any help please. boiler seems to have gone on lockout but giving me hot water no heating. pump, divertor valve ok but noticed pump pin stuck out. overheat thermo wont reset. flame starts when on hot water but when i switch to ch dies fan stays on for 15 secs and stops and symbols show 90 for a few secs then dissapear. Have had engineer out but hasnt returned another due monday. Been without heating for 2 days you woulnt believe how many engineers ive phoned today but cant attend soon after all saying it souns like a divertor valve which i know it isnt as previous engineer had heating on for 10 mins after removing divertor motor. Any advice pls im thinking maybe electrial prob