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Hi guys, Sorry for the long wait .... but I think my engineer has at last got to the bottom of the 11 month problem. The fault seemed to be a short to earth in the wiring loom where it passes through a section of the casing which is double paneled and cannot be examined. The plastic insulation...

Hi Guys, Right...... the boiler is now going, and without the 'lock out light' but for some reason will only run when the 'service switch' is set to 'service'. A lot of head scratching here so the engineer suspects a faulty wire in the loom between the control panel and the service switch. He...

Hi guys, At last some developments - on Friday it blew the fuse again and did'nt come back to life when it was replaced(just at the start of the week end !!!) My heating engineer has just pulled it apart and found the capacitor on the motor with a sticky orange liquid leaking. Could this be...

Thanks for all your help guys - I'm afraid I'm no further ahead. There seems to be a pattern though, it pops the fuse usually about 2 to 3 mins after a cold startup. When the fuse is replaced the lockout light is "full" bright then gradually fades to a faint glimmer. If I'm lucky the boiler then...

Thanks a lot guys .... very helpful, the pump does nt seem to be the culprit as the heating engineer had it stopping/starting with no probs. Loose neutral ? could be ? More investigation required, I'll have to get the circuit diag. out again. (I hope it's not the pump, it's under the floor !!)...

I meant to mention that the lockout lamp can fade/flicker and brighten from time to time but never really goes out.

Thanks for that ..... control box was replaced last time (18 months ago) and my engineer has again replaced it last week ... problem continues. Its blowing a 5 amp fuse ? should it be a 3 amp?

Hi , I have a Worcester danesmoor 12/19 oil boiler which ran faultlessly for about 8 years then started to "lock out" intermittently. This was eventually traced to a faulty ht lead but only after most of the boiler innards were replaced. I has run now for a further 18 months but has started...