MY BOILER IS A HALSTEAD FINEST COMBI AND IT SEEMS TO TAKE AN ETERNITY TO GET HOT WATER. I HAVE TAKEN THE MICROSWITCH ASSEMBLY OFF AND OPERATED THIS MANUALLY AND THIS MAKES THE BOILER FIRE UP STRAIGHT AWAY. THE PROBLEM SEEMS TO LIE WITHIN THE ASSEMBLY WHERE THE LITTLE FLOW OPERATED PLUNGER COMES OUT TO SWITCH THE MICROSWITCH AS THIS PLUNGER TAKES A VERY LONG TIME TO START MOVING. ANY IDEAS WOULD BE MOST WELCOME, CHEERS!