BoilerFaultCodesGrant LOW PRESSURE indicator lit Fault Code
Also written as LOWPRESSUREINDICATORLIT — same fault.
The Grant LOW PRESSURE indicator lit fault code means: your boiler has stopped working because the water pressure inside your heating system has dropped too low to operate safely.. It appears on 6 Grant models in our database.
Technical description: System water pressure has fallen to below 0.2 bar and the low pressure cut-out has been activated.
DIY fix possible
Locate the external filling loop (a flexible metal hose) connected between your mains water supply and the boiler pipework.Open the small valves on both ends of the hose to allow water into the system until the pressure gauge reads between 1.0 and 1.5 bar.Firmly close both valves and ensure no water is dripping from the hose connections.
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Grant models that show the LOW PRESSURE indicator lit fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Grant LOW PRESSURE indicator lit fault code information on this page is sourced and cross-checked against the official Grant service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026