Boilers · Fault code
Ideal boiler F1 and L2 fault codes
Short answer
On Ideal Logic boilers, F1 means the system water pressure is too low — usually below about 0.5 bar — and L2 means the boiler tried to light, failed, and locked out. F1 you can often fix yourself by re-pressurising. L2 is an ignition lockout, usually caused by a gas supply problem, a frozen condensate pipe or the ignition parts.
What changes the answer
- F1: the pressure gauge reading, and whether it keeps dropping
- L2: whether other gas appliances work, and the weather
What you can check yourself
- F1: top up to about 1 to 1.5 bar cold using the filling loop, following the manual, then reset
- L2: check the gas supply and condensate pipe, then reset once
What to do next
If F1 keeps returning, there is a leak to find. If L2 returns after a reset, book a repair. Never take the casing off a gas boiler. Anything inside the case is a job for a Registered Gas Installer.
This page gives general information only. Christy needs to see your system — in person or from your photos — before he can give you firm advice or a price.