A.02.06Baxi
Baxi A.02.06: low system pressure in heating circuit
Checked against Baxi's own documentation: Baxi: boiler error codes and 1 more source. Last reviewed October 2026. How we check
You can usually fix this
Baxi describes A.02.06 on Baxi Combi 2 and System 2 (200, 400, 600, 800, Assure 500) boilers as: low system pressure in heating circuit.
Recommended pressure when cold for Baxi boilers: 1.0 to 2.0 bar.
What you can safely do
- Let the system cool and read the pressure gauge.
- Baxi says that below 1.0 bar you need to repressurise. Top up through the filling loop to between 1.0 and 2.0 bar, as your user guide describes.
- Close the filling loop fully.
Call a Gas Safe engineer if
- The pressure keeps dropping.
- You can see water leaking.
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.