What does Baxi L1 mean?

Overheat lockout — the boiler shut down to protect itself.

How do I fix Baxi L1?

Try first: Check the pressure gauge reads about 1–1.5 bar; Bleed your radiators to clear trapped air; Press the reset button once. If that doesn't clear it, the likely part is Pump or circulation.

Baxi L1 Fault — What It Means & Fix Cost

⚠ This is the likely cause from the code — a Gas Safe registered engineer confirms it on site. If you can smell gas, stop and ring 0800 111 999.

✅ Try these first — they're free

Often clears it without a callout:

Check the pressure gauge reads about 1–1.5 bar
Bleed your radiators to clear trapped air
Press the reset button once

🔧 If that doesn't fix it

The likely cause is one of these — the engineer confirms which:

Most likely part: Pump or circulation

Fixed repair price

£456

Inc. VAT — part & labour, no surprise callout fee. You only pay if you go ahead.

A vetted Gas Safe engineer who covers your postcode will call you back to arrange the repair. No callout fee — you only pay if you go ahead.

Other Baxi fault codes

Baxi E119Low water pressure (below 0.5 bar).…Baxi E133Ignition failure — often a gas supply issue or a frozen cond…Baxi E160Fan fault or a flue blockage.…Baxi E168Power supply fault or system lockout.…

Baxi L1 — what it means

✅ Try these first — they're free

🔧 If that doesn't fix it

Other Baxi fault codes

Book your repair