- Boilers
- Gas boiler
A09
Beretta A09 on a gas boiler: heat exchanger cleaning or flue sensor
Risk level
High
Professional inspection is recommended.
Urgency
Medium
Quick answer
Beretta A09 flags primary heat exchanger cleaning or a fault or overheating of the flue gas sensor. Reset once with the selector on OFF for 5 to 6 seconds; if it stays, call the technical service.
Safety first
Stop and check this first
- If you smell gas: Beretta says not to touch electrical switches, the phone or anything that sparks, to ventilate by opening doors and windows and to close the main gas tap. Then leave the home and call your gas distributor's emergency number from the street.
- Beretta warns that a badly closed flue pipe can leak carbon monoxide, which is dangerous for people and animals. If you smell combustion, switch off with the selector, ventilate and do not switch on again until the technical service has checked it.
Safe checks you can perform
- Whether the boiler keeps running
- One reset with the selector
- Combustion smell and flue terminal
- Cleaning and counter reset by the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Flue sensor check
- Do not attempt this professional task: Combustion analysis
- Do not attempt this professional task: Heat exchanger cleaning and counter
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.
Flue sensor check
What they doThe technician checks the flue sensor and its connection when the boiler stops or locks out with A09.
They must show youthe flue temperature read against the real one.
In writingthe sensor's condition and whether it was replaced.
Combustion analysis
What they doUsing the combustion analysis function, the technician measures CO2 and the flue gases at the test point and compares them with Beretta's table.
They must show youthe analyser printout.
In writingthe measured values and what was adjusted.
Heat exchanger cleaning and counter
What they doThe technician cleans the primary heat exchanger with the specific kit and resets the flue sensor hour counter.
They must show youthe counter reading before and after.
In writingthe cleaning done and the date.
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.
Whether the boiler keeps running
- Who:
- you.
- How:
- see whether heating and hot water keep working with A09 on the display.
- Result that matters:
- whether it is a reminder or a stop.
- If it keeps running:
- it is the cleaning reminder; book the technical service.
- If it stops or locks out:
- it is the flue sensor part; go on to the reset.
- Evidence to keep:
- a photo of the display and a note of what works.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso
One reset with the selector
- Who:
- you.
- How:
- turn the function selector to off (OFF), wait 5 to 6 seconds and turn it back to summer or winter, as Beretta describes for A09. Do it once.
- Result that matters:
- whether the boiler starts and the code stays away.
- If it starts and does not come back:
- note the date and time; if it repeats another day, tell the technical service.
- If A09 returns or the boiler does not start:
- do not keep trying; Beretta says to call the technical service.
- Evidence to keep:
- a photo of the display with the code and a note of each reset.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso
Combustion smell and flue terminal
- Who:
- you.
- How:
- notice any smell of burnt gases and look at the flue terminal from the ground, without touching it.
- Result that matters:
- whether there is a smell or the terminal is blocked.
- If there is a smell:
- switch off with the selector, ventilate and call the technical service.
- If there is no smell and the terminal is clear:
- wait for the technician without chaining resets.
- Evidence to keep:
- photos of the terminal and a note of the time.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso
Cleaning and counter reset by the technician
- Who:
- technician from the technical service.
- How:
- cleans the primary heat exchanger with the specific kit and resets the hour counter with the CO key, as Beretta describes.
- Result that matters:
- that A09 clears after cleaning.
- If it clears:
- the maintenance is done.
- If it comes back straight away:
- check the flue sensor and combustion.
- Evidence to keep:
- a report of the cleaning and the counter reading before and after.
Cleaning requires cutting power, removing the cover and touching the board: Beretta reserves it for qualified staff.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso
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
- Beretta
- Product type
- Gas boiler
Known code variants
- A-09
- A9
- Anomalía A09 Ferroli
- Beretta A 09
- Ciao Green A09
- Cointra A 09
- Error A09 Beretta
- Error A09 Cointra
- Error A09 Ferroli
- Ferroli A09
- Ferroli A09 boiler
- Ferroli A09 caldera
- Ferroli error A09
- Superlative A09
What it means
In the Ciao Green C.S.I. table, A09 covers three cases: primary heat exchanger cleaning (signal), flue NTC fault (temporary stop) and flue sensor overheating (permanent lockout). Beretta explains the boiler has a self-diagnosis that, based on hours under certain conditions, asks for heat exchanger cleaning when the flue sensor counter exceeds 2,500, and that the boiler keeps running with this alarm. After cleaning with the specific kit, the technician resets the counter.
Warnings and stop conditions
- Criticaleditorial warning
If you smell gas: Beretta says not to touch electrical switches, the phone or anything that sparks, to ventilate by opening doors and windows and to close the main gas tap. Then leave the home and call your gas distributor's emergency number from the street.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso
- Higheditorial warning
Beretta warns that a badly closed flue pipe can leak carbon monoxide, which is dangerous for people and animals. If you smell combustion, switch off with the selector, ventilate and do not switch on again until the technical service has checked it.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso
Symptoms and causes
Probable causes · in order
- Heat exchanger cleaning reminderCommon
If the boiler keeps heating with A09 on the display, it fits the flue counter reminder, which Beretta sets above 2,500.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso
- Flue NTC sensor faultyPossible
If the boiler stops and restarts by itself after a while, it fits the flue NTC fault.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso
- Flue gas overheatingPossible
If it stays in permanent lockout, the sensor measured flue gases that were too hot; the technician must find out why.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso
Virtual technician
Does A09 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
Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso
Beretta · 2015 · manual
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