Unknown
E9 on Worcester Bosch Greenstar 30 CDi System

Worcester Bosch Greenstar 30 CDi System fault code E9

What the manual says

Manufacturer manual

Safety temp. limiter in CH flow has tripped. Check system pressure, check safety temp. limiters, check pump operation, check fuse on pcb, bleed appliance.

From this model's manual
Verified against the Worcester Bosch/Worcester Bosch Greenstar 30 Cdi Classic System I S 2012 2014 installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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All 11 fault codes on the Greenstar 30 CDi System

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