Worcester Bosch · Greenstar Si Compact ErP

9U boiler fault code

Greenstar Si Compact ErP

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What 9U means

HCM/code plug problem, faulty or not connected.

Gas Safe engineer: Contact a Gas Safe registered engineer.

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 code. Do not open or adjust the boiler, or repeatedly reset it. Contact a Gas Safe registered engineer.

When to contact an engineer

Contact a Gas Safe registered engineer.

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