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Worcester Bosch Greenstar 4000 System fault 2963

The heat exchanger sensor or both supply and heat exchanger sensors are defect

Gas boiler

What it means

Fault detected in heat exchanger sensor or both supply and heat exchanger sensors.

Likely causes

  1. Low or no water flow
  2. Air locks in system
  3. Incorrectly set pump rate or pump characteristic map

Where to start

  1. Check for air locks in the system and purge if required
  2. Set the pump rate or pump characteristic map correctly and match to the maximum output

The full answer, free

  • 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.

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