Does anyone know what fault H5 means on an Isar HE30 boiler?

the pcb has to be configured for that particular model of boiler by placing jumper link pins in a particular sequence

if you look at the old pcb
look at the top right hand corner
there should be a couple of black plastic tangs linking a series of pins

all you have to do is transfer the old pins to the exact same position on the new pcb & hey presto your boiler will work

manwithnoname
May 2011