my son who is in hospital has a ferroli HE 31 C Optimax
boiler at his home, when I tried to run the heating I messed it up. I am not sure what position the black and blue switches should in. Are they in straight line following direction of piping or Xways. Please help.

bob, January 2011

the blue taps in line the black taps at right angles if you want to increase the pressure turn black taps in line then back when you've finished

brian, January 2011