BoilerFaultCodesPotterton Below Minimum Fault Code
Also written as BELOWMINIMUM — same fault.
The Potterton Below Minimum fault code means: your boiler has stopped working because the water pressure inside the heating system has dropped too low.. It appears on 1 Potterton model in our database.
Technical description: System pressure below minimum
DIY fix possible
Locate the filling loop, which is a silver braided hose under your boiler connecting two pipes.Open the valves on both ends of the hose to allow water into the system.Watch the pressure gauge on the front of the boiler until the needle reaches the green zone (typically 1.0 to 1.5 bar).Close both valves tightly and remove the hose if required.
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Potterton models that show the Below Minimum fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton Below Minimum fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026