worcester 15CBi lockout problems

[dickbarton]

Hi having problems with my Worcester 15 CBi boiler after replacing tthe circuit board and the gas valve ,which had become faulty, the boiler keeps locking out at least once a day ,especially after baths . Anyone any ideas what could be the cause or causes ? Cheers in advance

[WILLWONKER]

Could it be air from the meter too the g/ valve, or has the boiler got a learnig code for restarting

[terence7556]

are you getting any fault codes? what does your manual say and have you asked for an opinion from the rgi that changed the parts

[Hymie]

According to my information, there are two possible reasons for this boiler to lock-out.
Either the over heat thermostat operates or the flame fails to ignite.

If it is caused by the flame failing to ignite, I would expect whenever there is a demand for the boiler to fire up – that frequently it would take some time before the flame is successfully ignited (the control circuit allows the boiler 8 seconds to ignite the flame – before shutting down). Should the lock out occur due to an over heat, then this is likely to occur while the burner is on – but observing this could be difficult.

My bet would be on the flame failing to ignite due to either muck on the spark electrode – or incorrect positioning of the electrode, both of which would result in a poor spark.

[garrylee05]

hi turn off c/h and see if hot water gets hot only if so could need a power flush...

[garrylee05]

sorry didnt read full question,,,, electrodes