BoilerFaultCodesAriston 7 22 Fault Code
Also written as 722 — same fault.
The Ariston 7 22 fault code means: your boiler has detected that the water temperature in your secondary heating circuit is higher than it should be, causing the system to shut down to prevent damage.. It appears on 6 Ariston models in our database.
Technical description: Overheating in zone 2
What causes the Ariston 7 22 fault?
This fault occurs when the water temperature in your second heating zone exceeds safe limits, prompting the boiler to shut down to prevent damage. It is usually caused by a physical blockage in that specific part of the system, a failed zone valve that won't open, or a pump that isn't circulating the hot water away from the boiler quickly enough.
This issue often surfaces during the first cold spell of autumn when secondary heating zones are switched back on after being idle all summer.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ariston models that show the 7 22 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ariston 7 22 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 27 April 2026