Ariston EURO COMBI A/23 MFFI Servicing Instructions - Page 25

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Ariston EURO COMBI A/23 MFFI Servicing Instructions
2.2
Fault Finding Using the
Total Check System
1
2
3
4
5
6
Pump fed
Main flow switch closed
Air pressure switch N.O.
Flame detected
Water at required temperature
Room thermostat/clock no demand or
selector in summer setting
Auto diagnostics faulty
D.H.W. exchanger efficiency control
Heating circuit efficiency control
Heating temperature control
D.H.W. temperature control
B029
Signalling
Boiler Off
Auto diagnostic state
Spark ignition state
Boiler functioning normally
Lockout
Boiler thermostat satisfied
Room thermostat/clock no demand or
selector in summer setting
Malfunction
A
Faulty ventilation system
b
Air pressure switch stuck in N.O. position
C
Faulty reset switch
d
Faulty main circuit flow switch
E
Faulty flame detection
F
Faulty overheat thermostat
G
Faulty exhaust fumes sensor
I
Faulty heating sensor (N.T.C.)
m
Faulty D.H.W. sensor (N.T.C.)
25