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Discuss Problem getting burner to keep firing in the Oil and Solid Fuel Forum area at UKPlumbersForums.co.uk.

  1. Robert Tyrrell

    Robert Tyrrell GSR

    ok - I'm on holiday at the moment and I can't get to the boiler to try anything at the moment but this is bugging me so I'd like your opinions on probable causes/remedies.
    Just a few hours before I left for my holiday I got called to a breakdown of a Worcester heatslave because it had started to play up with the burner firing, staying on for 9 seconds, and then going to lockout.
    I've done all my diagnostics. Changed the nozzle, pump, photocell, and oil line but I still couldn't get it to work for longer than 9 seconds.
    Customer said it started to play up about 2 weeks ago and has steadily got worse.
    They aren't too worried about it not working at the moment but I'll be going back as soon as I return from my holiday so any advice would be gratefully received :)
     
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Heating pump not pumping?
     
  3. Robert Tyrrell

    Robert Tyrrell GSR

    Ahhh - now there's a thought. Just goes to show what goes out of the window when you're trying to get packed in time to catch a flight eh?
    Thanks.
    That'll be my first check when I get back to it :)
     
  4. mache

    mache Active Member

    Solenoid on its last legs. ???
     
    • Like Like x 1
  5. quality

    quality Plumber GSR

    Ive had that before
     
  6. Chalked

    Chalked Plumber GSR

    What pressure were you getting at the pump?
     
    • Like Like x 1
  7. Robert Tyrrell

    Robert Tyrrell GSR

    Forgot to add that to the list but it was a new danfoss pump, and solenoid. The pressure I set was from the MI
     
  8. SimonG

    SimonG Trusted Plumber

    Control box.
     
    • Agree Agree x 2
  9. Gazzt

    Gazzt Active Member

    What about the capacitor, it should be 3uf or 4uf, if you have a multi multimeter you can test capacitor.
    Also if it was a danfoss L 21 or R21 you have to remove the bypass screw as they now come setup for 2 pipe rather than 1 pipe. Just something to check.
     
  10. SimonG

    SimonG Trusted Plumber

    Burner wouldnt fire if it was capacitor. Just buzz.
     
  11. Best

    Best Trusted Plumber Top Contributor!!

    Since he ruled out the solenoid and cell, then has to be control box doing a steady second fail.
    But you can get new solenoids failing.
    I would have swapped the box for a new one to test it instantly.
     
  12. Robert Tyrrell

    Robert Tyrrell GSR

    I have swapped out the control box with a new one but it was an older model.
    The pump is an 11L3, if memory serves me right. Do they come set up for two pipe now as well?
     
  13. Best

    Best Trusted Plumber Top Contributor!!

    I am not sure, but as it is a wee washer in the 11L3 for one pipe, I would assume it will remain done that way and washer only needs removed for any that are 2 pipe
     
  14. Gazzt

    Gazzt Active Member

    I think the danfoss 21r and 21l are set for two pipe, bfp11 come 1 pipe, but check documentation.
    After changing all the parts are you still getting lock out.
     
  15. Gazzt

    Gazzt Active Member

    I know this might sound daft but is there enough oil in the tank, and if you use a vacuum gauge on the pump it will let you know if you have a blockage, i has seen remote fire valves block with sludge and also they can fail and stick in the closed position.
     
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