BoilerFaultCodesIdeal FP Fault Code
The Ideal FP fault code means: your boiler has detected that the temperature is very low and has automatically turned itself on to prevent the internal pipes from freezing.. It appears on 3 Ideal models in our database.
Technical description: Boiler is active for boiler frost protection.
What causes the Ideal FP fault?
This occurs when the sensors inside the boiler detect the water temperature has dropped below 5°C. To protect the internal components from freezing and potential cracking, the boiler automatically fires up to circulate warm water until it reaches a safe temperature. It is a protective measure rather than a failure of a part.
This code is almost exclusively seen during winter or periods of extreme cold when the ambient temperature around the boiler drops significantly.
DIY fix possible
No action is required as this is a normal automated safety feature.The code will disappear once the boiler reaches a safe internal temperature.Ensure your external condensate pipe is not frozen if the weather is extremely cold.
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Gas Safe Register →Ideal models that show the FP fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal FP 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