TradeAssistIQHome

Worcester Bosch Greenstar 4000 Combi fault 2967

Temperature difference between supply sensor and heat exchanger sensor too large

Gas boiler

What it means

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

Likely causes

  1. System not filled or air locked
  2. Isolation valves closed
  3. Pump not operating correctly
  4. Poor sensor contact with heat exchanger assembly/pipework
  5. Faulty heat exchanger or supply sensor
  6. Damaged harness

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

  • 27 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 78), right under the answer
Ask about 2967 freeCreate a free account

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.

Other Worcester Bosch Greenstar 4000 Combi fault codes