easiest way to identify the most common fault i've come across on these boilers is; to take off the combustion chamber cover then try to fire the boiler up, if the fan runs for about 2 seconds then stops and the fault light flashes then it'll be the pcb thats at fault. there are 2 pcb's for this boiler so give worcester a call to make sure you get the right one, it depends which gas valve it has fitted which determines the pcb. also, make sure you re-fit the code plug to the new board.
Ian
October 2009
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