How much does it cost to fix Main error code E30?

Typical repair cost for the Main E30 fault is £150-300 including labour.

E30 High

Main E30 Fault Code

Q: What does the Main E30 fault code mean?

Your boiler has detected an issue with the internal ventilation system that removes exhaust gases, so it has safely shut itself down to prevent unsafe operation.

The Main E30 fault code means: your boiler has detected an issue with the internal ventilation system that removes exhaust gases, so it has safely shut itself down to prevent unsafe operation.. It appears on 1 Main model in our database.

Technical description: Fan or fan wiring fault

Typical repair cost £150-300 (including labour)

Engineer required

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

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Main models that show the E30 fault code

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

Insul 7 Repair: £150-300

Source

Main E30 fault code information on this page is sourced and cross-checked against the official Main service / installation manuals for each affected model.

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