Baxi · 800 Combi 2
A.02.06 boiler fault code
800 Combi 2
Get a Gas Safe engineer
Free. Enter your postcode.
What A.02.06 means
Low system pressure in the heating circuit.
Safe check
Follow Baxi’s homeowner repressurising guide to top up the system. The guide says boiler water pressure should be between 1 and 2 bar.
When to contact an engineer
If you are unsure or cannot manage the guide procedure, contact Baxi Customer Support or a Gas Safe registered engineer.
Safety notice
A boiler fault code alone is not a gas or carbon-monoxide emergency. If you smell gas, a CO alarm sounds, anyone feels unwell, or there is an unsafe flame, leave and call 0800 111 999 from outside.
Source and provenance
- Baxi 800 Combi 2 Installation and Service Manual · §11.2, Table 33, printed p. 73
installation and service manual
7745721
- Baxi Professional error-code table · Baxi Combi and System 2 table · A.02.06
professional error-code table
Checked 30/09/2026; the online table publishes no revision
- Baxi How to repressurise a Boiler · homeowner repressurising guidance
homeowner guide
Checked 30/09/2026; the online page publishes no revision
Renting? Report it to your landlord or housing provider first. They are responsible for gas safety and boiler repairs, and the repair should not cost you.
Did this fix it?
After: Repressurise the boiler