Worcester Bosch · Greenstar i System Compact ErP

9U boiler fault code

Greenstar 27i / 30i System Compact ErP

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What 9U means

HCM/code plug problem, faulty or not connected.

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.

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 & Service · 6 720 813 280 (2015/07) · §8.5 status/fault codes, printed pp. 62–63; Tables 35–36 locking/blocking codes, printed pp. 70–71
installation and service instructions
2015/07 · 6 720 813 280