BoilerFaultCodesIdeal Flame On Before Gas On Fault Code
Also written as FLAMEONBEFOREGASON — same fault.
The Ideal Flame On Before Gas On fault code means: your boiler incorrectly thinks it sees a flame before it has even started the ignition process, which is a safety error that prevents it from starting up.. It appears on 3 Ideal models in our database.
Technical description: Contact Installer
What causes the Ideal Flame On Before Gas On fault?
This fault occurs when the boiler's control system detects an electrical signal suggesting a flame is already present before the gas has been turned on. The most common reason is a carbon build-up or moisture on the sensing electrode causing a false reading, or a communication error within the main circuit board.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Ideal models that show the Flame On Before Gas On fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal Flame On Before Gas On 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 7 July 2026