How much does it cost to fix Ideal error code 6 / C?

Typical repair cost for the Ideal 6 / C fault is £180-350 including labour.

6 / C Emergency

Ideal 6 / C Fault Code

Q: What does the Ideal 6 / C fault code mean?

Your boiler is continuing to burn gas even when it should have shut down, which means it cannot stop heating correctly.

Also written as 6C — same fault.

The Ideal 6 / C fault code means: your boiler is continuing to burn gas even when it should have shut down, which means it cannot stop heating correctly.. It appears on 1 Ideal model in our database.

Technical description: Ionisation occurs when heat is no longer required, the gas valve does not close.

Typical repair cost £180-350 (including labour)

Engineer required

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

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Ideal models that show the 6 / C fault code

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

Maximiser SE Repair: £180-350

Source

Ideal 6 / C fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.

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