E134 Boiler Fault Code: What It Means on Every Brand

The E134 fault code appears on 2 boiler brands — Baxi and Potterton — and on all of them it points to the same kind of problem. The details still differ by brand (thresholds, sub-codes, reset procedure), so use the table below to jump to the page for your boiler.

Lockout — engineer likely 2 brands use this code

Which brand is your boiler?

The brand is printed on the front casing. Tap your brand for the full causes, fixes and repair costs.

Brand	What E134 means	Severity	DIY?
BBaxi	The E134 code appears when the boiler's control board signals the gas valve to open and allow gas into the burner, but no gas flow is detected — and this happens repeatedly within a short… Full guide →	Lockout — engineer likely	No
PPotterton	The E134 fault code appears when the boiler's PCB (printed circuit board) has sent the signal to open the gas valve, but the boiler cannot confirm that gas is actually reaching the burner. Full guide →	Lockout — engineer likely	No

E134 brand by brand

Baxi E134

The E134 code appears when the boiler's control board signals the gas valve to open and allow gas into the burner, but no gas flow is detected — and this happens repeatedly within a short window of time. Because the boiler cannot confirm gas is actually reaching the burner, it locks out as a safety precaution rather than continuing to attempt ignition. This is fundamentally a gas supply or gas valve fault, and the boiler will not resume normal operation until the underlying cause is resolved.

Causes, fixes & costs for Baxi E134 → · All Baxi codes

Potterton E134

The E134 fault code appears when the boiler's PCB (printed circuit board) has sent the signal to open the gas valve, but the boiler cannot confirm that gas is actually reaching the burner. Because the boiler cannot establish a flame within the allowed time window, it locks out as a safety precaution. This is sometimes described as 'elapsed time gas valve open without gas' — essentially the boiler tried to fire, waited, and detected nothing. Do not repeatedly reset the boiler; if the underlying cause has not been fixed, the lockout will simply repeat, and persistent resets on a gas-flow fault carry a safety risk.

Causes, fixes & costs for Potterton E134 → · All Potterton codes

Frequently asked questions

Is the E134 fault code the same on every boiler?

Broadly, yes — on Baxi and Potterton the E134 code points to the same class of fault, and the recommended response is similar. Model-specific details such as sub-codes and reset procedures still vary, so follow the page for your own brand.

Can I fix a E134 fault myself?

Not usually. On every brand listed, E134 points to a fault that needs a suitably registered engineer to diagnose and repair. A single reset to rule out a transient glitch is reasonable; repeated resets are not.

Who should I call about a E134 fault?

For gas boilers, a Gas Safe registered engineer — it is a legal requirement for any work on the appliance. If you smell gas at any point, leave the property and call the National Gas Emergency line on 0800 111 999.

General guidance only — not a substitute for professional advice, and not certified by a registered engineer. Any work on a gas appliance must be carried out by a Gas Safe registered engineer. If you smell gas, call 0800 111 999.