The Ideal L6 fault code means false flame lockout. The boiler’s safety controls are detecting a flame-related signal when a normal flame should not be present.
Ideal tells homeowners to reset the boiler once. If L6 remains, it requires an engineer visit. Do not open the casing or attempt to inspect flame-sensing or ignition components.
What does Ideal L6 mean?
Ideal’s current fault-code FAQ and user guides define L6 as false flame lockout. The code identifies the condition detected by the control system, not one certain failed part.
Manufacturer servicing literature directs engineers towards model-specific ignition, flame-detection and wiring checks. Those procedures are internal and must not be attempted by a homeowner.
Which Ideal boilers use L6?
The L6 definition is verified in Ideal material for Logic Combi ESP1, Logic Code Combi ESP1, Instinct2 and Exclusive2. Ideal’s general consumer fault-code page uses the same meaning.
Other Ideal ranges may use different displays, so confirm the exact model and user guide.
Can I reset L6?
Use only the reset or restart procedure in the boiler’s own user guide, and try it once if there are no immediate danger signs. If the code returns, stop resetting and contact Ideal under warranty or a Gas Safe registered engineer.
Repeated resets can hide an intermittent symptom without correcting the fault.
Safe checks before booking
- Photograph the closed boiler and L6 display.
- Find the exact model and serial number from accessible documents or labels.
- Note whether heating, hot water or both stopped.
- Record whether the code followed a power interruption or recent service.
- Check the warranty status.
Do not remove the front cover, touch electrodes, test wiring, adjust the gas valve or try to clean combustion components.
Is L6 the same as flame loss?
No. On the verified Ideal controls, F2 relates to flame loss or ignition lockout. L6 is false flame lockout. Both require careful diagnosis, but they describe different detected conditions.
Is L6 dangerous?
L6 is a safety-related lockout and must not be bypassed. The code alone does not prove that gas or carbon monoxide is escaping, but the boiler should not be forced to run.
If you smell gas, avoid electrical switches and flames, leave the property and call 0800 111 999. If a carbon-monoxide alarm sounds or anyone has symptoms, go outside and seek urgent advice.
What will an engineer check?
The engineer will identify the model and use the correct Ideal technical information to assess the flame-detection and ignition system, related wiring and controls. The findings determine the repair; the display code alone cannot.
The short answer
Ideal L6 means false flame lockout. Reset once using the exact user instructions. If L6 returns, leave the casing closed and arrange a qualified engineer.
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