Ariston Boiler Error Codes

Ariston Boiler Error Codes

Ariston Error Codes

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.


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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

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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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  • See the common problems and get repair advice for your Ariston boiler