    What is the affects of a vertically installed fire valve.
    Any Suggestions where to check next.?
    Is it only a fault in the burner that can cause a burner lock out?
    If there was a thermostat fault could that cause lock out or just over heat stat...?
    or poor flow through system...?
    Any suggestion welcome

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    Default Re: Help.. Intermittent oil boiler lock out ( moved from Central heating Thread)

    Heldite all the oil line joints.
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    Default Re: Help.. Intermittent oil boiler lock out ( moved from Central heating Thread)

    Don't waste your time and materials just changing parts.
    If a burner locks out, then the fault is to do with the burner, or its oil supply or fuel/air setting.
    A firevalve fitted vertical is totally fine.
    The oil pipe diameter needs to be not too big for Tigerloop and with no high spots and definitely no leaks. The suction hose could allow air in if jointed bad.
    Get an oil engineer to look at it. Too high an air setting will make boiler not start on cold weather first starts.
    Last edited by Best; 07-12-2016 at 12:25 AM.
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    Default Re: Help.. Intermittent oil boiler lock out ( moved from Central heating Thread)

    Quote Originally Posted by SimonG View Post
    Heldite all the oil line joints.
    Wonderful stuff, heldite. ....
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    Default Re: Help.. Intermittent oil boiler lock out ( moved from Central heating Thread)

    Quote Originally Posted by Best View Post
    Don't waste your time and materials just changing parts.
    If a burner locks out, then the fault is to do with the burner, or its oil supply or fuel/air setting.
    A firevalve fitted vertical is totally fine.
    The oil pipe diameter needs to be not too big for Tigerloop and with no high spots and definitely no leaks. The suction hose could allow air in if jointed bad.
    Get an oil engineer to look at it. Too high an air setting will make boiler not start on cold weather first starts.
    What do you mean oil pipe diameter needs to be too big for tigerloop?
    Unfortunately most of the oil line form tank to tigerloop is under concrete

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    Default Re: Help.. Intermittent oil boiler lock out ( moved from Central heating Thread)

    Burner settings are O2 - 5.6%, Co2 - 11.3% , Co ppm - 27 , Xair - 36.6%

    So should I suspect air getting in suction hose or pipework form tigerloop. Presume any air being sucked in on oil line from tank will be vented through tiger loop?

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    Default Re: Help.. Intermittent oil boiler lock out ( moved from Central heating Thread)

    capacotor......
    Best likes this.

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    Default Re: Help.. Intermittent oil boiler lock out ( moved from Central heating Thread)

    Quote Originally Posted by RayPlumb View Post
    What do you mean oil pipe diameter needs to be too big for tigerloop?
    Unfortunately most of the oil line form tank to tigerloop is under concrete
    No, my wording was diameter needs to be NOT too big.
    Your analyser readings are good, so it could be air getting into oil line, or very possibly the capacitor as Chalked mentioned. Check the burner motor/fan starts instantly and try the burner on and off a dozen times to test motor always starts instantly. Any split second start will show capacitor faulty.

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    Default Re: Help.. Intermittent oil boiler lock out ( moved from Central heating Thread)

    Quote Originally Posted by Best View Post
    No, my wording was diameter needs to be NOT too big.
    Your analyser readings are good, so it could be air getting into oil line, or very possibly the capacitor as Chalked mentioned. Check the burner motor/fan starts instantly and try the burner on and off a dozen times to test motor always starts instantly. Any split second start will show capacitor faulty.
    Thanks

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    Default Re: Help.. Intermittent oil boiler lock out ( moved from Central heating Thread)

    If capacitor is OK then solenoid could be on it's way out. OK when cold but degrading when warmed up and cutting off oil feed.

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    Default Re: Help.. Intermittent oil boiler lock out ( moved from Central heating Thread)

    Quote Originally Posted by mache View Post
    If capacitor is OK then solenoid could be on it's way out. OK when cold but degrading when warmed up and cutting off oil feed.
    I changed solenoid with one I knew worked. Day later locked out. Tested both and got 100 and 101ohms.

    Trying to work out if suction pipe sizing is correct.. I have 20- 25mts of 10mm copper pipe from oil tank to tigerloop. If pipework was forming gas and air in the pipe run would it not vent at the tigerloop ?

    The boiler nozzle capacity is 4.5kg/h
    Boiler is set at 41kw
    Last edited by RayPlumb; 07-12-2016 at 10:33 AM. Reason: correced

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    Default Re: Help.. Intermittent oil boiler lock out ( moved from Central heating Thread)

    Bottom of tank and tigerloop same height and burner down about 0.5mts

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