- Boilers
- Gas boiler
601
Chaffoteaux 601 on a gas boiler: flue sensor tripped
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
Chaffoteaux 601 means the flue sensor has tripped because of a flue gas evacuation fault (CF models). The boiler retries after 12 minutes. If it repeats, switch it off, close the gas and call the service centre; if you smell fumes, ventilate and leave.
Safety first
Stop and check this first
- If you smell gas: Chaffoteaux says to close the main gas tap, open the windows and call the technician. Do not operate switches or light flames, leave the home and call your gas distributor's emergency number from outside. If you smell burning or see smoke, cut the power, close the gas and ventilate.
- 601 points to a flue gas evacuation problem on CF models. If you notice a fumes smell, headache, dizziness or nausea, switch the boiler off, ventilate, leave and get help. Do not use it again until a technician has checked it.
Safe checks you can perform
- Fumes smell and symptoms
- Retry after 12 minutes
- Visible chimney outlet
- Flue check by the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Draught and spillage test
- Do not attempt this professional task: Room CO reading and combustion analysis
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.
Draught and spillage test
What they doThe technician measures the chimney draught and checks there is no flue gas spillage with the boiler running.
They must show youthe draught reading and the spillage test.
In writingthe cause found and the repair.
Room CO reading and combustion analysis
What they doThe technician measures CO in the room and the boiler's combustion with an analyser.
They must show youthe analyser printout.
In writingthe CO values measured.
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.
Fumes smell and symptoms
- Who:
- you.
- How:
- notice whether it smells of burnt gases near the boiler and whether anyone has a headache, dizziness or nausea.
- Result that matters:
- whether fumes may be inside the home.
- If there is a smell or symptoms:
- switch the boiler off, close the gas, ventilate, leave and get help.
- If there is no smell or symptoms:
- watch the retry.
- Evidence to keep:
- a note of the time and any symptoms.
Evidence: Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
Retry after 12 minutes
- Who:
- you.
- How:
- do not reset: Chaffoteaux says the boiler starts ignition by itself after 12 minutes.
- Result that matters:
- whether the boiler runs again or locks out again.
- If it runs and does not repeat:
- note the date and mention it at the service.
- If it locks out again or keeps repeating:
- switch the boiler off, disconnect it at the external switch, close the gas and call the service centre.
- Evidence to keep:
- photos of the display with 601 and the times.
Evidence: Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
Visible chimney outlet
- Who:
- you.
- How:
- look at the flue outlet from the ground or a window, without climbing onto roofs or touching anything.
- Result that matters:
- whether something is covering the outlet.
- If you see a blockage:
- tell the technician.
- If it is clear:
- the problem may be in the duct or the draught; the technician checks it.
- Evidence to keep:
- photos of the outlet.
Evidence: Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
Flue check by the technician
- Who:
- authorised gas technician.
- How:
- checks the chimney, duct and draught, and establishes the cause of the fault.
- Result that matters:
- where evacuation fails.
- If a blockage or damage is found:
- it is repaired and evacuation tested.
- If evacuation is fine:
- the boiler's flue control is checked.
- Evidence to keep:
- a report with the cause found and the repair.
Chaffoteaux reserves repairs for its technical service or a qualified technician: opening the boiler is not the user's job.
Evidence: Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
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
- Chaffoteaux
- Product type
- Gas boiler
Known code variants
- 6 01
- Ariston 6 01
- Ariston E601
- Chaffoteaux 6 01
- Error 601 Ariston
- Error 601 Chaffoteaux
- Pigma 601
What it means
On the Pigma Advance, 601 is the flue sensor tripping on CF models. Chaffoteaux explains that this control locks the boiler out if there is a fault in flue gas evacuation. The lockout is temporary: after 12 minutes the boiler starts ignition again; if conditions are normal it keeps running and if not it locks out and the cycle repeats. The code says evacuation failed, not why.
Warnings and stop conditions
- Criticaleditorial warning
If you smell gas: Chaffoteaux says to close the main gas tap, open the windows and call the technician. Do not operate switches or light flames, leave the home and call your gas distributor's emergency number from outside. If you smell burning or see smoke, cut the power, close the gas and ventilate.
Evidence: Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
- Criticaleditorial warning
601 points to a flue gas evacuation problem on CF models. If you notice a fumes smell, headache, dizziness or nausea, switch the boiler off, ventilate, leave and get help. Do not use it again until a technician has checked it.
Evidence: Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
Symptoms and causes
Probable causes · in order
- Flue gas evacuation faultCommon
Chaffoteaux asks the technician to fix the flue evacuation fault and establish its causes. It fits with blocked or damaged chimneys or poor draught.
Evidence: Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
- One off condition that clearsPossible
If after 12 minutes the boiler runs again and it does not repeat, the fault was passing; if it repeats, it is no longer a one off.
Evidence: Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
Virtual technician
Does 601 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
Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
Chaffoteaux · 2018 · manual
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