Ideal 2 / F Fault Code
Also written as 2F — same fault.
The Ideal 2 / F fault code means: your boiler has detected an inconsistent temperature reading between its internal sensors, causing it to shut down to prevent damage.. It appears on 1 Ideal model in our database.
Technical description: The difference in heat between the safety sensor and the supply sensor is too large or the supply and return sensor have been interchanged.
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 2 / F fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 2 / F 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