E.04-.17 Boiler Fault Code: What It Means on Every Brand

The E.04-.17 fault code appears on 2 boiler brands — Baxi and Remeha — 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 E.04-.17 means	Severity	DIY?
BBaxi	The E.04-.17 code is a permanent lockout fault on Baxi boilers, triggered when the boiler's control system detects a problem with the gas valve or the gas-air unit (sometimes called the… Full guide →	Lockout — engineer likely	No
RRemehashown as E.04.17	The E.04.17 fault code on a Remeha boiler indicates that the internal electronic driver responsible for controlling the gas valve has failed or is not functioning correctly. Full guide →	Lockout — engineer likely	No

E.04-.17 brand by brand

Baxi E.04-.17

The E.04-.17 code is a permanent lockout fault on Baxi boilers, triggered when the boiler's control system detects a problem with the gas valve or the gas-air unit (sometimes called the venturi assembly). Because the boiler cannot verify safe gas control, it shuts down completely and will not restart by itself — a simple reset alone will not clear this fault unless the underlying cause is first resolved. The code specifically points to an electrical or mechanical failure in the gas valve control circuit, meaning the component responsible for regulating how gas reaches the burner is either not responding correctly or has failed outright.

Causes, fixes & costs for Baxi E.04-.17 → · All Baxi codes

Remeha E.04.17

The E.04.17 fault code on a Remeha boiler indicates that the internal electronic driver responsible for controlling the gas valve has failed or is not functioning correctly. In practical terms, the boiler's control system cannot send a reliable signal to open or close the gas valve, so the burner cannot operate safely. As a result, the boiler locks itself out immediately to prevent any gas-related hazard. This code falls within the E.04 group, which covers gas valve control and ignition electronics, and is most commonly seen on Remeha Quinta Ace and other Ace-generation models.

Causes, fixes & costs for Remeha E.04.17 → · All Remeha codes

Frequently asked questions

Is the E.04-.17 fault code the same on every boiler?

Broadly, yes — on Baxi and Remeha the E.04-.17 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 E.04-.17 fault myself?

Not usually. On every brand listed, E.04-.17 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 E.04-.17 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.