- Boilers
- Gas boiler
E.01.04
Baxi E.01.04 on a gas boiler: flame lost 5 times in 24 hours
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
Baxi E.01.04 means the Neodens Lite has lost its flame five times in 24 hours and locked out. Baxi points to the gas supply, electrodes, flue ducts, a dirty heat exchanger or mains voltage. Reset once and call a technician if it returns.
Safety first
Stop and check this first
- If you smell gas, do not reset: do not light flames or use switches, shut off the gas, open windows, leave the home and call your gas distributor's emergency number and a qualified professional from outside, as Baxi instructs.
- If you smell combustion fumes, Baxi says to switch the boiler off, open windows, leave and call a professional. Headache, dizziness or nausea can mean carbon monoxide. Baxi recommends smoke and CO alarms in the home.
- Five flame losses in a day are not normal: do not reset several times in a row. Baxi says that if faults appear frequently, a qualified technician must be called.
Safe checks you can perform
- Smell of gas or fumes near the boiler
- H.03.02 warnings in the hours before
- Flue terminal seen from outside
- Single reset with the RESET key
- Gas, electrode, ducts and heat exchanger by the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Gas pressure and valve calibration
- Do not attempt this professional task: Electrode and air and flue duct check
- Do not attempt this professional task: Heat exchanger cleaning and combustion analysis
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Gas pressure and valve calibration
What they doThe technician measures the gas supply pressure with the boiler running and checks the gas valve calibration.
They must show youthe gauge reading.
In writingthe pressure measured against the manufacturer's specification and the adjustment made.
Electrode and air and flue duct check
What they doThey check the electrode wiring and condition, and the air inlet and flue gas exhaust for blockages or leaks.
They must show youthe electrode and duct checked, with a photo.
In writingwhat was cleaned, corrected or replaced.
Heat exchanger cleaning and combustion analysis
What they doThey check the cleanliness of the heat exchanger on the flue side, clean it if blocked and measure combustion with an analyser.
They must show youthe analyser printout.
In writingthe values measured against the manufacturer's specification.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Smell of gas or fumes near the boiler
- Who:
- you.
- How:
- go near without turning on lights or using switches and notice whether there is a smell of gas or combustion fumes, or whether anyone has a headache or dizziness.
- Result that matters:
- whether it is safe to continue.
- If you smell gas or fumes:
- follow the warnings on this page and do not reset.
- If there is no smell:
- move on to the earlier warnings.
- Evidence to keep:
- the time and what you noticed.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
H.03.02 warnings in the hours before
- Who:
- you.
- How:
- recall or ask at home whether H.03.02, temporary flame loss, appeared before the lockout, or whether the hot water suddenly went cold.
- Result that matters:
- when the flame losses started.
- If it happened with other gas appliances on:
- note it for the technician.
- If it happened during power dips:
- note that too.
- Evidence to keep:
- approximate times and what was running.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
Flue terminal seen from outside
- Who:
- you.
- How:
- from the street, the yard or the ground, without climbing onto roofs or touching pipes, look at whether the flue terminal is covered by ice, nests, plastic or objects.
- Result that matters:
- whether there is a visible blockage.
- If it is covered:
- do not use the boiler and call the technician.
- If it looks clear:
- move on to the single reset.
- Evidence to keep:
- photo of the terminal.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
Single reset with the RESET key
- Who:
- you.
- How:
- with no smell of gas or fumes, press the manual reset (RESET) key for 1 second, as Baxi says for E faults. Once only.
- Result that matters:
- whether the boiler keeps its flame.
- If it works:
- watch whether H.03.02 returns in the next few days.
- If the lockout returns:
- do not insist and call the technician.
- Evidence to keep:
- photo of the display and the result.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
Gas, electrode, ducts and heat exchanger by the technician
- Who:
- qualified gas technician.
- How:
- measures gas pressure and checks valve calibration, the electrode, the air inlet and exhaust, heat exchanger cleanliness and mains voltage.
- Result that matters:
- which of the five Baxi groups explains the flame losses.
- If gas or voltage is at fault:
- action is taken outside the boiler.
- If a part is faulty or dirty:
- it is cleaned, adjusted or replaced and combustion is measured.
- Evidence to keep:
- measured values and analyser printout.
Baxi says to disconnect the power and close the gas tap before working on the boiler. Cleaning the heat exchanger or touching the valve is technician work.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Boilers
- Brand
- Baxi
- Product type
- Gas boiler
Known code variants
- Baxi E.01.04
- E 01 04
- E.01 .04
- E01.04
- E0104
- Neodens Lite E.01.04
What it means
On the Baxi Neodens Lite, E.01.04 is a permanent fault: flame loss detected five times in 24 hours. Before it, the temporary warning H.03.02, temporary flame loss, is often shown. Baxi gives five groups of causes: gas supply (supply pressure and gas valve calibration), electrode (wiring, connection and condition), flue gas ducts (air inlet and exhaust), a heat exchanger blocked on the flue gas side and mains voltage. It is reset with the RESET key for 1 second.
Warnings and stop conditions
- Criticalsource verified
If you smell gas, do not reset: do not light flames or use switches, shut off the gas, open windows, leave the home and call your gas distributor's emergency number and a qualified professional from outside, as Baxi instructs.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
- Criticalsource verified
If you smell combustion fumes, Baxi says to switch the boiler off, open windows, leave and call a professional. Headache, dizziness or nausea can mean carbon monoxide. Baxi recommends smoke and CO alarms in the home.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
- Highsource verified
Five flame losses in a day are not normal: do not reset several times in a row. Baxi says that if faults appear frequently, a qualified technician must be called.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
Symptoms and causes
Probable causes · in order
- Irregular gas supplyCommon
Baxi says to check the gas supply pressure and the valve calibration. It fits if the flame goes out when other gas appliances run at the same time.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
- Detection electrode dirty or badly connectedPossible
If the electrode senses the flame poorly, the boiler thinks it has gone out. Baxi says to check its wiring, connection and condition.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
- Problem with the air inlet or flue outletPossible
Baxi lists the air inlet and exhaust ducts. A covered terminal or a badly fitted duct starves the flame again and again.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
- Heat exchanger dirty on the flue sidePossible
Baxi describes it as a heat exchanger blocked on the flue gas side. It is fixed by cleaning at the annual service.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
- Low or unstable mains voltageLess common
The table says to check the supply voltage. It fits if flame losses coincide with power dips; Baxi has H.03.54 for shutdown due to low voltage.
Evidence: Baxi Neodens Lite 24 AF, 24/24 F y 28/28 F, manual de usuario, instalación y mantenimiento 7892434
Virtual technician
Does E.01.04 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
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