Technical data

Code Reason

10 no flame detected

14 check the wiring harness

15 false flame

20 high limit thermostat/fume thermostat

21 check the wiring harness

22 check the wiring harness

24 high limit flow temperature probe

26 high limit return temperature probe

28 flow/return ΔT error

29 check the wiring harness

34 fan error (start-up)

37 fan error (high rpm)

40 low water pressure

42 pressure transducer fault

50-59 internal PCB failure

70 flow NTC error (2

CH)

72 return NTC error (2

CH)

79 flow/return ΔT error (2

CH)

80-83 internal fault

91 condensing heat exchanger cleaning requirement

Code Reason

11 false flame

12 restart ignition

13 check the wiring harness

23 check the wiring harness

25 high limit flow temperature probe

27 high limit return temperature probe

41 low water pressure

60 DHW NTC error

71 flow NTC error (2

CH)

77 over heat underfloor thermostat (2

CH)

78 flow/return ΔT error (2

CH)

Alarm 91 - Contact the Technical Assistance

The boiler has a self-diagnosis system which, on the basis of the

hours totalised in particular operating conditions, signals the need

for maintenance or cleaning of the primary exchanger (alarm code

91).