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Worcester Bosch Greenstar 4000 Combi fault 2966

Flow temperature rise in heat exchanger too rapid

Gas boiler

What it means

Rate of temperature rise in the heat exchanger detected as too rapid, indicating insufficient water flow.

Likely causes

  1. No water flow because CH system is closed
  2. No water flow because pump is not operating correctly

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

  • How to put it right, step by step
  • The manual page for this fault (page 78), 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 Combi. Check the model on the data plate before you order parts.

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