The Ariston range of powerful but small boilers are normally extremely reliable.
Occasionally some things can go wrong; that’s why we’ve created our handy at-a-glance table of Ariston error codes below.
Ariston Error Codes
Fault Code | Boiler Model | Possible Cause |
Central Heating Circuit | ||
101 | All Boilers | Overheat |
102 | E-Combi Evo E-System Evo Clas He Evo (Combi and system) | Pressure sensor error |
103 | All Boilers | Insufficient circulation |
104 | All Boilers | Insufficient circulation |
105 | All Boilers | Insufficient circulation |
106 | All Boilers | Insufficient circulation |
107 | All Boilers | Insufficient circulation |
108 | All Combi Boilers | Insufficient water (request filling) |
109 | Clas net one / Clas one Combi Clas system one | System pressure greater than 3 bar |
110 | All Boilers | Central heating Flow temperature probe circuit open / short circuit |
112 | All Boilers | Central heating return temperature probe circuit open / short circuit |
114 | All Boilers | External sensor circuit open / short circuit |
116 | All Combi and System Boilers | Floor thermostat contact open |
118 | All Boilers | Heating delivery probe problem |
1p1 | All Boilers | Insufficient circulation indication |
1p2 | All Boilers | Insufficient circulation indication |
1p3 | All Boilers | Insufficient circulation indication |
1p4 | Clas Net one Combi Clas one Combi Clas System one | Insufficient circulation indication |
D.H.W Circuit | ||
202 | Clas HE evo Clas he evo system E-combi evo E-system evo | 2 bottom storage temperature probe open/short circuit |
204 | Clas HE evo Clas he evo system E-combi evo E-system evo | Solar collector temperature probe open/short circuit |
205 | E-combi one E-System one Clas Net one Combi Clas one Combi | Domestic hot water in probe open circuit |
207 | Clas HE evo Clas he evo system E-combi evo E-system evo | Solar collector overheating |
208 | Clas HE evo Clas he evo system E-combi evo E-system evo | Collector frost protection temperature |
Internal printed circuit board (PCB) | ||
301 | All Boilers | EEPROM error |
302 | All Boilers | Communication error |
303 | All Boilers | Main printed circuit board (PCB) error |
304 | All Boilers | Too many resets (> 5) in 15 minutes |
305 | All Boilers | Main printed circuit board (PCB) error |
306 | All Boilers | Main printed circuit board (PCB) error |
307 | All Boilers | Main printed circuit board (PCB) error |
3P9 | E-combi one E-System one Clas Net one Combi Clas one Combi Clas System one | Schedule service |
External printed circuit board (PCB) | ||
407 | Clas HE evo Clas he evo system E-combi evo E-system evo | 7 Room sensor circuit open/short circuit |
Ignition and Detection | ||
501 | All Boilers | No flame detected |
502 | All Boilers | Flame detected with gas valve closed |
504 | All Boilers | Flame lift |
5P1 | All Boilers | 1st ignition failed |
5P2 | All boilers | 2nd ignition failed |
5P3 | All Boilers | Flame cut-of |
Air Inlet / Flue gas outlet | ||
604 | CLAS HE R E-Combi Evo E-System EVO Clas HE evo Combi Clas HE evo System | Insufficient fan speed |
610 | All Boilers | Thermofuse open |
612 | Clas HE Evo Combi Clas He Evo System E-Combi Evo E-system Evo Clas net one combi Clas one combi Clas system one | Fan speed has incorrect measurement |
Multi-zone Heating | ||
701 | E-Combi Evo E-System EVO Clas HE evo combi Clas he evo system | Zone 2 outgoing sensor defective |
702 | E-Combi Evo E-System EVO Clas HE evo Combi Clas HE evo System | Zone 2 return sensor defective |
703 | E-Combi Evo E-System EVO Clas HE evo combi Clas he evo system | Zone 3 outgoing sensor defective |
704 | E-Combi Evo E-System EVO Clas HE evo Combi Clas HE evo System | Zone 3 return sensor defective |
705 | E-Combi Evo E-System EVO Clas HE evo combi Clas he evo system | Hydraulic separation sensor defective |
706 | E-Combi Evo E-System EVO Clas HE evo combi Clas he evo system | Zone 2 overheating |
707 | E-Combi Evo E-System EVO Clas HE evo Combi Clas HE evo System | Zone 3 overheating |