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Worcester Bosch Greenstar 4000 System fault 1037

Outside temp. sensor faulty - heating backup operation active

Gas boiler

What it means

Service warning (W category) indicating outside temperature sensor fault, causing heating to fall back to backup operation.

Likely causes

  1. Weather compensation menu accidentally switched on
  2. Incorrectly positioned outside weather sensor
  3. Faulty weather sensor connections on control board

Where to start

  1. Check the weather compensation is applicable and the menu has not been accidentally switched on
  2. Check the positioning of the outside weather sensor
  3. Check the weather sensor connections on the control board

The full answer, free

  • 6 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 74), 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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