Ariston Boilers error codes table
System one – Combi one – E-Combi – E-system- Evo Clas – He Evo (Combi and system) – All Combi 
Boilers – Clas Net one and Class E Ariston Boilers error and fault codes tables.All Ariston Boilers – All Combi Boilers – Clas Net one Combi – Clas one Combi – Clas system one and E-Combi Evo Clas He Evo (Combi and system) Error Fault Codes List:
| Ariston Central Heating Boiler Circuit errors: | Error / Fault Code: | Boiler model | Possible fault cause |
| 101 | All Boilers | Overheat | |
| 102 | E-Combi 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 / Class one Combi | Clas system one – System Pressure Greater than 3 bar | |
| 110 | All Boilers | C.H. Flow temp. probe circuit open / short circuit | |
| 112 | All Boilers | C.H. Return temp. 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 |
Ariston Boilers Clas HE evo – Clas he evo system – E-combi evo – E-system evo –
Clas Net one Combi Error Fault Codes and problems List:
| Ariston D.H.W Circuit Boiler Circuit errors: | Error / Fault Code: | Boiler model | Possible fault cause |
| 202 | Clas HE evo Clas he evo system E-combi evo E-system evo |
2’nd 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 |
DHW (Domestic Hot Water heating) 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 |
Ariston Error Fault diagnose Codes for All Boilers and E-combi one – E-System one – Clas one Combi – Clas System one:
| Ariston Internal P.CB Circuit errors: |
Error / Fault Code: | Boiler model | Possible fault cause |
| 301 | All Boilers | EEPROM error | |
| 302 | All Boilers | Communication error | |
| 303 | All Boilers | Main P.C.B. error | |
| 304 | All Boilers | Too many (>5) resets in 15 minutes | |
| 305 | All Boilers | Main P.C.B. error | |
| 306 | All Boilers | Main P.C.B. error | |
| 307 | All Boilers | Main P.C.B. error | |
| 3P9 | E-combi one E-System one Clas Net one Combi Clas one Combi Clas System one |
Sched. Maintenance Call Service. |
Ariston Clas HE evo – Clas he evo system – E-combi evo – E-system evo External P.C.B’s error :
| Ariston External P.C.B’s error: | Error / Fault Code: | Boiler model | Possible fault cause |
| 407 | Clas HE evo Clas he evo system E-combi evo E-system evo |
7 Room sensor circuit open/short circuit |
Ariston Ignition Detection error codes :
| Ariston Ignition and Detection errors: |
Error / Fault Code: | Boiler model | Possible fault cause |
| 501 | All Boilers | No flame detected | |
| 502 | All Boilers | Flame detected with gas valve closed | |
| 503 | All Boilers | Flame lift | |
| 5P1 | All Boilers | 1st Ignition Failed | |
| 5P2 | All Boilers | 2nd Ignition Failed | |
| 5P3 | All Boilers | Flame cut-of |
Ariston Boilers error codes service:
| Ariston Air Inlet / Flue gas outlet errors: | Error / Fault Code: | Boiler model | Possible fault causes |
| 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 |
Ariston Boilers error codes list by model:
| Ariston Multi-zone Heating errors: |
Error / Fault Code: | Boiler model | Possible fault cause |
| 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 |
Ariston error code Repair service:
| Ariston External P.C.Bs Boiler Faults | Error / Fault Code: | Boiler model | Possible fault cause |
| 411 | Clas Net One, Clas one, Clas System One E-Combi one and E-System one | Room sensor circuit open or short circuit zone 1 | |
| 412 | Clas Net One, Clas one, Clas System One E-Combi one and E-System one | Room sensor circuit open or short circuit zone 2 | |
| 414 | Clas Net One, Clas one, Clas System One E-Combi one and E-System one | Room sensor circuit open or short circuit zone 3 |
Repairing Ariston Boilers by error codes:
| Ariston Multi-zone Heating : |
Error / Fault Code: | Boiler model | Possible fault cause |
| 701 | Clas Net One, Clas one, Clas System One E-Combi one and E-System one | Send sensor defective (Zone 1) | |
| 702 | Clas Net One, Clas one, Clas System One E-Combi one and E-System one | Send sensor defective (Zone 2) | |
| 703 | Clas Net One, Clas one, Clas System One E-Combi one and E-System one | Send sensor defective (Zone 3) | |
| 711 | Clas Net One, Clas one, Clas System One E-Combi one and E-System one | Return sensor defective (zone 1) | |
| 712 | Clas Net One, Clas one, Clas System One E-Combi one and E-System one | Return sensor defective (zone 2) | |
| 713 | Clas Net One, Clas one, Clas System One E-Combi one and E-System one | Return sensor defective (zone 3) | |
| 722 | Clas Net One, Clas one, Clas System One E-Combi one and E-System one | Overheating in zone 2 | |
| 723 | Clas Net One, Clas one, Clas System One E-Combi one and E-System one | Overheating in zone 3 | |
| 750 | Clas Net One, Clas one, Clas System One E-Combi one and E-System one | All heating zones locked |
service – Ariston house appliances repairs – fault code by boiler model and possible fault – boiler circuit error faults – Ariston error code search – Ariston boiler appliances not heating or shotcircuit – All Ariston boilers 