BoilerFaultCodesAriston 106 Fault Code
The Ariston 106 fault code means: your boiler has stopped working because the water returning from your radiators is significantly hotter than the water leaving the boiler, suggesting the water isn't flowing correctly.. It appears on 2 Ariston models in our database.
Technical description: Circulation issue — return > flow + 10°C (3 times)
DIY fix possible
Ensure all radiator valves (TRVs) are turned to the highest settingCheck that at least one radiator or bypass valve is fully openBleed all radiators to remove trapped air locks
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like 106: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Ariston models that show the 106 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ariston 106 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