- Boilers
- Gas boiler
E134
Baxi E134 on a gas boiler: gas valve blocked
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
Baxi E134 means gas valve blocked. Check that the yellow gas tap is open and press the reset key for at least 2 seconds, once. If it returns or keeps repeating, call the authorised service centre.
Safety first
Stop and check this first
- If you smell gas: Baxi says to switch the boiler off, not to operate any electrical device or switch on lights, to put out any flame and open the windows. Then leave the home and call your gas distributor's emergency number and the service centre from outside.
- If you smell combustion fumes: Baxi says to switch the boiler off, air the room by opening doors and windows and call the service centre. Carbon monoxide has no smell; if anyone has a headache, dizziness or nausea, get outside and seek help. A CO alarm near the boiler gives early warning.
- Do not chain resets: after 5 attempts in a row the boiler stays locked for 15 minutes. If 134 appears often, Baxi says to contact the authorised technical service.
Safe checks you can perform
- Gas or combustion smell
- Yellow gas tap
- One reset with the off and reset key
- Secondary code in the information menu
- Gas pressure, electrodes and board checked by the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Gas supply pressure
- Do not attempt this professional task: Electrodes and their wiring
- Do not attempt this professional task: Automatic calibration and combustion analysis
- Do not attempt this professional task: Board replacement, only if needed
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 supply pressure
What they doThe technician measures the supply pressure with a gauge at the gas valve pressure test point, with the boiler off and running.
They must show youthe value measured against the manufacturer's specification.
In writingthe pressure measured and whether the problem is in the supply or the boiler.
Electrodes and their wiring
What they doThe technician checks the condition and position of the detection and ignition electrodes against the positioning figure in the manual, and the continuity of their cables.
They must show youthe electrodes and their position, with a photo.
In writingif replaced, the part number and why.
Automatic calibration and combustion analysis
What they doIf the gas valve, detection electrode or burner is replaced, the technician runs the automatic calibration and checks CO2 with a calibrated analyser.
They must show youthe analyser printout.
In writingthe CO2 values measured against the manufacturer's tolerance.
Board replacement, only if needed
What they doIf gas pressure and electrodes are fine, the technician considers replacing the circuit board, the last step Baxi gives.
They must show youthe earlier checks that passed.
In writingthe part number of the board replaced and why.
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 or combustion smell
- Who:
- you.
- How:
- before resetting, notice whether there is a smell of gas or combustion fumes near the boiler, or whether anyone has a headache, dizziness or nausea.
- Result that matters:
- whether it is safe to carry on with the checks.
- If you smell gas:
- do not reset; follow the gas warning and call from outside.
- If you smell combustion fumes:
- switch the boiler off, open doors and windows and call the service centre, as Baxi asks.
- Evidence to keep:
- a note of the time and what you noticed.
Evidence: Baxi Neodens Plus 24/24 F ECO, 28/28 F ECO y 33/33 F ECO, instrucciones de funcionamiento y mantenimiento para el usuario 7731457
Yellow gas tap
- Who:
- you.
- How:
- check that the gas tap, yellow and located under the boiler, is open, as Baxi asks for start-up. Do not touch other valves, fittings or pipes.
- Result that matters:
- whether gas can reach the boiler.
- If it was closed:
- open it, make one reset and tell the technician if 134 returns.
- If it was open:
- the cause may be in the mains gas pressure, the electrodes or the board.
- Evidence to keep:
- photo of the tap.
Evidence: Baxi Neodens Plus 24/24 F ECO, 28/28 F ECO y 33/33 F ECO, instrucciones de funcionamiento y mantenimiento para el usuario 7731457
One reset with the off and reset key
- Who:
- you.
- How:
- for 134 Baxi says to press the off and reset key for at least 2 seconds. The boiler allows 5 resets in a row and then you must wait 15 minutes. Make just one.
- Result that matters:
- whether the burner lights and 134 clears.
- If it works:
- note the date and time; if 134 repeats often, Baxi says to call the service centre.
- If it returns straight away:
- do not use up the remaining resets; call the authorised service centre.
- Evidence to keep:
- photo of the display with 134 and a note of each reset.
Evidence: Baxi Neodens Plus 24/24 F ECO, 28/28 F ECO y 33/33 F ECO, instrucciones de funcionamiento y mantenimiento para el usuario 7731457
Secondary code in the information menu
- Who:
- you.
- How:
- press the information key for at least 1 second and look for line 00, secondary internal fault code; exit with the key shown in the manual.
- Result that matters:
- having the internal data that goes with 134.
- If a value appears:
- photograph it for the technician, it saves diagnosis time.
- If you cannot read it:
- do not change any parameter; a photo of 134 is enough.
- Evidence to keep:
- photo of menu line 00.
Evidence: Baxi Neodens Plus 24/24 F ECO, 28/28 F ECO y 33/33 F ECO, instrucciones de funcionamiento y mantenimiento para el usuario 7731457
Gas pressure, electrodes and board checked by the technician
- Who:
- Baxi authorised technical service.
- How:
- measures the gas supply pressure at the gas valve test point, checks the detection and ignition electrodes, their position and wiring, and only then the board.
- Result that matters:
- what stops the gas valve from working normally.
- If the gas pressure is wrong:
- the fault is in the supply, not in the boiler.
- If the pressure is right:
- the electrodes are checked and, if necessary, the board is replaced.
- Evidence to keep:
- job sheet with the pressure measured, what was checked and the parts replaced.
Baxi says to disconnect the power supply before any work. Gas valve, electrodes, burner and board are technician-only work.
Evidence: Baxi Neodens Plus 24/24 F ECO, 28/28 F ECO y 33/33 F ECO, instrucciones de instalación, montaje y funcionamiento para el instalador 7731458
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
- 134
- Baxi 134
- Baxi E 134
- Error 134 Baxi
- Neodens Plus 134
What it means
On the Neodens Plus ECO, code 134 is gas valve blocked and Baxi lets the user reset it by pressing the key for at least 2 seconds, with up to 5 resets in a row before a 15 minute wait. In the installer manual it says to check the gas supply pressure, the condition and position of the detection and ignition electrodes and their wiring, and only if necessary to replace the circuit board. The code does not say whether the gas supply, the electrodes or the board is at fault.
Warnings and stop conditions
- Criticaleditorial warning
If you smell gas: Baxi says to switch the boiler off, not to operate any electrical device or switch on lights, to put out any flame and open the windows. Then leave the home and call your gas distributor's emergency number and the service centre from outside.
Evidence: Baxi Neodens Plus 24/24 F ECO, 28/28 F ECO y 33/33 F ECO, instrucciones de funcionamiento y mantenimiento para el usuario 7731457
- Higheditorial warning
If you smell combustion fumes: Baxi says to switch the boiler off, air the room by opening doors and windows and call the service centre. Carbon monoxide has no smell; if anyone has a headache, dizziness or nausea, get outside and seek help. A CO alarm near the boiler gives early warning.
Evidence: Baxi Neodens Plus 24/24 F ECO, 28/28 F ECO y 33/33 F ECO, instrucciones de funcionamiento y mantenimiento para el usuario 7731457
- Highsource verified
Do not chain resets: after 5 attempts in a row the boiler stays locked for 15 minutes. If 134 appears often, Baxi says to contact the authorised technical service.
Evidence: Baxi Neodens Plus 24/24 F ECO, 28/28 F ECO y 33/33 F ECO, instrucciones de funcionamiento y mantenimiento para el usuario 7731457 · Baxi Neodens Plus 24/24 F ECO, 28/28 F ECO y 33/33 F ECO, instrucciones de instalación, montaje y funcionamiento para el instalador 7731458
Symptoms and causes
Probable causes · in order
- Gas supply pressurePossible
It is the first thing Baxi says to check for 134. If gas does not reach the boiler at the expected pressure, the valve cannot work and the boiler locks out.
Evidence: Baxi Neodens Plus 24/24 F ECO, 28/28 F ECO y 33/33 F ECO, instrucciones de instalación, montaje y funcionamiento para el instalador 7731458
- Detection or ignition electrodesPossible
Baxi says to check their condition, position and wiring. A damaged, displaced or badly connected electrode prevents ignition from being confirmed.
Evidence: Baxi Neodens Plus 24/24 F ECO, 28/28 F ECO y 33/33 F ECO, instrucciones de instalación, montaje y funcionamiento para el instalador 7731458
- Circuit boardPossible
Baxi leaves it until last: only if necessary, after ruling out gas pressure and the electrodes, is the board replaced.
Evidence: Baxi Neodens Plus 24/24 F ECO, 28/28 F ECO y 33/33 F ECO, instrucciones de instalación, montaje y funcionamiento para el instalador 7731458
Virtual technician
Does E134 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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