Bn: Boiler level indicator (precisio):
1 = full
0= not yet full
Temperatures : of the boiler B3
(Precisio), the cavity B1, the 3 elements
of the core probe E2, E2b, E2c
Door detection:
0 = door open
1 = door closed
Gas safety status:
0 = functioning normally
1 = safety activated,
Condenser klixon state:
0 : open circuit, klixon cold
1 : short circuit, klixon hot