E.02 – .47 High

Baxi E.02 – .47 Fault Code

Also written as E0247 — same fault.

The Baxi E.02 – .47 fault code means: your boiler has detected a communication problem with your external thermostat or smart controls, meaning it cannot receive the command to turn on.. It appears on 24 Baxi models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Wiring to external device error.

What causes the Baxi E.02 – .47 fault?

This fault occurs when the boiler loses its digital connection with your room thermostat or smart hub, preventing the message to 'turn on' from reaching the burner. The most common reasons are dead batteries in the wireless thermostat, a loose connection in the wiring behind the control box, or a faulty receiver component inside the boiler casing.

This fault is frequently reported in autumn when homeowners turn their heating back on for the first time and discover that thermostat batteries have drained over the summer.

Typical repair cost £80-180 (including labour)

DIY fix possible

Check if your wireless thermostat has run out of batteries and replace them.Ensure the thermostat receiver (usually near the boiler) is switched on and showing lights.Try resetting the boiler by turning the selector knob to 'R' for five seconds.Check if your internet router is on if you use smart controls like Hive or Nest.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Baxi models that show the E.02 – .47 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Baxi E.02 – .47 fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026