Worcester Bosch · Greenstar i System ErP

H03 boiler fault code

Greenstar i System ErP

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What H03 means

Planned maintenance required — set burner-hours service interval expired.

Gas Safe engineer: Book a service with a Gas Safe registered engineer, who will reset the reminder.

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.

Safe check

This is a service reminder, not a breakdown; the boiler keeps working. Book a service with a Gas Safe registered engineer, who will reset the reminder.

When to contact an engineer

Book a service with a Gas Safe registered engineer, who will reset the reminder.

Source and provenance