BoilerFaultCodesIdeal 4.6 Fault Code
Also written as 46 — same fault.
The Ideal 4.6 fault code means: your boiler's fan, which safely pushes exhaust gases out of the flue, has stopped working correctly and is preventing the boiler from firing up.. It appears on 8 Ideal models in our database.
Technical description: Fan Fault
What causes the Ideal 4.6 fault?
This fault occurs when the boiler's control system loses communication with the fan or detects that it is not spinning at the required speed. The most common reasons are a mechanical failure of the fan motor itself, a loose connection in the internal wiring, or a fault on the main circuit board that prevents power from reaching the fan.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Ideal models that show the 4.6 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 4.6 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