Can anyone shed any light. Gone to a customer boiler in lockout indicating ignition fault. Reset boiler pump comes on but fan doesn't then goes to lockout, so I suspect fan however tried again, this time just after pump comes on and before boiler goes to lockout I blow down the air pressure switch tube and find fan to come on boiler then runs fine and modulates perfectly until it switches off, then back to square one. The pressure switch is definetley OK and not sticking in open position before firing. Anyone got any ideas I think PCB personally but you know what its like returning them. Any help will be appreciated. Thanks brad

brad, January 2013

have u checked the voltage at the fan. is there voltage there or is it the fan. best thing i do is give worcester technical a call they are very helpful and can help u find out if its the pcb

kash, January 2013