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Worcester Bosch Greenstar 4000 System fault 1065

System pressure sensor faulty or not connected

Gas boiler

What it means

Service warning (W category) - system pressure sensor faulty or disconnected.

Likely causes

  1. Disconnected pressure sensor plug
  2. Broken or shorted pressure sensor connecting leads
  3. Faulty pressure sensor

Where to start

  1. Check the plug is connected correctly to the pressure sensor
  2. Check pressure sensor connecting leads for breaks or short circuits

The full answer, free

  • 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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