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Worcester Bosch Greenstar 4000 Combi fault 1037

Outside temp. sensor faulty - heating backup operation active

Gas boiler

What it means

Fault category W. Outside temperature sensor faulty, heating backup operation active.

Likely causes

  1. Weather compensation accidentally switched on in menu
  2. Incorrect positioning of outside weather sensor
  3. Faulty weather sensor connections

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

  • 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 Combi. Check the model on the data plate before you order parts.

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