BoilerFaultCodesIdeal 4.16 Fault Code
Also written as 416 — same fault.
The Ideal 4.16 fault code means: your boiler has lost power or is suffering from a complete electronic failure, meaning the control screen is unresponsive and the heating will not operate.. It appears on 8 Ideal models in our database.
Technical description: Blank Display
What causes the Ideal 4.16 fault?
This fault occurs when the boiler's internal computer brain loses its electrical supply or suffers a terminal hardware failure. It is typically caused by a blown fuse on the control board or a malfunction within the main circuit board that prevents power from reaching the screen. Because the display is dark and the controls are unresponsive, the system cannot process any requests for heating.
This fault is often seen following summer storms or winter power surges, as electrical spikes can easily blow the sensitive fuses or damage the circuit board.
DIY fix possible
Check if your home's main fuse box has tripped a circuit breaker.Ensure the boiler's isolation switch (usually a white fused spur near the unit) is turned on.Check if other appliances in the house are working to rule out a general power cut.
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Gas Safe Register →Ideal models that show the 4.16 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 4.16 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