W
willys warmer
if it goes to lock out straight away prior to attempting ignition id say 88 degree stat. if boiler lights on hot water but goes out after a few seconds try removing ash tray at top of boiler if this stays on you will find its the fan.you can elliminate aps by trying heating first. if the heatings ok the fan is cause it is not getting the speed it requires for h/w. oh if youve replaced board try setting minimum maximum pressures on board /gas valve.