Ariston Boiler Error Codes

Boiler Error Codes / May 23, 2022 / By

What you find on this page:

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 CodeBoiler ModelPossible Cause
Central Heating Circuit
101All BoilersOverheat
102E-Combi Evo
E-System Evo
Clas He Evo (Combi and system)		Pressure sensor error
103All BoilersInsufficient circulation
104All BoilersInsufficient circulation
105All BoilersInsufficient circulation
106All BoilersInsufficient circulation
107All BoilersInsufficient circulation
108All Combi BoilersInsufficient water (request filling)
109Clas net one / Clas one Combi
Clas system one		System pressure greater than 3 bar
110All BoilersCentral heating Flow temperature probe circuit open / short circuit
112All BoilersCentral heating return temperature probe circuit open / short circuit
114All BoilersExternal sensor circuit open / short circuit
116All Combi and System BoilersFloor thermostat contact open
118All BoilersHeating delivery probe problem
1p1All BoilersInsufficient circulation indication
1p2All BoilersInsufficient circulation indication
1p3All BoilersInsufficient circulation indication
1p4Clas Net one Combi
Clas one Combi
Clas System one		Insufficient circulation indication
D.H.W Circuit
202Clas HE evo
Clas he evo system
E-combi evo
E-system evo		2 bottom storage temperature probe open/short circuit
204Clas HE evo
Clas he evo system
E-combi evo
E-system evo		Solar collector temperature probe open/short circuit
205E-combi one
E-System one
Clas Net one Combi
Clas one Combi		Domestic hot water in probe open circuit
207Clas HE evo
Clas he evo system
E-combi evo
E-system evo		Solar collector overheating
208Clas HE evo
Clas he evo system
E-combi evo
E-system evo		Collector frost protection temperature
Internal printed circuit board (PCB)
301All BoilersEEPROM error
302All BoilersCommunication error
303All BoilersMain printed circuit board (PCB) error
304All BoilersToo many resets (> 5) in 15 minutes
305All BoilersMain printed circuit board (PCB) error
306All BoilersMain printed circuit board (PCB) error
307All BoilersMain printed circuit board (PCB) error
3P9E-combi one
E-System one
Clas Net one Combi
Clas one Combi
Clas System one		Schedule service
External printed circuit board (PCB)
407Clas HE evo
Clas he evo system
E-combi evo
E-system evo		7 Room sensor circuit open/short circuit
Ignition and Detection
501All BoilersNo flame detected
502All BoilersFlame detected with gas valve closed
504All BoilersFlame lift
5P1All Boilers1st ignition failed
5P2All boilers2nd ignition failed
5P3All BoilersFlame cut-of
Air Inlet / Flue gas outlet
604CLAS HE R
E-Combi Evo
E-System EVO
Clas HE evo Combi
Clas HE evo System		Insufficient fan speed
610All BoilersThermofuse open
612Clas 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
701E-Combi Evo
E-System EVO
Clas HE evo combi
Clas he evo system		Zone 2 outgoing sensor defective
702E-Combi Evo
E-System EVO
Clas HE evo Combi
Clas HE evo System		Zone 2 return sensor defective
703E-Combi Evo
E-System EVO
Clas HE evo combi
Clas he evo system		Zone 3 outgoing sensor defective
704E-Combi Evo
E-System EVO
Clas HE evo Combi
Clas HE evo System		Zone 3 return sensor defective
705E-Combi Evo
E-System EVO
Clas HE evo combi
Clas he evo system		Hydraulic separation sensor defective
706E-Combi Evo
E-System EVO
Clas HE evo combi
Clas he evo system		Zone 2 overheating
707E-Combi Evo
E-System EVO
Clas HE evo Combi
Clas HE evo System		Zone 3 overheating

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