H-- Low

Worcester Bosch H-- Fault Code

Also written as H — same fault.

The Worcester Bosch H-- fault code means: your boiler is operating normally and there are no currently recorded maintenance tasks or errors that require your attention.. 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: No maintenance request messages available.

DIY fix possible

This fault may be fixable without an engineer. Check your manual first.

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Worcester Bosch models that show the H-- fault code

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

Source

Worcester Bosch H-- 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