E167 Boiler Fault Code: What It Means on Every Brand

The E167 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 E167 means	Severity	DIY?
BBaxi	The E167 code on a Baxi boiler signals a fault with the Printed Circuit Board (PCB) — the electronic brain that coordinates every function of the boiler, from ignition and heat output to… Full guide →	Lockout — engineer likely	No
PPotterton	The E167 code on a Potterton boiler signals that the boiler's Printed Circuit Board (PCB) has detected an internal electrical fault and shut the appliance down as a safety measure. Full guide →	Lockout — engineer likely	No

E167 brand by brand

Baxi E167

The E167 code on a Baxi boiler signals a fault with the Printed Circuit Board (PCB) — the electronic brain that coordinates every function of the boiler, from ignition and heat output to safety shutdowns. When the PCB develops an internal error it cannot recover from, it triggers this lockout code and prevents the boiler from firing. Unlike temporary status codes that clear on their own, Baxi's E-prefix codes represent hard lockouts: the boiler will stay off until the fault is diagnosed and resolved. The closely related E168 code is a PCB lockout variant and is treated in the same way by engineers — both point firmly at the control board and require professional diagnosis.

Causes, fixes & costs for Baxi E167 → · All Baxi codes

Potterton E167

The E167 code on a Potterton boiler signals that the boiler's Printed Circuit Board (PCB) has detected an internal electrical fault and shut the appliance down as a safety measure. The PCB acts as the boiler's control centre — it orchestrates ignition, regulates temperature and pressure, and communicates with every sensor and component in the system. When the board itself malfunctions, or when a fault elsewhere in the wiring confuses its signals, the E167 code is the result. Because the PCB touches almost every part of the boiler, this fault can cause complete shutdowns, erratic behaviour, or repeated lockouts. This code is most commonly seen on Potterton Promax and Performa models and always requires a Gas Safe registered engineer to diagnose and rectify properly.

Causes, fixes & costs for Potterton E167 → · All Potterton codes

Frequently asked questions

Is the E167 fault code the same on every boiler?

Broadly, yes — on Baxi and Potterton the E167 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 E167 fault myself?

Not usually. On every brand listed, E167 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 E167 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.