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bosch worcester 14/19cbi lockout - fires up for 1 second?

my bosch worcester 14/19cbi has lockout light flashing - when i reset it fires up for 1 second and fan comes on then cuts out - this happens about 4 times and then the lockout light flashes again.
G. D. C., April 2012
worcester 14/19 CBi
GCN 41-311-52
ignition problem
fails to detect burner alight
ignition/detection electrode faulty?
maybe shorting to earth via boiler casing?
would need to check condition of wiring between electrode & PCB to determine precise cause of fault

manwithnoname, April 2012
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