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Ideal boiler L2 fault code: what it means and what to do
L2 on an Ideal boiler means ignition lockout: it tried to light and couldn’t. Newer Logic Max boilers show the words Ignition Lockout instead. A frozen condensate pipe is one of the most common causes.
- L2ignition lockout
- L5too many resets in 15 minutes
- 1 to 1.5bar for F1 low pressure
L2ignition lockout
Ideal Logic boilers are in a lot of Fife homes, and L2 is the code we hear about most from their owners, especially in a cold snap.
Ideal calls it flame loss or ignition lockout. The boiler tried to light, didn’t detect a flame, and shut down to stay safe. Depending on the model, you’ll see L2, L02, or the words Ignition Lockout on the display.
Here’s what Ideal says to check before you call anyone.
What causes L2
Start with the condensate pipe.
Ideal’s own troubleshooting guides say the first thing to check is the condensate pipe. In freezing weather it ices up, the boiler gurgles, then locks out with L2.
Ideal’s checks
- Gurgling when it tries to fire
- Credit on a pay-as-you-go gas meter
- The yellow gas valve under the boiler is open
- Your other gas appliances are working
If nothing on gas works, the problem is with the supply, not the boiler.
Thawing the pipe
Ideal says to use a hot water bottle, a microwave heat pack or a warm damp cloth on the frozen part. Never boiling water, and don’t try to thaw pipework above ground level.
Checking the boiler
How to restart an Ideal
After you’ve found and fixed the cause.
Fix the cause
Thaw the pipe, top up the meter or open the gas valve first.
Press Restart
Press the Restart button on the front. The boiler will run through its lighting sequence again.
Give it a minute
If it lights, you’re done. Keep an eye on it if the frost carries on.
Don’t keep pressing
If L2 comes back, stop. Restart it too many times in 15 minutes and it locks out with L5. Ideal says switch the power off and on to clear that, but if you’ve got that far, restarting isn’t fixing it.
Our advice
One or two restarts after you’ve fixed something. If it still won’t light, Ideal says call a Gas Safe registered engineer.
L2 and the codes it gets mixed up with
| What it means | What to do | |
|---|---|---|
| L2 or L02 | Ignition lockout | Check the condensate pipe, gas and meter, then Restart |
| F2 | Flame loss | Same checks as L2 |
| F1 | Low water pressure | Top up to 1 to 1.5 bar |
| L1 | Overheat or no water flow | Check radiator valves are open and pressure is 1 to 1.5 bar, then Restart |
| L5 | Restarted too many times in 15 minutes | Switch the power off and on, then call an engineer |
From Ideal’s fault code page and Logic user guides, checked 2 November 2026. Codes vary a little between models, so check your manual.
What should I do next?
- Gurgling, freezing outsideThaw the pipe
Then press Restart.
- Showing F1Top up the pressure
1 to 1.5 bar.
- L2 keeps coming backBook a repair visit
£120 including VAT, before any parts.
- Other codesFault code list
The common ones explained.
Common questions
What does L2 mean on an Ideal boiler?
Ignition lockout, or flame loss. The boiler tried to light and couldn’t detect a flame, so it shut itself down. On Logic Max boilers you’ll see the words Ignition Lockout instead of a code.
Can a frozen condensate pipe cause L2?
Yes. Ideal’s own user guides say a frozen condensate pipe makes the boiler gurgle and then lock out with L2. Thaw it gently, then press Restart.
How do I reset an Ideal boiler?
Press the Restart button. The boiler will repeat its lighting sequence. Fix whatever caused the lockout first, or it’ll lock out again.
What does L5 mean?
The boiler has been restarted too many times in 15 minutes. Ideal says turn the power off and on again to clear it, but it’s telling you restarting isn’t fixing the problem. Call a Gas Safe registered engineer.
What’s the difference between L2 and F2?
Ideal lists both with the same meaning, flame loss or ignition lockout, and the same checks.
My Ideal is still under warranty. Who should I call?
Ideal says contact them if it’s under warranty, or a Gas Safe registered engineer if it’s outside the warranty period. We can help either way.
Related pages
Sources: Ideal, fault codes; Ideal, Logic System troubleshooting; Ideal, frozen condensate pipes. Checked 2 November 2026.
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