Hi guys bosch 24i junior,model before greenstar,turned on call for heat or hot water fan will not fire up,blow down tube on air pressure switch ,fires up straight away,am i right in thinking that on this model the air pressure switch must be in closed position at rest to start ignition sequence,thanks rob
[quote="htg engineer"]Fan running ? operating the air pressure switch makes the boiler come on - this is what the fan should do.
If the fan isn't running is there power to the fan ? if yes - replace fan.
htg[/quote] hi htg no fan does not run,when boiler turned on there is no power to the fan and eventually goes to fault flashing 4 times a second,if i reset it and blow into aps fan starts straight away,there is no power to the fan when boiler first turned on and when i manually start it by blowing aps there is only 180 volts ac to it has the pcb had it?