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Worcester Bosch Greenstar 4000 System fault 1068

Outside temp. sensor or lambda probe faulty

Gas boiler

What it means

Service warning (W category) - outside temperature sensor or lambda probe fault.

Likely causes

  1. Poor plug connection to temperature sensor
  2. Broken or shorted connecting lead
  3. Faulty temperature sensor
  4. Faulty appliance electronics

Where to start

  1. Check the plug to the temperature sensor, connect correctly
  2. Check connecting lead for break or short circuit
  3. Check temperature sensor

The full answer, free

  • 6 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 75), 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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