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Worcester Bosch fault code

Worcester Bosch 815: low loss header temperature sensor faulty

Engineer only

Worcester Bosch describes 815 on Greenstar 8000 Life boilers as: low loss header temperature sensor faulty.

What you can safely do

There is nothing you can safely do yourself with this one. Leave the boiler off and book an engineer.

Find a Gas Safe engineer near you Opens the official Gas Safe Register search.

Applies to: Greenstar 8000 Life. Codes can differ between models, so check your manual.

From Worcester Bosch's own fault tables. Your model name is usually on the front of the boiler or in the user manual.

Model	Meaning
Greenstar 8000 Life	Low loss header temperature sensor faulty

Can I fix Worcester Bosch 815 myself?

No. It needs a Gas Safe registered engineer to diagnose. Tell them the exact code and your boiler's model name.