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Worcester Bosch Greenstar 4000 System fault 2964

Flow rate in heat exchanger too low

Gas boiler

What it means

Flow rate through heat exchanger detected as too low.

Likely causes

  1. Low water flow through appliance
  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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