Baxi · Assure System 12/15/18/24 kW (18/24 kW LPG)
28 boiler fault code
Assure System 12/15/18/24 kW (18/24 kW LPG)
Get a Gas Safe engineer
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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 28 means
Flue NTC fault
Safe check
The User Guide lists this fault but gives no code-specific homeowner repair. Note 28 exactly as shown. Do not open the boiler casing or inspect internal wiring or components.
When to contact an engineer
Arrange diagnosis by a Gas Safe registered heating engineer or your installer/annual service provider. If the display shows a spanner symbol, the User Guide says it cannot be reset by the user; contact your installer, annual service provider or Baxi Customer Support.
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 Assure System User Guide (cover: 12/15/18/24 kW; LPG 18/24 kW) · §7.1.1, Table 8 “Table of error codes” · printed p. 21
User Guide
Document 7685750, published 10 April 2018