BoilerTool
Home / Greenstar 4000 Combi / Heat-up takes too long.
Heat-up takes too long.

Faults that are not displayed

Worcester Bosch Greenstar 4000 Combi

Category
-
Remedy
▶ Set the pump rate or pump characteristic map correctly and match to the maximum output.
This code also applies to:
Greenstar 2000 CombiGreenstar 4000 System
Source: Manufacturer manual (PDF)
hello@boilertool.co.uk
© 2026 BoilerTool