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Myson Velaire Vitesse blowing fuse

Discussion in 'Plumbing and Central Heating' started by Martin pawsey, 24 Jan 2021.

  1. Martin pawsey

    Martin pawsey

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    Hi all
    Have a Myson Velaire Vitesse which was installed new in 1992
    Been serviced on and off and besides a new pump 5 years ago has worked fine. this morning I noticed the power to it was dead as no lights on the control unit. Checked fuse and was blown. Put a new fuse in and it started the purge programme straight away but when it went to fire up it blew the fuse again. I had a new burner control unit that attaches to the burner so swapped them out, replaced fuse but same again. Runs purge then when goes to fire blows fuse.
    it’s minus 4 here and can’t get an engineer for ages so any ideas as to what the issue could be?
    Thanks in advance
    Martin
     
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  3. oilhead

    oilhead

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    Odds on the oil pump solenoid coil. Disconnect it and try starting the burner. It should purge, then go to lockout if the coil is the cause. I'm assuming you still have the original inter burner.
     
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  4. Martin pawsey

    Martin pawsey

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    Many thanks. The burner is original
    There is a crack on the solenoid and the nut just spins on the shaft
    C80100C4-4B20-4D79-8EF3-7F698320A773.jpeg
    CA6A9B0C-9C26-497C-8649-F265F480052E.jpeg 4EC9B03A-472C-4845-89A2-2F495ED67F63.jpeg 8724979D-F1D8-4AD6-B1E9-67CC86309940.jpeg
     
    Last edited: 24 Jan 2021
  5. BoilerBob

    BoilerBob

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    That’s the prob. Bob
     
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  6. Martin pawsey

    Martin pawsey

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    Fingers crossed. Oil line decided to split as well as I moved the burner out. Hopefully pick both up to orrow in town
     
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  8. oilhead

    oilhead

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    It's amazing how inflexible flexible hoses become when they lie undisturbed. Have you managed to loosen the nut on the solenoid or did the whole stem come out?
     
  9. Martin pawsey

    Martin pawsey

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    Hi Oilman
    Picked up a new flexible hose and solenoid coil in town plus had to get a new immersion heater as wondered why the old one wasn’t heating the water while the boiler was off. Took plastic cap off and all terminals fell apart and started leaking (I thought it’s going to be one of those jobs)
    Didn’t think the old immersion was going to unwind butluckily it went. New one fitted and working.
    Got old flexible hose off oil filter nice and easy and fitted to pump. Couldn’t get a direct replacement for the suntec one so took a chance on a Danfoss one which fitted Ok. put everything back together and it fired up fine except oil coming from the solenoid shaft. Stripped it down, old washer flat so luckily had a new one the same size. Put back fired up again and now lots of hot water and central heating...
    Thanks for your help
     
  10. oilhead

    oilhead

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    Just be aware, you really need to get it recommissioned as the pressure will not be set. If a new Danfoss pump, it will be set at 10 bar (150psi), which is probably 30 psi more than you want. Watch out for plumes of smoke.
     
  11. Martin pawsey

    Martin pawsey

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    I didn’t change the pump just the solenoid coil so pump as before
     
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