Worcester Bosch · Greenstar i System Compact ErP

H11 boiler fault code

Greenstar 27i / 30i System Compact ErP

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What H11 means

Maintenance code: hot water outlet sensor defect; hot water can still be delivered but with less control.

Gas Safe engineer: Note the code and contact a Gas Safe registered engineer for diagnosis.

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.

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.

Safe check

Note the displayed code. Do not open or adjust the boiler or repeatedly reset it; contact a Gas Safe registered engineer. Hot water may still work with less control. Book a Gas Safe registered engineer.

When to contact an engineer

Note the code and contact a Gas Safe registered engineer for diagnosis.

Source and provenance

Greenstar i System Compact ErP Installation, Commissioning and Servicing Instructions 6 720 813 280 (2015/07) · §8.4 Information and service menus, Status codes, printed pp.63–64; §8.5 Fault codes (Maintenance codes + Table 35 Locking fault and cause code listing), printed p.70
installation and service instructions
2015/07 · 6 720 813 280