E43 High

Potterton E43 Fault Code

The Potterton E43 fault code means: your boiler has detected an issue with the air venting system, which is preventing it from safely clearing waste gases and starting up.. 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: Flue pressure switch fault
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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Potterton models that show the E43 fault code

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

Source

Potterton E43 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 27 April 2026