28i Low

Worcester Bosch 28i Fault Code

Also written as 28I — same fault.

The Worcester Bosch 28i fault code means: this code is not a fault; it is an informational status message indicating that your boiler is performing its standard self-check procedure ten minutes after ignition.. It appears on 2 Worcester Bosch models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: NOMINAL BOILER RATINGS (10 Minutes After Lighting) BOILER ADJUSTED FOR G20 (Natural Gas)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Worcester Bosch models that show the 28i fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch 28i fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026