1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Worcester heatslave 15/19 issues

Discussion in 'Plumbing and Central Heating' started by Cricket, 3 Apr 2021.

  1. Cricket

    Cricket

    Joined:
    3 Apr 2021
    Messages:
    19
    Thanks Received:
    0
    Country:
    United Kingdom
    I've got a Worcester heatslave 15/19 oil fired boiler that currently won't get past start up.
    The boiler is 18 years old and has danfoss white square control box, bentone burner, danfoss oil pump.

    The sequence is:

    From lockout press to reset.
    Fan starts
    Burner starts and runs for apx 10 seconds then locks out again.
    This is consistent.

    So far to try and isolate the problem I have checked oil flow & cleanliness of oil.
    Torch tested photocell
    Checked brightness of flame through cell hole.

    It's not going over temp or anything like that.

    I think it's either control box or photocell so am planning to replace the control box, back plate & cell with a matched danfoss set.

    Does this sound good?
     
  2. Sponsored Links
  3. martyndc88

    martyndc88

    Joined:
    26 Apr 2009
    Messages:
    1,014
    Thanks Received:
    252
    Location:
    South Glamorgan
    Country:
    United Kingdom
    Sounds like a good start. I'd hold off with the control box though fit that after the photocell.

    What happens when you shine a torch in the photocell
     
    • Thanks Thanks x 1
  4. Cricket

    Cricket

    Joined:
    3 Apr 2021
    Messages:
    19
    Thanks Received:
    0
    Country:
    United Kingdom
    No difference with torch, still only start cycle then lockout.
     
  5. martyndc88

    martyndc88

    Joined:
    26 Apr 2009
    Messages:
    1,014
    Thanks Received:
    252
    Location:
    South Glamorgan
    Country:
    United Kingdom
    Photocell should cure it
     
    • Thanks Thanks x 1
  6. Terrywookfit

    Terrywookfit

    Joined:
    19 Jul 2007
    Messages:
    5,742
    Thanks Received:
    1,086
    Country:
    United Kingdom
    Did you keep pc in the dark until it ignited.
     
    • Thanks Thanks x 1
  7. Cricket

    Cricket

    Joined:
    3 Apr 2021
    Messages:
    19
    Thanks Received:
    0
    Country:
    United Kingdom
    Not dark just dim. But this test was prior to observing the quality of the flame through the cell hole.

    So during start sequence, with cell in place, there is a nice bright yellow and steady flame for the cell to see.

    I also cleaned the lens with damp kitchen roll.
     
  8. Terrywookfit

    Terrywookfit

    Joined:
    19 Jul 2007
    Messages:
    5,742
    Thanks Received:
    1,086
    Country:
    United Kingdom
    If the cell sees light during the pre purge (Before solenoid oil release) it will lock out after ignition.
    With torch test grip FZ in your fist until solenoid opens and shine torch onto it after ign.
     
    • Thanks Thanks x 1
  9. Cricket

    Cricket

    Joined:
    3 Apr 2021
    Messages:
    19
    Thanks Received:
    0
    Country:
    United Kingdom
    Yes realised that afterwards. But since then decided that if the cell or control box was ok it would run after sequence because flame is good and bright (once reassembled)
     
  10. Sponsored Links
  11. Terrywookfit

    Terrywookfit

    Joined:
    19 Jul 2007
    Messages:
    5,742
    Thanks Received:
    1,086
    Country:
    United Kingdom
    IF THE CELL SEES LIGHT DURING PRE PURGE, IT WILL LOCK OUT, REGARDLESS OF THE FLAME QUALITY.
     
    • Thanks Thanks x 1
  12. Terrywookfit

    Terrywookfit

    Joined:
    19 Jul 2007
    Messages:
    5,742
    Thanks Received:
    1,086
    Country:
    United Kingdom
    Have you measured its resistance in light and dark ?
     
    • Thanks Thanks x 1
  13. Cricket

    Cricket

    Joined:
    3 Apr 2021
    Messages:
    19
    Thanks Received:
    0
    Country:
    United Kingdom
    I meant at next start sequence once cell reassembled in burner (y)
     
  14. Cricket

    Cricket

    Joined:
    3 Apr 2021
    Messages:
    19
    Thanks Received:
    0
    Country:
    United Kingdom
    No, I've found no reference for likely readings through the cell.
     
  15. Terrywookfit

    Terrywookfit

    Joined:
    19 Jul 2007
    Messages:
    5,742
    Thanks Received:
    1,086
    Country:
    United Kingdom
    10 MΩ in Dark
    10 KΩ in Light
    Not exact but very high and very low!

    If you feel adventurous ........About 60ua current flow.
     
    • Thanks Thanks x 1
  16. Cricket

    Cricket

    Joined:
    3 Apr 2021
    Messages:
    19
    Thanks Received:
    0
    Country:
    United Kingdom
    Worth a go, thanks.
    Can't get a replacement before Tuesday regardless.
     
  17. oilhead

    oilhead

    Joined:
    29 Nov 2009
    Messages:
    2,106
    Thanks Received:
    509
    Location:
    Shropshire
    Country:
    United Kingdom
    If the cell sees light during prepurge, surely it won't light as the solenoid is not opened. What is the number on the White square Danfoss control box? Is it a BHO11 or 12 , 57H1, or a BHO61?
    I can't recall ever seeing anything other than Satronic boxes on Heatslaves, and if someone has substituted along the way, this may be a mismatched cell and box.
     
    • Thanks Thanks x 1
Loading...

Share This Page