Can I fix Baxi H.00.81 myself?

No. It needs a Gas Safe registered engineer to diagnose. Tell them the exact code and your boiler's model name.

H.00.81

Baxi fault code

Baxi H.00.81: room unit disconnected

Engineer only

Baxi describes H.00.81 on Baxi Combi 2 and System 2 (200, 400, 600, 800, Assure 500) boilers as: room unit disconnected.

There is nothing you can safely do yourself with this one. Leave the boiler off and book an 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.

Model	Meaning
Baxi Combi 2 and System 2 (200, 400, 600, 800, Assure 500)	Room unit disconnected

Model

Meaning

Baxi Combi 2 and System 2 (200, 400, 600, 800, Assure 500)

Room unit disconnected