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disconnect mains on pcb then turn 3amp fuse back on that way your pooring its the boiler,also check for a slight melting around the 10 way morlex thats where pump,fan come back in.very good chance its the pcb.

hi sorry what i ment to say was fan runs i can then hear a spark for about 1 secound, then red lock light comes on many thanks

can anybody help i have a boxer combi boiler fitted(when i bought house) the boiler runs doesn't fire then red lock out light comes on,i've had 5 guys look at it & spent a few quid on parts with no look at all. i stoped warmsure engineer & asked for advised said to replace pcb,still no good...