hello,
My first post im a registered engineer, not used forms before so hoping I've posted this right?
I have attended a no heat or water on my neighbours bias compact he combi,
Fan would not opperate, they were no power at the fan and fuses good so I determined that is was a pcb fault.
Replaced pcb- fan now operates but.
Only fires for hw not for heat when called for,
Also the actuator on diverter valve does not opperate.
So I now believe that the air pressure switch maybe faulty as well as the diverter actuator.
Could it be that these parts could have been damaged from a power surge when the pcb packed in?
My first post im a registered engineer, not used forms before so hoping I've posted this right?
I have attended a no heat or water on my neighbours bias compact he combi,
Fan would not opperate, they were no power at the fan and fuses good so I determined that is was a pcb fault.
Replaced pcb- fan now operates but.
Only fires for hw not for heat when called for,
Also the actuator on diverter valve does not opperate.
So I now believe that the air pressure switch maybe faulty as well as the diverter actuator.
Could it be that these parts could have been damaged from a power surge when the pcb packed in?