Worcester Bosch · Greenstar Si Compact ErP
H11 boiler fault code
Greenstar Si Compact ErP
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What H11 means
Hot water outlet sensor defect; hot water can still be delivered but with less control.
Gas Safe engineer: Contact a Gas Safe registered engineer for diagnosis; do not reset the boiler.
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
The boiler keeps working. Hot water may still be delivered, but with less control. Do not reset it.
When to contact an engineer
Contact a Gas Safe registered engineer for diagnosis; do not reset the boiler.
Source and provenance
- Greenstar Si Compact ErP Installation, commissioning & servicing instructions 6 720 813 278 (2015/07) · §8.6 Fault codes: maintenance codes and Table 32 Locking fault and cause code listing, printed p. 70
installation, commissioning & servicing instructions
2015/07 · document 6 720 813 278