H08 Low

Worcester Bosch H08 Fault Code

The Worcester Bosch H08 fault code means: your boiler has reached its programmed service interval and is kindly reminding you that it is time for a routine professional safety check.. 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: The set interview date has expired. Maintenance required.
Typical repair cost £90-130 (including labour)

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 H08 fault code

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

Source

Worcester Bosch H08 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 27 April 2026