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RDB boiler not starting (video)

Discussion in 'Plumbing and Central Heating' started by Jay79, 15 Jan 2021.

  1. Jay79

    Jay79

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    My oil heating is set on timer to come on every morning. I noticed 3 or 4 of mornings ago it didnt come on. I was able to press a reset button that was behind a cover that i screwed off on a small grey box (see picture) and the burner fired.

    Fast forward to yesterday morning and the burner seemed to come on for an hour before cutting out (which I didnt realise as I was sleeping, I since figured the hot water wasnt that hot, so the burner wasnt firing for long). Then, last night the burner didnt fire again. I pressed the red reset button on the burner and off it went, but again cut out after, lets say an hour.

    So I thought I would take a look this morning & here I am. This morning, the burner wont fire. It sound to me as though it is struggling to get power, like its runnning on half the power of mains electric is normally has if that makes sense. I made a quick video to see if any of you guys can help... Would be appreciated.

    (edit, i also think the red light on the reset button isnt as bright as what I thought it was)...


     

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  3. Jay79

    Jay79

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    update:

    unplugged & plugged in the boiler from the mains (leads in boiler housing), this seems to have given power again, loosened bleed vavle - oil is there and is pumping when boiler tries to start but it doesnt fire.

    I just checked the oil I am a bit low in the sense the oil lovel has dropped slightly below the top of the outlet but oil is still flowing to the boiler when i open the bleed screw.


     
  4. Terrywookfit

    Terrywookfit

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    Motor capacitor or seized oil pump. Or both |
    As you say your oil is low it may have sucked water in.
     
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  5. Jay79

    Jay79

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    Thank you Terry

    I am going to try a new capacitor & a few hundred litres of oil. The capacitor looks pretty simple to change, but these can be dangerous right? Does it need discharged? I'll disconnect the boiler from the mains & pull off the capacitor at the spade connectors?

    Lastly, can I buy this type of capacitor at a local electrical wholesaler or would it be plumbing supplies etc?

    thanks for the help, i appreciate it.

    capacitor1.JPG capacitor2.JPG
     
    Last edited: 15 Jan 2021
  6. oilhead

    oilhead

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    A heating merchant will have the correct part, but any capacitor with the same values will suffice, but you may have to adapt the mounting and connectors.
     
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  7. Jay79

    Jay79

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    Thank :) is it safe to just pull of off now at the connectors? I’ll take it with me to a local shop.
     
  8. Harry Bloomfield

    Harry Bloomfield

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    It isn't a standard electronic capacitor, it is a special mains voltage rated type, intended as a starter capacitor.
     
  9. Terrywookfit

    Terrywookfit

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    Just short the terminals before touching them. For peace of mind. TURNED OFF !!!
     
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  11. Terrywookfit

    Terrywookfit

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    WTF are you talking about.?? Some of the caps in electronics are rated at 1000v.
     
  12. Harry Bloomfield

    Harry Bloomfield

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    AC rated? I didn't want the OP being given just any old cap of the correct voltage and mf, these are specials.
     
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  13. Jay79

    Jay79

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    ok, thanks guys, tried to short the capacitor but no reaction. will try to source another one locally and report back. thanks again for the help.
     
  14. freeoil

    freeoil

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    oil pump about 80 quid with new drive.Best getting a boiler man to set it up and clean the oil filters including dipping for water content. £150 - £200 approximately.
     
  15. Jay79

    Jay79

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    no point trying a capacitor then?
     
  16. freeoil

    freeoil

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    Educated guess.In my area ill replace 20 oil pumps for every capacitor.Unfortunately service guys rarely clean oil filters in this neck of the woods which doesnt help.
     
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  17. Terrywookfit

    Terrywookfit

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    Take oil pump off and turn shaft by hand.
    If it is tight its prob fooked.
    With pump off turn burner on and see if motor runs..
     
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