- Boilers
- Gas boiler
A80
Cointra A80 on a gas boiler: flame signal after valve closes
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
Cointra A80 means the boiler still sees a flame signal after the gas valve has closed. If you smell gas, leave the home. If not, press reset for one second, once; if A80 returns, leave it locked out and call the technician.
Safety first
Stop and check this first
- If you smell gas, do not reset or press anything electrical: open windows, close the gas tap if it is within reach, leave the home and call your gas distributor's emergency number from the street. Cointra says to switch a faulty boiler off and have it repaired only by an authorised technician.
- Cointra warns of a risk of asphyxia from escaping flue gases if the boiler runs with the siphon empty or the flue circuit is not sealed. Headache, dizziness or nausea can mean carbon monoxide: switch the boiler off, ventilate, leave and get help. Keep a CO alarm nearby.
- Do not keep pressing reset: the Superlative Supra table has its own lockout, A64, when the maximum number of consecutive resets is exceeded, and the power then has to be cut for 60 seconds. If A80 returns, leave it locked out.
Safe checks you can perform
- Gas or flue gas smell near the boiler
- When A80 appears
- A single reset with the reset key
- Electrode, gas valve and board by the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Gas valve check
- Do not attempt this professional task: Electrode and board check
- Do not attempt this professional task: Calibration and CO2 after a replacement
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 valve check
What they doThe technician checks the gas valve and confirms it shuts off the flow when closed, as Cointra asks for A80.
They must show youthe valve shut off test.
In writingthe result and, if replaced, the valve part reference.
Electrode and board check
What they doChecks the electrode position and condition and, if they are fine, checks the electronic board.
They must show youthe electrode checked.
In writingwhat was found and which part was replaced and why.
Calibration and CO2 after a replacement
What they doIf the board, electrode or valve is replaced, runs the full manual calibration and measures CO2 with an analyser against the Cointra table.
They must show youthe analyser printout.
In writingthe CO2 values measured against the manufacturer's specification.
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 flue gas smell near the boiler
- Who:
- you.
- How:
- walk up without pressing switches or turning lights on and notice whether there is a smell of gas or combustion fumes.
- Result that matters:
- whether there is a smell or not.
- If there is a smell:
- do not touch the boiler and follow the gas warning on this page.
- If there is no smell:
- go on to note the code.
- Evidence to keep:
- the time and what you noticed.
Evidence: Cointra SUPERLATIVE SUPRA C, instrucciones de uso, instalación y mantenimiento (cod. 3541V210)
When A80 appears
- Who:
- you.
- How:
- take a photo of the display and note whether it appeared when you finished using hot water or when the heating stopped.
- Result that matters:
- when it appears and whether it repeats.
- If it always appears when hot water or heating stops:
- tell the technician: that is exactly when the valve closes.
- If it appeared only once:
- go on to the single reset.
- Evidence to keep:
- a photo of the display, the date and time.
Evidence: Cointra SUPERLATIVE SUPRA C, instrucciones de uso, instalación y mantenimiento (cod. 3541V210)
A single reset with the reset key
- Who:
- you.
- How:
- only if there is no smell of gas, hold the reset key for one second, as Cointra describes for A faults. Once only.
- Result that matters:
- whether the boiler works again without A80.
- If it works:
- note the day and time; if A80 returns, the technician should check the electrode, valve and board.
- If it does not restart or A80 returns at once:
- Cointra says the fault must be fixed; leave it locked out and call.
- Evidence to keep:
- the reset result.
Evidence: Cointra SUPERLATIVE SUPRA C, instrucciones de uso, instalación y mantenimiento (cod. 3541V210)
Electrode, gas valve and board by the technician
- Who:
- authorised gas technician.
- How:
- checks the electrode position and condition, checks the gas valve and how it shuts, and checks the electronic board.
- Result that matters:
- whether there is a real flame after closing or a false signal.
- If the valve does not shut properly:
- it is replaced before the boiler is used again.
- If the valve and electrode are fine:
- the board becomes the suspect.
- Evidence to keep:
- a report with what was checked, parts replaced and the calibration done.
The gas valve, electrode and board are inside the casing. Cointra leaves repairs and part replacement to authorised technicians.
Evidence: Cointra SUPERLATIVE SUPRA C, instrucciones de uso, instalación y mantenimiento (cod. 3541V210)
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
- Cointra
- Product type
- Gas boiler
Known code variants
- A 80
- Cointra A 80
- Error A80 Cointra
- Superlative Supra A80
- Supra A80
What it means
In the Superlative Supra C fault table, A80 is a stray flame signal after the valve closes: the board still reads a flame when the gas valve should already have shut. Cointra gives three causes: an electrode problem, a gas valve problem or an electronic board problem. The letter A is a permanent lockout reset by holding the reset key for one second. The code does not say whether the flame is real, because the valve does not shut, or just a false signal.
Warnings and stop conditions
- Criticaleditorial warning
If you smell gas, do not reset or press anything electrical: open windows, close the gas tap if it is within reach, leave the home and call your gas distributor's emergency number from the street. Cointra says to switch a faulty boiler off and have it repaired only by an authorised technician.
Evidence: Cointra SUPERLATIVE SUPRA C, instrucciones de uso, instalación y mantenimiento (cod. 3541V210)
- Criticaleditorial warning
Cointra warns of a risk of asphyxia from escaping flue gases if the boiler runs with the siphon empty or the flue circuit is not sealed. Headache, dizziness or nausea can mean carbon monoxide: switch the boiler off, ventilate, leave and get help. Keep a CO alarm nearby.
Evidence: Cointra SUPERLATIVE SUPRA C, instrucciones de uso, instalación y mantenimiento (cod. 3541V210)
- Highsource verified
Do not keep pressing reset: the Superlative Supra table has its own lockout, A64, when the maximum number of consecutive resets is exceeded, and the power then has to be cut for 60 seconds. If A80 returns, leave it locked out.
Evidence: Cointra SUPERLATIVE SUPRA C, instrucciones de uso, instalación y mantenimiento (cod. 3541V210)
Symptoms and causes
Probable causes · in order
- Electrode problemPossible
Cointra says to check the electrode position and condition. This is the cause when there is no flame and the electrode gives a false signal.
Evidence: Cointra SUPERLATIVE SUPRA C, instrucciones de uso, instalación y mantenimiento (cod. 3541V210)
- Gas valve problemPossible
Cointra says to check the gas valve and replace it if needed. This is the most serious cause: the flame would be real because the valve does not fully shut.
Evidence: Cointra SUPERLATIVE SUPRA C, instrucciones de uso, instalación y mantenimiento (cod. 3541V210)
- Electronic board problemPossible
Cointra lists the electronic board and says to check it. It comes into play when the electrode and valve are fine and A80 keeps appearing.
Evidence: Cointra SUPERLATIVE SUPRA C, instrucciones de uso, instalación y mantenimiento (cod. 3541V210)
Virtual technician
Does A80 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
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