it would if it worked
but it doesnt so either you havent fully diagnosed fault correctly and that on some occasion both board need to be changed as they dont match up or the board is f##ked
And for christs sake dont be using the neighbours ,if you can afford to get one boiler fixed you sure as hell cant afford to fix 2
If it isn't the board, what else could it be?
I was going to test my board in his boiler.