Low
0.0 on Worcester Bosch WR325 RSF

Your boiler is simply showing you a record of the most recent error it encountered, rather than reporting an active problem right now.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

What the manual says

Manufacturer manual

The last fault occurred (if a fault has occurred, the display will show 0.0 and the last fault).

From this model's manual
Verified against the Worcester Bosch Wr325 Rsf 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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Avoid the next call-out bill

A cover plan would handle faults like 0.0: no call-out fees, no surprise bills.

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