Ariston Combi Boiler Error Codes Now, back to the Ariston boilers. Check out the table below to find your error code and see what the fault code on your Ariston boiler relates to. Ariston fault codes are generally the same across all their boilers, which makes it easier to identify the issue with your boiler.
Ariston Boiler Error Code Solutions
| Fault Code | Boiler Model | Possible Cause |
|---|---|---|
| Central Heating Circuit Issues | ||
| 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 Flow 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 |
| Fault Code | Boiler Model | Possible Cause |
|---|---|---|
| Hot Water Circuit Issues | ||
| 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 |
| Fault Code | Boiler Model | Possible Cause |
|---|---|---|
| Internal Printed Circuit Board (PCB) Issues | ||
| 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) Issues | ||
| 407 | Clas HE evo Clas he evo system E-combi evo E-system evo | 7 Room sensor circuit open/short circuit |
| Fault Code | Boiler Model | Possible Cause |
|---|---|---|
| Ignition & Detection Issues | ||
| 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 |
| 5p3 | All Boilers | 2nd ignition failed |
| 5p4 | All Boilers | Flame cut-off |
| Fault Code | Boiler Model | Possible Cause |
|---|---|---|
| Air Inlet / Flue / Gas Outlet Issues | ||
| 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 |
| Fault Code | Boiler Model | Possible Cause |
|---|---|---|
| Multi-Zone Heating Issues | ||
| 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 System Boiler Error / Fault Codes – Clas Net One, Clas One, E-Combi and E-System Boilers
| Fault Code | Boiler Model | Possible Cause |
|---|---|---|
| External Printed Circuit Board (PCB) Issues | ||
| 411 | Clas Net one Clas one E System | Room sensor circuit open or short circuit zone 1 |
| 412 | Clas Net one Clas one E System | Room sensor circuit open or short circuit zone 2 |
| 414 | Clas Net one Clas one E System | Room sensor circuit open or short circuit zone 3 |
| Multi-Zone Heating | ||
| 701 | Clas Net one Clas one E System | Send sensor defective (Zone 1) |
| 702 | Clas Net one Clas one E System | Send sensor defective (Zone 2) |
| 703 | Clas Net one Clas one E System | Send sensor defective (Zone 3) |
| 711 | Clas Net one Clas one E System | Return sensor defective (zone 1) |
| 712 | Clas Net one Clas one E System | Return sensor defective (zone 2) |
| 713 | Clas Net one Clas one E System | Return sensor defective (zone 3) |
| 722 | Clas Net one Clas one E System | Overheating in zone 2 |
| 723 | Clas Net one Clas one E System | Overheating in zone 3 |
| 750 | Clas Net one Clas one E System | All heating zones locked |