E.02-.47 Boiler Fault Code: What It Means on Every Brand

The E.02-.47 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.02-.47 means	Severity	DIY?
BBaxi	The Baxi E.02 – .47 fault code indicates that the boiler's control board has been unable to establish or maintain a proper connection with an externally wired device. Full guide →	Lockout — engineer likely	No
RRemehashown as E.02.47	E.02.47 is a hard lock-out code on Remeha boilers, meaning the boiler has shut itself down completely and will not attempt to restart on its own. Full guide →	Lockout — engineer likely	No

E.02-.47 brand by brand

Baxi E.02-.47

The Baxi E.02 – .47 fault code indicates that the boiler's control board has been unable to establish or maintain a proper connection with an externally wired device. This could be a room thermostat, a programmer, a smart heating controller, or any other accessory connected to the boiler's external device terminals. The boiler classifies this as a permanent fault, meaning it will lock out and refuse to fire until the underlying wiring or device issue has been physically resolved — a simple reset alone is very unlikely to clear it for good. A closely related code, E.02 – .48, points specifically to a configuration or pairing failure with the external device (for example, a wireless smart thermostat that has lost its pairing). If you see E.02 – .48 either instead of or shortly after E.02 – .47, the cause is likely a pairing or setup issue with the controller rather than a straightforward wiring fault.

Causes, fixes & costs for Baxi E.02-.47 → · All Baxi codes

Remeha E.02.47

E.02.47 is a hard lock-out code on Remeha boilers, meaning the boiler has shut itself down completely and will not attempt to restart on its own. The code indicates that the boiler's main control unit — the CU-GH PCB — has been unable to locate or establish a connection with one or more of its internal electronic function groups (sub-modules that the control board expects to communicate with during start-up and operation). In short, this is an internal electronics or communication failure rather than a gas, water pressure, or flue problem. Because it is an E-prefix code in Remeha's fault hierarchy (A = warning, H = blocking, E = lock-out), the boiler will remain off until the underlying cause is resolved and the unit is properly reset or repaired.

Causes, fixes & costs for Remeha E.02.47 → · All Remeha codes

Frequently asked questions

Is the E.02-.47 fault code the same on every boiler?

Broadly, yes — on Baxi and Remeha the E.02-.47 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.02-.47 fault myself?

Not usually. On every brand listed, E.02-.47 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.02-.47 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.