worcester 28 si ii

[desrob]

the boiler would from cold allow you to have a shower,then knock off with fault light flashing(fast)primary sensor is ok as are ch dhw,the boiler did however start to smell of burning so i knocked it off and i had to leave it as owner needed to go out i said i would go back later,i fear the smell might be pcb or the fan, but why did it play up when i was there,by the way after the burning smell the boiler would not go through the lighten sequence,any ideas ...how longs a piece of string....?