Worcester Bosch · Greenstar 1000 Combi
1023 boiler fault code
Greenstar 1000 (GR1000W 24 C NG / 30 C NG)
What 1023 means
Maximum run time including standby time reached.
A boiler fault code alone is not a gas or carbon-monoxide emergency. If you smell gas, a CO alarm sounds, or someone has possible carbon-monoxide symptoms, leave and call 0800 111 999 from outside.
Safe check: Make a note of the displayed code. Do not remove the boiler casing or inspect internal gas, electrical or combustion components.
Gas Safe registered engineer: Use only the homeowner action in your product guide. If this fault or maintenance message remains or returns, contact Worcester Bosch or a Gas Safe registered engineer.
Official source: Greenstar 1000 Installation and Maintenance Instructions 6721835943, §11.2 Fault code table (Table 34, “Indicators and fault displays”), code 1023, printed p. 92Get a Gas Safe engineer
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