BoilerFaultCodesIdeal Float switch Fault Code
Also written as FLOATSWITCH — same fault.
The Ideal Float switch fault code means: your boiler has detected that the water levels inside the system are incorrect, or the sensor that monitors the water level is faulty.. It appears on 2 Ideal models in our database.
Technical description: Float switch fault detected by diagnostic feature.
What causes the Ideal Float switch fault?
This fault occurs when the internal water level sensor fails to signal that the boiler has sufficient water to operate safely. The most common reasons are a physical blockage or debris interfering with the float's movement, or an electrical failure within the sensor itself that prevents it from communicating with the main control board.
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 Float switch fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal Float switch 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