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.
Quick answers
What does the Baxi H.02.07 fault code mean?
The water pressure in the heating circuit is too low. Baxi lists A.02.06 as low system pressure, and H.02.07 as low pressure that has become permanent. 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.
Can I fix Baxi H.02.07 myself?
Easy (about 15 minutes). Start with: read the digital gauge; top up with the Easyfill link; look for leaks. 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.
Is Baxi H.02.07 worth repairing?
Usually free. Topping up costs nothing. If the pressure keeps dropping, an engineer needs to find why.
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 October 2026. Manufacturers update their pages, and your manual is the final word. Spotted a mistake? Email contact@appliance-error-codes.com.