C0 High

Ideal C0 Fault Code

The Ideal C0 fault code means: your boiler's internal memory chip has failed to communicate correctly with the main control board, meaning the system cannot identify its own settings.. It appears on 10 Ideal models 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: Boiler chip card (BCC) activation fault
Typical repair cost £120-280 (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 C0 fault code

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

Source

Ideal C0 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 31 August 2026