E.00 .20 High

Baxi E.00 .20 Fault Code

Also written as E0020 — same fault.

The Baxi E.00 .20 fault code means: your boiler has stopped working because it cannot properly read the temperature of the exhaust fumes, making it safer to shut down than risk running incorrectly.. It appears on 7 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: The flue gas temperature sensor is not connected or measured a temperature below the range SENSOR OPEN Check the operation of the sensor Check the sensor/PCB connection
Typical repair cost £120-220 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Baxi models that show the E.00 .20 fault code

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

Source

Baxi E.00 .20 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 7 July 2026