BoilerFaultCodesIdeal 6H Fault Code
The Ideal 6H fault code means: your boiler is lighting up but the flame goes out straight away, preventing the system from producing heat.. It appears on 1 Ideal model in our database.
Technical description: The ionisation (the flame) directly extinguishes after ignition.
What causes the Ideal 6H fault?
This fault occurs when the boiler successfully creates a flame, but the safety sensors fail to detect it, causing the system to shut down for safety. The most common reason is a dirty or worn-out sensing probe that can no longer 'see' the fire, or an issue with the gas valve not providing a steady enough flow to maintain the flame.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Ideal models that show the 6H fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 6H 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