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Worcester Bosch Greenstar Utiliy 18/25 lockout issues

Discussion in 'Plumbing and Central Heating' started by martyn s, 3 Jun 2018.

  1. martyn s

    martyn s

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    Hi we have a W.B. Greenstar utility 18/25 installed in 2012 that has been very unreliable over the past 2 1/2 years. The chap who serviced it last recons they have a design fault. anybody else heard this? or come across the same issues? the red lockout light comes on all the time. ta
     
  2. Hairymelon

    Hairymelon

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    These boilers have the burner mounted higher than normal , downfiring into the boiler shell. Most lockout problems (if not due to faulty burner parts) are caused by oil supply problems.
    If the oil tank is at ground level with a longish run the burner has to draw the oil further and beat gravity. If it has a riello rdb burner you should have a twin pipe set up
    with a tiger loop. Other burners with a danfoss oil pump will draw higher but can draw in air bubbles due to the suction which will cause lockouts. Get a decent oil man to take alook
     
  3. martyn s

    martyn s

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    thanks Karatekid, the tank sits approx 350mm above the level where the boiler sits. top outlet with a floating pickup. the run is approx 15M. we have a twin pipe system and a tiger loop with a Danfoss BFP11 L3 pump. cheers
     
  4. Terrywookfit

    Terrywookfit

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    You might get more response if you gave details of when lockout actually occurs.
     
  5. martyn s

    martyn s

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    the lockout light comes on when the boiler tries to start up from cold- sometimes flashing sometimes solid red. Im interested to know if anybody has experienced similar issues with this boiler thanks
     
  6. oilhead

    oilhead

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    Cold starting problems are usually down to poor combustion settings, although a leak in the oil supply can also cause this. Is there a permanent oil level in the tiger loop? When the boiler is running, are there any bubbles in the tiger loop?
     
  7. martyn s

    martyn s

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    the tiger loop is all metal so cant see the level or bubbles- the line was pressure tested 3 months ago and was fine then. thanks
     
  8. Terrywookfit

    Terrywookfit

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    A visit to a cold start with OPG connected would be good.
    What are combustion readings.
     
  9. snb

    snb

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    cold start problems are also caused by low reading on motor coil. what is the reading of the motor coil when you tested it?
     
  10. Terrywookfit

    Terrywookfit

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    I take it you are referring to the motor start capacitor .
     
  11. snb

    snb

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    Yep
     
  12. DIYnot Local

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