63 High

Gledhill 63 Fault Code

The Gledhill 63 fault code means: your boiler has detected an electrical fault with one of its internal temperature sensors, preventing it from safely monitoring heat levels, so it has shut down to protect itself.. 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: SENSOR_05_SHORTED
Typical repair cost £150-250 (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 63 fault code

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

Source

Gledhill 63 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