BoilerFaultCodesIdeal 411 Fault Code
The Ideal 411 fault code means: your boiler's internal computer has encountered a critical electronic error and can no longer communicate with the rest of the system.. It appears on 2 Ideal models in our database.
Technical description: internal failure - electronic
What causes the Ideal 411 fault?
This fault occurs when the boiler's main control board suffers an internal hardware failure, essentially acting like a crashed computer that can no longer process instructions. The most common reason is electrical degradation of the board's components or a communication break in the internal wiring that prevents the system from running safely.
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 411 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 411 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