When your Ariston boiler develops a fault, an error code will appear on the display panel. Most error codes include three numbers, but some are a mixture of a letter and a couple of numbers. Some fault codes apply to all Ariston combi, system and regular boilers, whereas others are unique to a specific model or range. All Ariston boiler fault codes help make it easy for your heating engineer to diagnose problems and solve issues with your boiler.
You can find fault codes for your Ariston boiler in your user manual or by referring to the tables below.
Ariston Clas Net One Combi, E-System One and Clas System One Boiler Fault Codes
CENTRAL HEATING CIRCUIT
DISPLAY
DESCRIPTION
101
Overheat
103
Insufficient circulation
104
Insufficient circulation
105
Insufficient circulation
106
Insufficient circulation
107
Insufficient circulation
108
Insufficient water (request filling)
109
System pressure > 3 bar
110
C.H. flow temp. probe circuit open / short circuit
112
C.H. return temp. probe circuit open / short circuit
114
External sensor circuit open / short circuit
116
Floor thermostat contact open
118
Heating delivery probe problem
1P1
Insufficient circulation indication
1P2
Insufficient circulation indication
1P3
Insufficient circulation indication
1P4
Insufficient circulation indication
D.H.W. CIRCUIT
205
DHW in probe open circuit (Solare temp. probe)
INERNAL P.C.B.’s
301
EEPROM error
302
Communication error
303
Main PCB error
304
Too many (>5) resets in 15 minutes
305
Main PCB error
306
Main PCB error
307
Main PCB error
3P9
Sched. Maintenance – Call Service
EXTERNAL P.C.B.’s
411
Room sensor circuit open or short circuit Zone 1
412
Room sensor circuit open or short circuit Zone 2
413
Room sensor circuit open or short circuit Zone 3
IGNITION AND DETECTION
501
No flame detected
502
Flame detected with gas valve closed
504
Flame lift
5P1
1st ignition failed
5P2
2nd ignition failed
5P3
Flame cut-off
AIR INLET / FLUE GAS OUTLET
610
Overheat (Main heat exchanger)
612
Insufficient fan speed
MULTI-ZONE HEATING (HEATING ZONE MODULES – OPTIONAL)
701
Zone 1 send sensor defective
702
Zone 2 send sensor defective
703
Zone 3 send sensor defective
711
Zone 1 return sensor defective
712
Zone 2 return sensor defective
713
Zone 3 return sensor defective
722
Zone 2 overheating
723
Zone 3 overheating
750
All heating zones locked
Ariston Clas HE Evo Combi Boiler Fault Codes
CENTRAL HEATING CIRCUIT
DISPLAY
DESCRIPTION
101
Overheat
102
Pressure sens error
103
Insufficient circulation
104
Insufficient circulation
105
Insufficient circulation
106
Insufficient circulation
107
Insufficient circulation
108
Insufficient water (request filling)
110
C.H. flow temp. probe circuit open / short circuit
112
C.H. return temp. probe circuit open / short circuit
114
External sensor circuit open / short circuit
116
Floor thermostat contact open
118
Heating delivery probe problem
1P1
Insufficient circulation indication
1P2
Insufficient circulation indication
1P3
Insufficient circulation indication
D.H.W. CIRCUIT
202
Bottom storage temperature probe open / short circuit
204
Solar collector temperature probe open / short circuit
207
Solar collector overheating
208
Collector frost protection temperature
INERNAL P.C.B.’s
301
EEPROM error
302
Communication error
303
Main PCB error
304
Too many (>5) resets in 15 minutes
305
Main PCB error
306
Main PCB error
307
Main PCB error
EXTERNAL P.C.B.’s
407
Room sensor circuit open / short circuit
IGNITION AND DETECTION
501
No flame detected
502
Flame detected with gas valve closed
504
Flame lift
5P1
1st ignition failed
5P2
2nd ignition failed
5P3
Flame cut-off
AIR INLET / FLUE GAS OUTLET
604
Insufficient fan speed
610
Thermofuse open
MULTI-ZONE HEATING (HEATING ZONE MODULES – OPTIONAL)
