What it means
These codes are used by the Baxi 200, 400, 600 and 800 Combi 2, the 600 and 800 System 2 and the Assure 500 Combi 2 and System 2. Baxi's guide for boilers with a digital pressure gauge names A.02.06 and H.02.07 as the low pressure codes.
What to check, in order
- Read the digital gauge
Baxi says the pressure should be between 1 and 2 bar.
- Top up with the Easyfill link
It's the green filling link underneath the boiler. Baxi's video shows how: watch it right to the end before you start.
- Look for leaks
Check pipes, radiators and valves for rust, corrosion or staining.
When to call a Gas Safe engineer
If you keep having to top it up, call a Gas Safe registered engineer. Baxi says the expansion vessel or the pressure relief valve may need attention.
Good to know
- Baxi also lists E.02.39: the minimum pressure wasn't reached after 6 minutes of automatic filling.
Checked against
- Baxi: boiler error codes (list for engineers)
- Baxi: how to repressurise a boiler with a digital pressure gauge
- Baxi: why is my boiler pressure low
Last reviewed September 2026. Manufacturers update their pages, and your manual is the final word.