E.00.21
Baxi fault code
Baxi E.00.21: flue gas temperature sensor short-circuited, or measuring above range
Engineer only
Baxi describes E.00.21 on Baxi Combi 2 and System 2 (200, 400, 600, 800, Assure 500) boilers as: flue gas temperature sensor short-circuited, or measuring above range.
What you can safely do
There is nothing you can safely do yourself with this one. Leave the boiler off and book an engineer.
Call a Gas Safe engineer if
- Book a Gas Safe registered engineer.
Find a Gas Safe engineer near you
Opens the official Gas Safe Register search.
Applies to: Baxi Combi 2 and System 2 (200, 400, 600, 800, Assure 500). Codes can differ between models, so check your manual.