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Ariston
Fault Codes
Listed below are the common Ariston fault codes as described by the boiler manufacturer along with a possible cause.
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 |
Clas Net One, Clas One, E-Combi and E-System Error Codes
| Fault Code | Possible Cause |
|---|---|
| External printed circuit board (PCB) | |
| 411 | Room sensor circuit open or short circuit zone 1 |
| 412 | Room sensor circuit open or short circuit zone 2 |
| 414 | Room sensor circuit open or short circuit zone 3 |
| Multi-zone Heating | |
| 701 | Send sensor defective (Zone 1) |
| 702 | Send sensor defective (Zone 2) |
| 703 | Send sensor defective (Zone 3) |
| 711 | Return sensor defective (zone 1) |
| 712 | Return sensor defective (zone 2) |
| 713 | Return sensor defective (zone 3) |
| 722 | Overheating in zone 2 |
| 723 | Overheating in zone 3 |
| 750 | All heating zones locked |
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