How much does it cost to fix Grant error code LOW PRESSURE?

Typical repair cost for the Grant LOW PRESSURE fault is £80-150 including labour.

LOW PRESSURE High

Grant LOW PRESSURE Fault Code

Q: What does the Grant LOW PRESSURE fault code mean?

The water pressure inside your heating system has dropped too low, so the boiler has turned itself off to prevent any damage.

Also written as LOWPRESSURE — same fault.

The Grant LOW PRESSURE fault code means: the water pressure inside your heating system has dropped too low, so the boiler has turned itself off to prevent any damage.. It appears on 5 Grant models in our database.

Technical description: The red indicator on the control panel will flash and the boiler pressure cut-out switch will activate if the water pressure falls below 0.2 bar.

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the external filling loop, which is usually a flexible silver hose connecting two valves near your boiler.Open the valves on both ends of the hose to allow water into the system until the pressure gauge needle reaches between 1.0 and 1.5 bar.Close both valves tightly and remove the hose if required by your specific installation.

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Grant models that show the LOW PRESSURE fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Grant LOW PRESSURE 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 27 April 2026