- Boilers
- Gas boiler
E128
Baxi E128 on a gas boiler: flame lost
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
Baxi E128 means flame loss: the burner went out while the boiler was running. Check the yellow gas tap is open and other gas appliances work; reset once by holding reset for 2 seconds.
Safety first
Stop and check this first
- If the flame keeps going out, stop resetting and do not leave the boiler cycling through ignitions: Baxi locks it after 5 attempts. Do not touch the burner, electrodes or flue.
- If you smell gas: switch the boiler off, do not operate any electrical device or switch on lights, put out any flame, open the windows and leave; from outside, call your gas distributor's emergency number and the service centre. If you smell combustion fumes, switch the boiler off, ventilate and call the service centre.
Safe checks you can perform
- Gas tap and other gas appliances
- One reset with the reset key
- Combustion check by a gas technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Gas pressure measurement
- Do not attempt this professional task: Combustion analysis and flame detection check
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 measurement
What they doThe technician measures gas pressure at the boiler inlet with a manometer while the burner runs.
They must show youthe measured value against the rating plate.
In writingthe measured pressure and whether it was a supply problem.
Combustion analysis and flame detection check
What they doWith a combustion analyser, the technician measures the flue gases and checks the detection electrode and the flue.
They must show youthe analyser printout and the electrode inspected.
In writingthe measured values and any part replaced with the reason.
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.
Gas tap and other gas appliances
- Who:
- you.
- How:
- check the yellow gas tap under the boiler is open, as Baxi requires for start-up, and see whether the gas hob lights. Do not touch anything inside the boiler.
- Result that matters:
- whether gas reaches the home and the tap is open.
- If the tap was closed or the hob does not light either:
- it is a supply problem; open it or call your distributor.
- If there is gas in the home:
- the cut is in the boiler or its flue; go on to the reset.
- Evidence to keep:
- a photo of the tap position and a note of whether the hob worked.
Evidence: Baxi Platinum Compact ECO, instrucciones de funcionamiento y mantenimiento para el usuario
One reset with the reset key
- Who:
- you.
- How:
- hold reset for at least 2 seconds, as Baxi says for 128. Baxi accepts 5 consecutive resets and then a 15 minute wait; do one.
- Result that matters:
- whether the burner lights and stays lit.
- If it stays lit:
- note the date; if it repeats, Baxi asks for the service centre.
- If the flame is lost again:
- stop; leave the boiler off and call the service centre.
- Evidence to keep:
- a photo of the code and a note of the time and whether it was heating or making hot water.
Evidence: Baxi Platinum Compact ECO, instrucciones de funcionamiento y mantenimiento para el usuario
Combustion check by a gas technician
- Who:
- registered gas technician from the service network.
- How:
- measures gas pressure at the boiler inlet, checks the flue and flame detection and runs a combustion analysis.
- Result that matters:
- whether gas pressure, combustion and the flame signal are within Baxi's specification.
- If gas pressure is low or flue gases do not clear:
- that confirms a cause outside the burner.
- If all of that is fine:
- it points to flame detection or the burner.
- Evidence to keep:
- a report with the gas pressure, the combustion analysis result and any part replaced.
Gas, burner, electrodes, flue and gas valve are for a registered gas technician only.
Evidence: Baxi Platinum Compact ECO, instrucciones de funcionamiento y mantenimiento para el usuario
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
- 128
- Baxi 128
- Baxi E 128
- Error 128 Baxi
- Platinum Compact 128
What it means
On the Platinum Compact ECO, code 128 is flame loss, different from 133 (no ignition after 5 attempts) and 129 (flame lost during ignition). The control watches the flame and shuts off the gas when it stops detecting it. Causes include the gas supply, the flue or air intake, flame detection or the burner itself. Baxi lets you reset it, but the code does not say which of those systems failed.
Warnings and stop conditions
- Higheditorial warning
If the flame keeps going out, stop resetting and do not leave the boiler cycling through ignitions: Baxi locks it after 5 attempts. Do not touch the burner, electrodes or flue.
Evidence: Baxi Platinum Compact ECO, instrucciones de funcionamiento y mantenimiento para el usuario
- Criticalsource verified
If you smell gas: switch the boiler off, do not operate any electrical device or switch on lights, put out any flame, open the windows and leave; from outside, call your gas distributor's emergency number and the service centre. If you smell combustion fumes, switch the boiler off, ventilate and call the service centre.
Evidence: Baxi Platinum Compact ECO, instrucciones de funcionamiento y mantenimiento para el usuario
Symptoms and causes
Probable causes · in order
- Gas supply cut or lowCommon
If the hob or other gas appliances also fail, or the yellow tap was closed, the problem is upstream of the boiler.
Evidence: Baxi Platinum Compact ECO, instrucciones de funcionamiento y mantenimiento para el usuario
- Flue or air intakePossible
A blocked terminal or damaged duct upsets combustion; it often shows in wind or after work on the facade.
Evidence: Baxi Platinum Compact ECO, instrucciones de funcionamiento y mantenimiento para el usuario
- Flame detection or burnerPossible
With gas and flue fine, the detection electrode or the burner remain as suspects; the technician confirms it by measuring.
Evidence: Baxi Platinum Compact ECO, instrucciones de funcionamiento y mantenimiento para el usuario
Virtual technician
Does E128 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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