What to do
- Reset the boiler
Press the restart button.
When to call a Gas Safe engineer
If it happens again, contact Ideal quoting L6. Ideal says it needs an engineer visit.
A repair visit will usually check the gas supply, the ignition electrode and the flame sensor.
- Note the model and serial number. They're on a label on the data badge, usually under the boiler or behind the front cover.
- Write down the exact code, and what the appliance was doing when it appeared.
- Check whether it's still under warranty. If it is, the repair may cost you nothing.
Quick answers
What does the Ideal L6 fault code mean?
Ideal lists L6 as a false flame lockout: the boiler has sensed a flame when it shouldn't have, and has locked out.
Can I fix Ideal L6 myself?
Engineer only (about 5 minutes to reset). Start with: reset the boiler. If it happens again, contact Ideal quoting L6. Ideal says it needs an engineer visit.
Is Ideal L6 worth repairing?
Get a quote first. If a reset doesn't clear it, an engineer needs to find the cause. Ask for a price first, especially on an older boiler.
Checked against
Last reviewed October 2026. Manufacturers update their pages, and your manual is the final word. Spotted a mistake? Email contact@appliance-error-codes.com.