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Worcester Bosch Greenstar 4000 Combi fault 1075

Heat exchanger temp sensor short circuit

Gas boiler

What it means

Short circuit detected at the heat exchanger temperature sensor circuit.

Likely causes

  1. Faulty sensor
  2. Damaged harness
  3. Faulty PCB

Where to start

  1. Check the flow temperature sensor plug is connected
  2. Check the resistance of the flow temperature sensor
  3. Check the continuity of harness

The full answer, free

  • 7 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 76), 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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