Baxi · 400 Combi 2.1
H.00.42 boiler fault code
400 Combi 2.1
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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.
What H.00.42 means
Pressure sensor open/faulty
Safe check
Note the code shown on the display. Do not open, adjust or repeatedly reset the boiler. Contact a Gas Safe registered engineer.
When to contact an engineer
Note the code shown on the display. Do not open, adjust or repeatedly reset the boiler. Contact 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 400 Combi 2.1 Install & Service Manual · §11.1 p. 49 and §11.2 pp. 49–50
installation and service manual
Document 7875578-02