BoilerFaultCodesIdeal 23 Fault Code
The Ideal 23 fault code means: your boiler has stopped working because its internal sensors or control system have detected a technical communication error.. It appears on 1 Ideal model in our database.
Technical description: Disconnect the connector of the sensor and press “reset”. When the same fault remains, short-circuiting in the cable loom has occurred or the control panel is defect, otherwise the sensor is defect.
What causes the Ideal 23 fault?
This fault occurs when the boiler's brain loses the ability to talk to its internal temperature sensors, usually due to a physical break in the electrical signal. The most common reason is a failed sensor that can no longer send readings, or damaged wiring that has developed a short circuit. If those components are fine, it suggests the main control board has developed a technical defect and can no longer process the information.
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 23 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 23 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