BoilerFaultCodesAriston 1 06 Fault Code
Also written as 106 — same fault.
The Ariston 1 06 fault code means: your boiler has detected that water is returning to the unit hotter than it was sent out, which usually means the water isn't moving through your radiators properly.. It appears on 15 Ariston models in our database.
Technical description: Insufficient circulation — Trit >Tman+10°C for 3 times
DIY fix possible
Check that all radiator valves are fully open.Ensure the boiler pressure is between 1 and 1.5 bar on the gauge.Bleed all radiators to remove trapped air which may be blocking flow.
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Ariston models that show the 1 06 fault code
Click a model for the full fault code list and model-specific repair notes.
- Clas HE 24 Repair: £120-250
- Clas HE 28 Repair: £120-250
- Clas HE 35 Repair: £120-250
- Clas HE Evo Repair: £120-250
- Clas HE R Repair: £120-250
- Clas Net One Repair: £120-250
- Clas One Repair: £120-250
- Clas System 28 Repair: £100-250
- E-Combi Evo Repair: £120-250
- E-Combi One Repair: £120-250
- E-Combi One 24 Repair: £120-£350
- E-Combi One 30 Repair: £120-250
- Egis Repair: £120-250
- Genus HE Repair: £100-350
- Microsystem 15 Repair: £120-250
Source
Ariston 1 06 fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026