E3 High

Gledhill E3 Fault Code

The Gledhill E3 fault code means: your boiler has stopped working because it has detected that the water inside has become dangerously hot.. It appears on 1 Gledhill model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: reading > 99oC
Typical repair cost £120-£350 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Gledhill models that show the E3 fault code

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

Source

Gledhill E3 fault code information on this page is sourced and cross-checked against the official Gledhill service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026