BoilerFaultCodesIdeal F06 Fault Code
The Ideal F06 fault code means: your boiler's outdoor temperature monitor is not sending a signal, which may cause your heating to behave unpredictably based on the weather.. It appears on 3 Ideal models in our database.
Technical description: Outside Sensor Fault
What causes the Ideal F06 fault?
This fault occurs when the boiler loses communication with the small sensor located on the exterior wall of your home. It is usually caused by water ingress damaging the sensor's internal circuitry or a loose connection in the wiring that links the sensor to the boiler's main control board.
This fault is more common during autumn and winter, as heavy rain or freezing conditions can accelerate the degradation of the outdoor sensor's casing.
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 F06 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal F06 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