Worcester Bosch · Greenstar 4000 System

1037 boiler fault code

Greenstar 4000 System (GR4700iW S)

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What 1037 means

Outside temp. sensor faulty - heating back-up operation active.

Home step: Make a note of the displayed code. Do not remove the boiler casing or inspect internal gas, electrical or combustion components.

Gas Safe registered engineer: Use only the homeowner action in your product guide. If this fault or maintenance message remains or returns, contact Worcester Bosch or a Gas Safe registered engineer.

A boiler fault code alone is not a gas or carbon-monoxide emergency. If you smell gas, a CO alarm sounds, or someone has possible carbon-monoxide symptoms, leave and call 0800 111 999 from outside.

Renting? Report it to your landlord or housing provider first. They are responsible for gas safety and boiler repairs, and the repair should not cost you.

Safe check

Make a note of the displayed code. Do not remove the boiler casing or inspect internal gas, electrical or combustion components.

When to contact an engineer

Use only the homeowner action in your product guide. If this fault or maintenance message remains or returns, contact Worcester Bosch or a Gas Safe registered engineer.

Source and provenance

Greenstar 4000 System Installation Manual · 6 720 891 162 · §10.1.2 Operating/Fault code table (Table 31), code 1037, printed p. 74
installation and maintenance instructions
2020/09 · listed for appliances manufactured from 17/05/2021 onwards