Baxi fault diagnostics

Baxi 824 Combi 2 — E.04.10

The Baxi 824 Combi 2 displaying fault code E.04.10 indicates that the burner has failed to ignite after four attempts. This is a common fault that can be caused by several issues, including a gas supply problem, a frozen condensate pipe, or a fault with the ignition electrodes or flame sensor. The boiler is designed to lock out for safety reasons when this fault occurs. The pressure gauge reading of 1.5 bar is normal, so low system pressure is unlikely to be the cause in this instance.

Published 21st April 2026

Baxi 800

The Baxi 800 boiler intermittently heating without a fault code can be attributed to several common issues, including low system pressure, circulation problems, or issues with the thermostat or diverter valve. While no specific fault code was provided, common Baxi fault codes related to heating issues include E119 (low pressure) and E125 (circulation fault). It's crucial to address these systematically, prioritising safety and checking the simplest causes first.

Published 20th April 2026

Baxi 100HE — Ignition Lockout

The Baxi 100HE displaying an 'Ignition Lockout' fault, with no heating or hot water and no noises, indicates the boiler has failed to ignite after several attempts and has entered a safety lockout state. This is a common fault for Baxi 100HE models, particularly after cold weather, and can be caused by various issues including a blocked condensate trap, faulty ignition components, or issues with the gas supply or fan operation.

Published 12th April 2026