BoilerFaultCodesIdeal Flame on before gas valve on Fault Code
Also written as FLAMEONBEFOREGASVALVEON — same fault.
The Ideal Flame on before gas valve on fault code means: your boiler has detected a flame when there shouldn't be one, which means the internal sensors or ignition parts are sending incorrect signals to the control board.. It appears on 2 Ideal models in our database.
Technical description: Flame detected before the gas valve has been commanded to open
What causes the Ideal Flame on before gas valve on fault?
This fault occurs when the boiler's control system detects an electrical current that mimics a flame, even though the gas hasn't been turned on yet. The most common reason is a buildup of carbon or moisture on the ignition electrode, which causes it to send a false 'fire' signal to the main computer. In some cases, it can also be caused by a fault within the internal wiring or the control board itself misreading the sensor data.
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 valve on fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal Flame on before gas valve 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 31 August 2026