What does Baxi E133 mean?

Ignition lockout / gas supply fault — the boiler failed to light and locked out.

How do I fix Baxi E133?

Try first: Check the gas is on and other appliances work; Check the condensate pipe outside isn't frozen or blocked; Press reset once. If that doesn't clear it, the likely part is Ignition electrode set.

Baxi E133 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 gas is on and other appliances work
Check the condensate pipe outside isn't frozen or blocked
Press reset once

🔧 If that doesn't fix it

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

Gas supply
Ignition electrodes
Blocked condensate
Gas valve

Most likely part: Ignition electrode set

⚠ Worth knowing

If the reset holds only briefly, the gas valve is the common follow-on repair

Fixed repair price

£180

Part + labour, no surprise callout fee. You only pay if you go ahead.

Book a Gas Safe engineer

You pick from the 3 nearest vetted engineers. Your choice gets first refusal; if they don't take it within a few hours it moves to the next nearest automatically — and we keep you posted.

Other Baxi fault codes

Baxi E119Low water pressure — system pressure has fallen below the sa…

Baxi E133 — what it means

✅ Try these first — they're free

🔧 If that doesn't fix it

⚠ Worth knowing

Other Baxi fault codes