BoilerFaultCodesIdeal 9C Fault Code
The Ideal 9C fault code means: your boiler's main control board has lost communication with its internal memory chip, meaning it cannot process the settings needed to run safely.. It appears on 1 Ideal model in our database.
Technical description: Control panel not able to detect BIM.
What causes the Ideal 9C fault?
This fault happens when the boiler's main control board loses its connection to a small plug-in memory chip called the BIM, which holds the boiler's specific identity and settings. It is usually caused by a loose connection, a failed electronic component on the circuit board, or the memory chip itself becoming faulty or corrupted. Without this vital data, the boiler cannot verify which model it is and shuts down as a safety precaution.
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 9C fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 9C 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 7 July 2026