BoilerFaultCodesAriston B06 Fault Code
The Ariston B06 fault code means: your boiler has detected that the water pressure inside the system is not at the correct level to operate safely.. It appears on 3 Ariston models in our database.
Technical description: Pressure Switch for Heating Circuit
DIY fix possible
Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.If the pressure is too low, use the external filling loop valves to carefully top up the system with water.If the pressure is correct but the code remains, try resetting the boiler using the 'R' or reset button.
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 B06: 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 B06 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ariston B06 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