BoilerFaultCodesIdeal 2F Fault Code
The Ideal 2F fault code means: your boiler has detected that there is not enough water circulating through the system or that the water is heating up too quickly.. 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.
What causes the Ideal 2F fault?
This fault occurs when the boiler senses that the water inside the unit is heating up much faster than expected, which usually points to a lack of flow. This is most commonly caused by low system pressure, a blockage in the pipes, or a failing pump that isn't pushing the water around your radiators effectively. The boiler shuts down as a safety measure to prevent the heat exchanger from overheating.
This issue is frequently seen in autumn when heating systems are turned back on after being idle all summer, which can cause internal pump components to seize.
DIY fix possible
Check the pressure gauge on the front of the boilerIf the pressure is below 1 bar, use the filling loop to top it up to 1.5 barEnsure all radiator valves are fully open to allow water to flow freelyPress the reset button to clear the fault code
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Gas Safe Register →Ideal models that show the 2F fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 2F 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