E85 739 High

Potterton E85 739 Fault Code

Also written as E85739 — same fault.

The Potterton E85 739 fault code means: your boiler is struggling to light because the part responsible for creating the spark to start the flame is failing or worn out.. It appears on 1 Potterton 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: Ignition Electrode & leadc/w Gasket & 2 screws
Typical repair cost £180-280 (including labour)

Engineer required

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

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Potterton models that show the E85 739 fault code

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

Source

Potterton E85 739 fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.

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