BoilerFaultCodesGrant EE8 Fault Code
The Grant EE8 fault code means: your boiler's main control board has lost contact with the digital display or internal computer, meaning it can no longer send or receive instructions.. It appears on 2 Grant models in our database.
Technical description: Communication failure
What causes the Grant EE8 fault?
This fault occurs when the 'brain' of the boiler and the control panel stop speaking to each other, often due to a loose internal connection or a component failure. It is usually caused by a surge in the electrical supply or moisture affecting the sensitive circuitry inside the casing. Because the two parts cannot sync, the boiler shuts down as a safety precaution because it can no longer monitor its own sensors.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Search the official register for a qualified engineer in your area.
Gas Safe Register →Grant models that show the EE8 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Grant EE8 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