BoilerFaultCodesGrant EE2 Fault Code
The Grant EE2 fault code means: your boiler has detected that the water pressure in the central heating system is too low to operate safely.. It appears on 2 Grant models in our database.
Technical description: Low pressure
What causes the Grant EE2 fault?
This fault occurs when the water level within your heating system drops below the minimum required for the boiler to heat up safely. The most common reason is a slow leak from a radiator valve or joint, though it often happens after you have bled air out of your radiators without refilling the system afterwards.
This issue is more frequent in autumn when homeowners turn their heating back on for the first time or bleed their radiators to prepare for winter.
DIY fix possible
Locate the filling loop, which is usually a flexible silver hose beneath the boiler.Slowly open the small valves at either end of the hose until you hear water flowing.Watch the pressure gauge and close the valves tightly once the needle reaches between 1.0 and 1.5 bar.
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Gas Safe Register →Grant models that show the EE2 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Grant EE2 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