How much does it cost to fix Main error code E06?

Typical repair cost for the Main E06 fault is £120-200 including labour.

E06 High

Main E06 Fault Code

Q: What does the Main E06 fault code mean?

Your boiler is struggling to accurately measure the temperature of the water returning to it, so it has shut down as a precaution to prevent overheating.

The Main E06 fault code means: your boiler is struggling to accurately measure the temperature of the water returning to it, so it has shut down as a precaution to prevent overheating.. It appears on 1 Main model in our database.

Technical description: Return NTC fault

Typical repair cost £120-200 (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 E06 fault code

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

Insul 7 Repair: £120-200

Source

Main E06 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