How much does it cost to fix Ideal error code Flame On Before Gas On?

Typical repair cost for the Ideal Flame On Before Gas On fault is £120-350 including labour.

Flame On Before Gas On Emergency

Ideal Flame On Before Gas On Fault Code

Q: What does the Ideal Flame On Before Gas On fault code mean?

Your boiler's safety sensor detects a flame before the gas valve has even been told to open, which usually means a internal component is stuck or sending a false signal.

Also written as FLAMEONBEFOREGASON — same fault.

The Ideal Flame On Before Gas On fault code means: your boiler's safety sensor detects a flame before the gas valve has even been told to open, which usually means a internal component is stuck or sending a false signal.. It appears on 5 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 senses a flame signal at a time when there should not be any fire present in the burner. The most common reason is an internal electronic failure where the sensing probe sends a false signal, or the gas valve has failed to close properly and is leaking fuel into the combustion chamber.

Typical repair cost £120-350 (including labour)

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 27 April 2026