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Worcester Bosch Greenstar 4000 System fault 2957

Boiler electr. system fault

Gas boiler

What it means

General boiler electronic system fault.

Likely causes

  1. Loose wiring on board
  2. Faulty control unit

Where to start

  1. Reset appliance electronics (factory reset)
  2. Check the electrical connections on the board (check for loose wires etc.)
  3. Check Maintenance type setting to determine reminder basis

The full answer, free

  • 1 more check in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 77), 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