BoilerFaultCodesIdeal oF Fault Code
Also written as OF — same fault.
The Ideal oF fault code means: your boiler is currently updating its internal settings and is showing this code to indicate it has been reset during its configuration process.. It appears on 5 Ideal models in our database.
Technical description: Display status after pressing RESTART during PCB programming
What causes the Ideal oF fault?
This code appears because the boiler's internal computer has just been reset or is going through a setup process. It physically signifies that the circuit board is checking its own software settings to ensure everything is configured correctly for your home. While it looks like a fault code, it is actually just a brief status update showing that the system is rebooting.
DIY fix possible
Wait 5-10 minutes for the boiler to complete its internal programming sequence.If the code persists, ensure the boiler is not being manually reset repeatedly.If the display does not return to the normal temperature reading, turn the power off and back on at the fused spur switch.
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Gas Safe Register →Ideal models that show the oF fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal oF 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