Wiring Harness High

Baxi Wiring Harness Fault Code

Also written as WIRINGHARNESS — same fault.

The Baxi Wiring Harness fault code means: your boiler has stopped working because of a loose connection or a fault in the internal electrical wiring between the main control board and the internal components.. It appears on 1 Baxi 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: Indicator: Upper LED Flash, Middle LED Flash, Lower LED Off, Bottom LED Off. Ensure 8-way PCB connector securely pushed in. If fault persists replace Wiring Harness.
Typical repair cost £120-250 (including labour)

Engineer required

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

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Baxi models that show the Wiring Harness fault code

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

Source

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

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