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Boiler didn't light up by the timer, went straight to lock-out and didn't come on manually. Corgi engineer contacted WB and he re-set the gas sense electrode and checked that it worked manually but he didn't check with the timer or room stat. After manual re-set it stays on for anything from...

My Worcester Bosch 14/19CBi boiler fires up but won't stay alight, goes through the usual sequence of attempting to fire up and then stops with the lockout light flashing. It will only stay alight if the combustion chamber cover is removed and then replaced after lighting. Any ideas!

Our boiler switches itself on by the timer, ignites approximately 10 seconds later, then immediately goes out, it will do this several times in the same cycle before switching itself off. I then have to turn the boiler on manually to try to ignite it but most of the time it repeats the same...