E25 High

Heatline E25 Fault Code

The Heatline E25 fault code means: your boiler's main control brain has developed an internal electrical error and can no longer process commands to heat your home.. It appears on 2 Heatline models 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: PCB internal fault: General electronic failure within the main control board.
Typical repair cost £280-450 (including labour)

Engineer required

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

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Heatline models that show the E25 fault code

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

Source

Heatline E25 fault code information on this page is sourced and cross-checked against the official Heatline service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026