BoilerFaultCodesWhat the manual says
Manufacturer manualBoiler electr. system fault
From this model's manual
Verified against the Worcester Bosch Greenstar 8000 Life Style installation & service manual, page 79.
What causes this fault?
This fault occurs when the boiler's internal computer system detects a communication failure between the electronic control board and its connected sensors or wiring. It is typically caused by a loose connection in the internal wiring harness or a critical component failure on the printed circuit board itself.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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