BoilerFaultCodesIdeal F02 Fault Code
The Ideal F02 fault code means: your boiler has started an ignition process successfully but then lost the flame, meaning it cannot stay lit to provide heat or hot water.. It appears on 3 Ideal models in our database.
Technical description: Flame Loss
What causes the Ideal F02 fault?
This fault occurs when the boiler's control system detects that the flame has gone out unexpectedly after it was successfully lit. It is usually caused by a dirty or worn-out sensor that can no longer 'see' the flame, or an inconsistent flow of gas preventing a stable burn. In some cases, external factors like a blocked flue or debris in the burner can also cause the flame to flicker and fail.
This fault is more common during extreme cold spells, as freezing temperatures can cause the external condensate pipe to block, backed-up water then floods the combustion chamber and extinguishes the flame.
DIY fix possible
Check if other gas appliances, like a cooker hob, are working to ensure gas is being supplied to the property.Verify that your gas meter has credit if you use a pre-payment meter.Reset the boiler by turning the control knob to the 'RESET' position and holding for five seconds.
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Gas Safe Register →Ideal models that show the F02 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal F02 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