BoilerFaultCodesKeston 0.6 bar Fault Code
Also written as 06BAR — same fault.
The Keston 0.6 bar fault code means: your boiler is currently reporting that the water pressure inside the system is too low to operate your hot water and heating safely.. It appears on 1 Keston model in our database.
Technical description: DHW min working pressure
DIY fix possible
Locate the filling loop (a flexible metal or plastic pipe) underneath the boiler.Slowly open the valves on the filling loop to allow cold mains water into the system.Watch the pressure gauge on the front of the boiler until it reaches the green zone, typically between 1.0 and 1.5 bar.Close both valves tightly and ensure the filling loop is fully shut off.
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Keston models that show the 0.6 bar fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Keston 0.6 bar fault code information on this page is sourced and cross-checked against the official Keston service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026