Low
30 on Baxi Solo 3

The number 30 is not a fault code for your Baxi Solo 3, but rather indicates the boiler's power output rating of 30,000 Btu/h.

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

8.79kW (30,000 Btu/h)

From this model's manual
Verified against the Baxi Solo 3 installation & service manual, page 4.
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 your boiler's control panel or user manual to see if a different error code is actually flashingEnsure your thermostat and timer are set correctly if the heating is not turning onConsult your original installation documentation to verify the model specification

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Avoid the next call-out bill

A cover plan would handle faults like 30: no call-out fees, no surprise bills.

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