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Worcester Bosch Greenstar 4000 System fault 2967

The temperature difference between supply temperature sensor and temperature sensor at...

Gas boiler

What it means

Excessive temperature differential detected between supply sensor and heat exchanger sensor.

Likely causes

  1. Low flow through appliance
  2. Air locks in system
  3. Closed isolation valves
  4. Pump not operating correctly
  5. Poor sensor contact with heat exchanger assembly/pipework
  6. Faulty heat exchanger sensor (break or short circuit)
  7. Faulty supply sensor (break or short circuit)
  8. Harness fault

Where to start

  1. Check the flow through the appliance and that the system is filled
  2. Check for air locks in the system and purge if required
  3. Check the isolation valves, ensure they are open

The full answer, free

  • 11 more checks 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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