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Worcester Bosch Greenstar CDi Classic System ErP fault B1

Code plug not detected

Gas boiler

What it means

The boiler control system has not detected the code plug, which is required for correct operation configuration.

Likely causes

  1. Code plug not inserted correctly
  2. Faulty code plug

Where to start

  1. Insert code plug correctly
  2. Test code plug

The full answer, free

  • How to put it right, step by step
  • The manual page for this fault (page 52), 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 CDi Classic System ErP. Check the model on the data plate before you order parts.

Other Worcester Bosch Greenstar CDi Classic System ErP fault codes