Ferroli optimax he plus 31c

[jordand]

Fault with above boiler. Dhw works fine but when ch demand is made pump runs for 10 secs, 26 appears on display, fh shows on display (purge mode).
Disconnect pump and no 26 or fh is displayed which leads me to think pump is shorting or could this be a pcb fault?

 

[zeebeedee]

I'd be looking towards the board,stats or loose wire if the dhw is working.

 

[splinterdream]

Every time you switch the power off then on it will go into purge/test mode. To skip this turn power off, hold eco button and turn power on. Once display comes on let go of button.

 

[splinterdream]

look at the diverter, it's probably stuck, they're pants, have changed dozens of them.