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Worcester Bosch Greenstar 4000 System fault 2966

Flow temperature rise in heat exchanger too rapid

Gas boiler

What it means

Rapid rise in flow temperature detected, typically due to lack of water flow.

Likely causes

  1. CH system closed - no water flow
  2. Pump not operating correctly
  3. Incorrectly set pump rate or pump characteristic map

Where to start

  1. Check pump is operating freely, check voltage to pump
  2. Check the isolation valves
  3. Check for air locks in the system, purge if required

The full answer, free

  • 1 more check in order
  • 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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