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Worcester Bosch fault code

Worcester Bosch 232: boiler locked by external switching contact

Engineer only

Worcester Bosch describes 232 on Greenstar 4000 boilers as: boiler locked by external switching contact.

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 4000. 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 4000	Boiler locked by external switching contact

Can I fix Worcester Bosch 232 myself?

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