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Worcester Bosch Greenstar 4000 System fault 233

Boiler identification module or device electronics faulty

Gas boiler

What it means

Locking fault (V category). Fault relating to the boiler identification module (code plug) or device electronics.

Likely causes

  1. Wrong code plug inserted
  2. Damaged code plug

Where to start

  1. Check that the correct code plug is inserted.
  2. Check the code plug is not damaged.
  3. Navigate to Info menu to view Current status

The full answer, free

  • 4 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 71), right under the answer
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Safety: Isolate gas and power before you open the case. If you have been into the gas side, do a tightness test, and a combustion and flue check before you hand back. Gas Safe (UK) or RGI (Ireland) work only.

From the Worcester Bosch manual for the Greenstar 4000 System. Check the model on the data plate before you order parts.

Other Worcester Bosch Greenstar 4000 System fault codes