if i remember right no aps has a perm pilot so fan runs constantly at low speed, when under demand 240v to fan to run full speed. fans often go wrong as they work 24/7
yes,your right my friend..the board is scorched aswell, if fan running at low speed all time, when you call for heat does pump kick in and boiler ramp up to full speed ,there not cheap either,trying to talk punter into new boiler,he,s got a thing for vokera.s