Worcester Bosch · Greenstar 8000+ Regular
815 boiler fault code
Greenstar 8000+ Regular (GR8701iW 30 R / 35 R / 40 R / 45 R / 50 R)
What 815 means
Low loss header temp. sensor faulty.
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 8000+ Regular Installation and Maintenance Instructions 6721891104, §11.1.2 Fault code table (Table 29), code 815, printed p. 73Get a Gas Safe engineer
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