BoilerFaultCodesIdeal 9P Fault Code
The Ideal 9P fault code means: your boiler's computer brain has suffered a serious internal electronic failure and can no longer communicate with the heating system.. It appears on 1 Ideal model in our database.
Technical description: Internal failure control panel or defective ModuLine.
What causes the Ideal 9P fault?
This fault occurs when the boiler's internal computer experiences a critical electronic crash or a hardware failure within its circuitry. It is usually caused by the degradation of sensitive electrical components over time or a sudden power surge that damages the communication links on the control board. When this happens, the brain of the boiler can no longer send instructions to the burner or pump, leading to a total system shutdown.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Ideal models that show the 9P fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 9P 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