- Boilers
- Gas boiler
A01
Ferroli A01 on a gas boiler: no burner ignition
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
The boiler tried to light the burner, failed and locked out. Check that the gas cock ahead of the boiler is open and do one reset with RESET. If A01 returns, call the service centre.
Safety first
Stop and check this first
- If you smell gas: do not switch lights or appliances on or off, do not use flames or a phone indoors, open doors and windows if you can on your way out, leave the home and call your gas supplier's emergency number or the emergency services from outside.
- Do not open the casing to look at the burner or electrode. Ferroli says that in case of a fault you should deactivate the unit, not try to repair it yourself and contact professionally qualified personnel.
Safe checks you can perform
- Your exact Ferroli boiler model
- Gas cock ahead of the boiler
- One reset with the RESET button
- Inspection by a qualified gas technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Measure the mains gas pressure
- Do not attempt this professional task: Inspect the electrode and its wiring
- Do not attempt this professional task: Check siphon, ducts, gas valve and ignition power
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.
Measure the mains gas pressure
What they doThe technician measures the gas pressure reaching the boiler with a gauge and checks that air has been eliminated from the pipes.
They must show youthe measured pressure against the value in your model's manual.
In writingthe measured value and whether the line was purged.
Inspect the electrode and its wiring
What they doWith the power disconnected and the gas closed, the technician checks the position, connection and deposits of the ignition and detection electrode.
They must show youa photo of the electrode.
In writingwhether it was cleaned or replaced and why.
Check siphon, ducts, gas valve and ignition power
What they doOn the BlueHelix models the technician checks and cleans the siphon and the air and flue ducts; then checks the gas valve and, on the DIVAtop, the ignition power setting.
They must show youseveral successful ignitions after the repair.
In writingthe cause found and the part number replaced.
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.
Your exact Ferroli boiler model
- Who:
- you.
- How:
- find the model name on the front or on the rating plate, without opening the casing, and compare it with your boiler's manual.
- Result that matters:
- confirming what A01 means on your model.
- If it is a DIVAtop MICRO LN F, BlueHelix HiTech RRT C or BLUEHELIX TECH RRT 28 C:
- A01 means no burner ignition.
- If it is another model:
- check the fault table in its manual before following this page.
- Evidence to keep:
- photo of the rating plate and of the code.
Evidence: Ferroli DIVAtop MICRO LN F instrucciones de uso instalación y mantenimiento · Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
Gas cock ahead of the boiler
- Who:
- you.
- How:
- find the gas cock ahead of the boiler, the one Ferroli says to open when lighting it, and look at its position without touching anything inside the appliance.
- Result that matters:
- whether it is open.
- If it was closed and you do not smell gas:
- open it and do one reset.
- If it was open:
- continue with the next check; lack of gas is not ruled out yet.
- Evidence to keep:
- photo of the cock position.
Evidence: Ferroli DIVAtop MICRO LN F instrucciones de uso instalación y mantenimiento · Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento
One reset with the RESET button
- Who:
- you.
- How:
- press the RESET button on the panel for 1 second. Ferroli says faults marked with the letter A cause a permanent shutdown that is cleared this way, and that if the boiler fails to start the fault must be eliminated first.
- Result that matters:
- whether A01 comes back.
- If the boiler starts and runs:
- note the date; if A01 returns another day, the technician must know it was reset before.
- If A01 returns:
- do not keep resetting; call the service centre.
- Evidence to keep:
- photo of the code before and after the reset.
Evidence: Ferroli DIVAtop MICRO LN F instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
Inspection by a qualified gas technician
- Who:
- a qualified gas technician, preferably from Ferroli's service network.
- How:
- measures the mains gas pressure and checks the ignition and detection electrode, the gas valve, the ignition power setting on the DIVAtop and, on the BlueHelix models, the siphon and the air and flue ducts.
- Result that matters:
- which branch of Ferroli's fault table is confirmed by measurements.
- If the cause is found:
- they should explain which measurement confirms it before replacing parts.
- If everything measures correctly and the code returns:
- they should move to the next cause in the table, not replace parts at random.
- Evidence to keep:
- job sheet with the measurements and parts replaced.
Opening the casing or touching the gas valve, electrode, burner or flue is work for the technician only. Ferroli says to disconnect the electrical power supply and close the gas cock upstream before any operation inside the boiler.
Evidence: Ferroli DIVAtop MICRO LN F instrucciones de uso instalación y mantenimiento · Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
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
- Ferroli
- Product type
- Gas boiler
Known code variants
- A-01
- aerotermia Toshiba A01
- Alhena Tech C A01
- Anomalía A01 Ferroli
- Beretta A 01
- bomba de calor Toshiba A01 bomba
- caldera Lamborghini A01
- Ciao Green A01
- Cointra A 01
- Error A01 Beretta
- Error A01 Cointra
- error A01 Estia
- Error A01 Ferroli
- Estia error A01
- Estia R32 A01 caudal de agua
- Estia R32 A01 water flow
- Ferroli A01
- Ferroli A01 boiler
- Ferroli A01 caldera
- Ferroli error A01
- Lamborghini A01
- Lamborghini boiler A01
- Lamborghini Caloreclima A01
- Lamborghini el quemador no se enciende
- Lamborghini no burner ignition
- Superlative A01
- Toshiba air to water A01 pump
- Toshiba Estia A01
- Toshiba heat pump A01
- Toshiba HWT A01
What it means
On the DIVAtop MICRO LN F, BlueHelix HiTech RRT C and BLUEHELIX TECH RRT 28 C boilers, Ferroli defines A01 as no burner ignition. Possible causes are no gas or air in the pipes, the ignition or detection electrode, the gas valve, low gas pressure and, on the BlueHelix condensing models, a blocked siphon or blocked air and flue ducts. As an A code it locks the boiler out. It does not point to a specific part.
Warnings and stop conditions
- Criticaleditorial warning
If you smell gas: do not switch lights or appliances on or off, do not use flames or a phone indoors, open doors and windows if you can on your way out, leave the home and call your gas supplier's emergency number or the emergency services from outside.
Evidence: Ferroli DIVAtop MICRO LN F instrucciones de uso instalación y mantenimiento
- Highsource verified
Do not open the casing to look at the burner or electrode. Ferroli says that in case of a fault you should deactivate the unit, not try to repair it yourself and contact professionally qualified personnel.
Evidence: Ferroli DIVAtop MICRO LN F instrucciones de uso instalación y mantenimiento
Symptoms and causes
Probable causes · in order
- No gas or air in the pipesPossible
First cause in Ferroli's tables. It fits if the gas cock was closed, there was work on the gas installation or a supply cut.
Evidence: Ferroli DIVAtop MICRO LN F instrucciones de uso instalación y mantenimiento · Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
- Ignition or detection electrodePossible
Badly positioned, disconnected or with deposits. Only the technician checks it with the casing open.
Evidence: Ferroli DIVAtop MICRO LN F instrucciones de uso instalación y mantenimiento · Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
- Low gas pressure or gas valvePossible
Ferroli says to check the gas valve and, on the BlueHelix models, the mains gas pressure. It needs a gauge and a gas technician.
Evidence: Ferroli DIVAtop MICRO LN F instrucciones de uso instalación y mantenimiento · Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
- Blocked siphon or flues (BlueHelix)Possible
On the BlueHelix condensing models, a blocked condensate siphon or a blocked air or flue duct also cause A01.
Evidence: Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento · Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
Virtual technician
Does A01 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
- 1
Ferroli DIVAtop MICRO LN F instrucciones de uso instalación y mantenimiento
Ferroli · 2015 · manual
- 2
Ferroli BlueHelix HiTech RRT C instrucciones de uso instalación y mantenimiento
Ferroli · 2021 · manual
- 3
Ferroli BLUEHELIX TECH RRT 28 C instrucciones de uso instalación y mantenimiento
Ferroli · 2018 · manual
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