BoilerFaultCodesIdeal C0 Fault Code
The Ideal C0 fault code means: your boiler's main control chip has lost communication with the circuit board, essentially meaning the brain and body are no longer speaking to each other.. It appears on 10 Ideal models in our database.
Technical description: BCC Activation Fault
What causes the Ideal C0 fault?
This fault occurs when the small memory chip that stores the boiler's identity fails to communicate with the main control board. The most common reason is a physical connection failure or a software glitch that causes the boiler to lose its configuration settings, rendering it unable to operate safely.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →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 27 April 2026