Baxi 824 Combi 2 fault E.04.10: My Baxi boiler has stopped giving us any heating or hot water
Published 21 April 2026 · Generated by BoilerTag's diagnostic AI from an engineer's real-world submission
One of 13 real-world fault checklists on BoilerTag, across 5 boiler makes.
Most likely cause
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.
The engineer's report
A gas engineer submitted this case through BoilerTag's free fault diagnostic tool, working on a Baxi 824 Combi 2 displaying fault code E.04.10. They described the behaviour they were seeing on site as follows:
“My Baxi boiler has stopped giving us any heating or hot water. It keeps making a clicking sound, like it's trying to start up, but then it just stops. The display shows 'E.04.10' and nothing happens. The pressure gauge is reading normal, around 1.5 bar. It's really frustrating as we've got no hot water for showers.”
Before requesting the AI diagnostic, the engineer had already worked through the following checks:
“I've tried pressing the reset button a few times, but the same fault code 'E.04.10' just comes back every time. The boiler just clicks and then locks out again.”
BoilerTag's diagnostic AI then cross-checked manufacturer documentation and common trade knowledge to produce the prioritised checklist below.
Working on this appliance? Full specs and fault codes for the Baxi 824 Combi 2 → · All Baxi boilers →
Diagnostic checklist
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Commonly failed parts
- Ignition Electrode and Lead
- Flame Sensing Electrode
- Gas Valve
- Main PCB (Printed Circuit Board)
More Baxi fault codes
Sources
The AI cross-checked the following manufacturer and trade sources while producing this checklist.
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