- Boilers
- Gas boiler
A11
Beretta A11 gas boiler: parasite flame temporary stop
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
Code A11 with the bell icon on Beretta Ciao Green and Mynute Green E boilers means a temporary stop from a false flame signal. Do not remove the casing: if it does not clear alone, try at most one reset as your manual describes (Mynute Green E: selector at OFF 5-6 seconds) and call an engineer.
Safety first
Stop and check this first
- Because code A11 indicates a false or parasite flame signal, do not keep resetting the boiler, and if a single reset as your boiler manual describes does not clear the fault, leave the appliance switched off, close the gas cock, and contact the Technical Assistance Centre.
- If you smell gas at any point, open windows wide right away, turn off the main gas tap if it is safe to do so, never operate light switches or electrical appliances, vacate the premises, and phone the gas emergency number from outside.
Safe checks you can perform
- Observe whether the A11 temporary stop clears automatically
- Perform at most one reset as your boiler manual describes
- Authorised inspection of flame electrode 16, 230 V L-N polarity, and gas valve
Leave these tasks to a qualified professional
- Do not attempt this professional task: Clean or replace the flame detection electrode (16 / E.D. / E.R.) and check condensate drainage
- Do not attempt this professional task: Verify 230 V 50 Hz L-N polarity, earthing, gas valve (24/31) seal, and AKL board
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.
Clean or replace the flame detection electrode (16 / E.D. / E.R.) and check condensate drainage
What they doInspect the flame detection electrode (component 16), its ceramic insulation, and lead wire to the PCB, and verify that condensate siphon (27 or 28) drains freely so water cannot bridge the electrode.
They must show youThe condition of flame detection electrode 16 and the zero microamp reading when the burner is off.
In writingMeasured ionisation current in standby and during flame, plus the part number if electrode 16 was replaced.
Verify 230 V 50 Hz L-N polarity, earthing, gas valve (24/31) seal, and AKL board
What they doMeasure phase-neutral polarity and earth loop impedance on the 230 V supply, test gas valve (24 or 31) shut-off tightness, and confirm that control board AKL drops the flame signal promptly on shutdown.
They must show youMultimeter readings confirming 230 V L-N polarity and gas pressure gauge verification of tight valve closure.
In writingConfirmation of correct L-N polarity, earth continuity, gas tightness test results, and AKL board status.
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.
Observe whether the A11 temporary stop clears automatically
- Who:
- you, no tools.
- How:
- Check whether A11 is shown alongside the bell icon (figure 34) indicating a temporary stop, and wait briefly without pressing buttons to see if the control board clears the alarm once the stray signal subsides.
- Result that matters:
- Code A11 disappears on its own and the boiler returns to normal standby or heating operation.
- If code A11 stays locked on the screen and the boiler remains stopped, move on to perform one single reset via the mode selector.
- If the code clears automatically but reappears on subsequent heating cycles, note how often it happens and book an authorised Beretta engineer.
- Evidence to keep:
- Clear photo of the display showing code A11 and the bell symbol.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso · Beretta Mynute Green E 25 C.S.I. y 30 C.S.I., manual para el instalador y usuario (EN/ES)
Perform at most one reset as your boiler manual describes
- Who:
- you, at the panel.
- How:
- Follow the reset procedure in your boiler's user manual. On the Mynute Green E the manual says to turn the mode selector to OFF, wait 5-6 seconds and turn it back to the desired summer or winter position, once only. On the Ciao Green, use the reset procedure in your own manual, also once only.
- Result that matters:
- Code A11 clears and the burner ignites normally without reporting a parasite flame again.
- If A11 returns after that single reset, do not repeat the reset, leave the selector on OFF, and call an authorised technician.
- If normal operation resumes, check on the water gauge that cold system pressure remains between 1 and 1.5 bar.
- Evidence to keep:
- Written note of the time of the single reset and whether A11 returned immediately.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso · Beretta Mynute Green E 25 C.S.I. y 30 C.S.I., manual para el instalador y usuario (EN/ES)
Authorised inspection of flame electrode 16, 230 V L-N polarity, and gas valve
- Who:
- Beretta engineer.
- How:
- The technician checks 230 V 50 Hz L-N polarity and earth continuity, inspects the flame detection electrode (16, E.D. or E.R.) and condensate siphon (27 or 28) for moisture bridging, tests gas valve (24 or 31 with OPE operator) shut-off tightness, and verifies the AKL control board.
- Result that matters:
- Zero residual ionisation current with the burner off, gas-tight valve closure, and verified L-N polarity and earthing.
- If live and neutral are reversed, condensate is backing up, or electrode 16 insulation is compromised, the engineer corrects the wiring, cleans the trap, or replaces the electrode.
- If the gas valve is passing gas when de-energised or board AKL registers false ionisation with the electrode disconnected, the faulty assembly is replaced with an official Beretta part.
- Evidence to keep:
- Service report recording standby ionisation current, 230 V polarity and earth test values, and gas valve tightness check.
Parasite flame alarms involve gas valve integrity and 230 V live circuits, so never open the boiler casing or touch internal components yourself.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso · Beretta Mynute Green E 25 C.S.I. y 30 C.S.I., manual para el instalador y usuario (EN/ES)
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 11
- Beretta A11
- Beretta boiler A11
- Beretta error A11
- caldera Beretta A11
- error A11 Beretta
What it means
According to the official Beretta documentation for Mynute Green E (25 and 30 C.S.I., in English and Spanish) and Ciao Green (25 and 29 C.S.I., in Spanish), code A11 with the bell icon (figure 34) means 'Parasite flame' ('Llama parásita' or 'Llama falsa') and causes a 'Temporary stop'. It indicates that control board AKL and the flame detection electrode (component 16, marked E.D. or E.R.) sense ionisation while the burner is off. Displaying A11 alone never proves a component has failed, because moisture on electrode 16, reversed L-N polarity on the 230 V 50 Hz supply, or a weeping gas valve (24 or 31) can all trigger it.
Warnings and stop conditions
- Highsource verified
Because code A11 indicates a false or parasite flame signal, do not keep resetting the boiler, and if a single reset as your boiler manual describes does not clear the fault, leave the appliance switched off, close the gas cock, and contact the Technical Assistance Centre.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso · Beretta Mynute Green E 25 C.S.I. y 30 C.S.I., manual para el instalador y usuario (EN/ES)
- Highsource verified
If you smell gas at any point, open windows wide right away, turn off the main gas tap if it is safe to do so, never operate light switches or electrical appliances, vacate the premises, and phone the gas emergency number from outside.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso · Beretta Mynute Green E 25 C.S.I. y 30 C.S.I., manual para el instalador y usuario (EN/ES)
Symptoms and causes
Probable causes · in order
- Moisture, contamination, or insulation leakage on flame detection electrode (16)Common
Condensation or combustion deposits on the ceramic insulator or lead of the flame detection electrode (item 16, labelled E.D. on Mynute Green E and E.R. on Ciao Green) can leak current to earth and mimic a flame when the burner is off.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso · Beretta Mynute Green E 25 C.S.I. y 30 C.S.I., manual para el instalador y usuario (EN/ES)
- Reversed L-N polarity or poor earthing on the 230 V 50 Hz mains supplyPossible
Beretta installation instructions require strict L-N polarity and an effective earth connection (with the earth wire a couple of centimetres longer) on the 230 V 50 Hz supply, as stray voltage on neutral disturbs ionisation sensing.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso · Beretta Mynute Green E 25 C.S.I. y 30 C.S.I., manual para el instalador y usuario (EN/ES)
- Incomplete shut-off of the gas valve (24 or 31) or control board (AKL) faultLess common
If the gas valve with operator OPE fails to seal completely after burner shutdown, or if the flame sensing circuit on control board AKL develops an internal fault, a real or simulated residual flame signal triggers A11.
Evidence: Beretta Ciao Green 25 y 29 C.S.I., manual de instalación y uso · Beretta Mynute Green E 25 C.S.I. y 30 C.S.I., manual para el instalador y usuario (EN/ES)
Virtual technician
Does A11 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
- 2
Beretta Mynute Green E 25 C.S.I. y 30 C.S.I., manual para el instalador y usuario (EN/ES)
Beretta · 2015 · manual
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