Low
S.00 on British Gas 330+

Your boiler is working perfectly and is currently in standby mode because your thermostat has reached the desired temperature or the heating is turned off.

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

no heating required

From this model's manual
Verified against the British Gas 330 installation & service manual, page 47.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Check if your room thermostat is set high enough to trigger a heat demandEnsure your heating programmer or timer is set to an 'on' periodCheck that the batteries in your wireless thermostat have not run out

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Avoid the next call-out bill

A cover plan would handle faults like S.00: no call-out fees, no surprise bills.

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