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System fault boiler electronics / basic controller

Worcester Bosch Greenstar 4000 (before May 2021)

Category
V
Remedy
▶ Wrong code plug is inserted.
▶ Check the code plug is not damaged.
▶ Replace the code plug if required.
This code also applies to:
Greenstar 4000 (from May 2021)
Source: Manufacturer manual (PDF)
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