- Boilers
- Gas boiler
2980
Junkers Bosch 2980 on a gas boiler: super lockout after resets
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
Junkers Bosch 2980 is a super lockout: the boiler has locked after several lockout faults were reset in a short time. Bosch says not to try to clear it and to call a qualified technician straight away. Until then there is no heating or hot water.
Safety first
Stop and check this first
- If you smell flue gas or suspect a carbon monoxide leak: Bosch says switch the boiler off, open doors and windows, warn the neighbours, leave the building and call the official service. CO has no colour, smell or taste: if you feel headache, dizziness or nausea, get into fresh air and call for help. Bosch recommends CO alarms.
- If you smell gas: Bosch says do not smoke or use lighters or matches, do not operate switches or pull plugs, do not use the phone or doorbell, close the gas supply at the main valve or meter, open doors and windows, warn the neighbours, leave the building and keep others out. From outside, call the fire brigade, the police and the gas company.
- Do not try to clear 2980 yourself: the user manual says to contact a qualified heating engineer straight away and warns that trying may cause a serious safety related fault. There will be no heating or hot water until it is repaired.
Safe checks you can perform
- Gas or flue gas smell near the boiler
- Do not reset again
- Codes shown before
- Diagnosis and unlock by the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Diagnosis of the original fault
- Do not attempt this professional task: Whole system check
- Do not attempt this professional task: Unlock and review of the last 10 faults
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.
Diagnosis of the original fault
What they doThe technician identifies which lockout fault repeated until it caused the super lockout.
They must show youthe original code in the history.
In writingthe cause found and the repair.
Whole system check
What they doChecks sensors and wiring harnesses across the whole system, not only the part behind the last fault.
They must show youwhat was checked.
In writingthe list of checks and their results.
Unlock and review of the last 10 faults
What they doAfter the repair, cycles the power, completes the unlock with the arrows and reviews the history.
They must show youthe history after the unlock.
In writingthat the boiler returned to normal operation and the test done.
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:
- leave the boiler as it is and go to the next step.
- Evidence to keep:
- the time and what you noticed.
Evidence: Bosch Condens 4300iW, instrucciones de uso de la caldera de condensación a gas (6720891218)
Do not reset again
- Who:
- you.
- How:
- leave the boiler as it is; the user manual says not to try to clear fault 2980.
- Result that matters:
- that nobody at home keeps pressing reset or switching off and on.
- If someone tries:
- Bosch warns it may cause a serious safety related fault.
- If the boiler stays off:
- that is expected until the technician arrives.
- Evidence to keep:
- who pressed reset, how many times and when.
Evidence: Bosch Condens 4300iW, instrucciones de uso de la caldera de condensación a gas (6720891218)
Codes shown before
- Who:
- you.
- How:
- remember or look in your photos for the code the display showed before 2980 and what the boiler was doing at the time.
- Result that matters:
- the earlier lockout code and how often it appeared.
- If you have it:
- give it to the technician with the appliance name and serial number from the rating plate, as the manual asks.
- If you do not:
- the technician will read it in the history of the last 10 faults.
- Evidence to keep:
- photos of the display and the rating plate.
Evidence: Bosch Condens 4300iW GC4300iW 24 P, instrucciones de mantenimiento y de instalación (6721835266) · Bosch Condens 4300iW, instrucciones de uso de la caldera de condensación a gas (6720891218)
Diagnosis and unlock by the technician
- Who:
- authorised technician.
- How:
- diagnoses the lockout fault, checks the whole system with sensors and harnesses, cycles the power and unlocks with the up and down arrows for 3 seconds, twice with a 22 second wait.
- Result that matters:
- that the boiler returns to normal operation.
- If 2981 appears:
- it is still in super lockout and the unlock is not finished.
- If the original fault is still in the history:
- it is not solved.
- Evidence to keep:
- a report with the original fault and the last 10 faults reviewed.
Bosch warns of a risk of injury if the fault is not removed and the whole system is not checked. Internal work is only for a qualified technician.
Evidence: Bosch Condens 4300iW GC4300iW 24 P, instrucciones de mantenimiento y de instalación (6721835266)
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
- Junkers
- Product type
- Gas boiler
Known code variants
- Bosch 2980
- Bosch Condens 2980
- Condens 4300iW 2980
- Error 2980 Junkers
- Junkers 2980
- Superbloqueo 2980
What it means
On the Bosch Condens 4300iW, 2980 appears when 5 lockout faults are reset within 15 minutes: the boiler treats this as a possible critical condition and goes into super lockout. Bosch warns that if the fault is not removed and the whole system is not checked, there is a risk of injury. The user manual tells the user not to try to clear it. After diagnosis and a power cycle the display shows 2981 until the technician completes the unlock with the arrow keys. The code does not say which fault lay underneath.
Warnings and stop conditions
- Higheditorial warning
If you smell flue gas or suspect a carbon monoxide leak: Bosch says switch the boiler off, open doors and windows, warn the neighbours, leave the building and call the official service. CO has no colour, smell or taste: if you feel headache, dizziness or nausea, get into fresh air and call for help. Bosch recommends CO alarms.
Evidence: Bosch Condens 4300iW, instrucciones de uso de la caldera de condensación a gas (6720891218)
- Criticalsource verified
If you smell gas: Bosch says do not smoke or use lighters or matches, do not operate switches or pull plugs, do not use the phone or doorbell, close the gas supply at the main valve or meter, open doors and windows, warn the neighbours, leave the building and keep others out. From outside, call the fire brigade, the police and the gas company.
Evidence: Bosch Condens 4300iW, instrucciones de uso de la caldera de condensación a gas (6720891218)
- Highsource verified
Do not try to clear 2980 yourself: the user manual says to contact a qualified heating engineer straight away and warns that trying may cause a serious safety related fault. There will be no heating or hot water until it is repaired.
Evidence: Bosch Condens 4300iW, instrucciones de uso de la caldera de condensación a gas (6720891218)
Symptoms and causes
Probable causes · in order
- A lockout fault that keeps returningCommon
2980 is not a fault in itself: it appears because another lockout fault has repeated. Bosch says to diagnose and fix that fault, checking the whole system including sensors and harnesses.
Evidence: Bosch Condens 4300iW GC4300iW 24 P, instrucciones de mantenimiento y de instalación (6721835266)
- Several resets in a rowCommon
The super lockout triggers when 5 lockout faults are reset within 15 minutes. Pressing reset again and again without finding the cause is what sets it off.
Evidence: Bosch Condens 4300iW GC4300iW 24 P, instrucciones de mantenimiento y de instalación (6721835266)
Virtual technician
Does 2980 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
Bosch Condens 4300iW GC4300iW 24 P, instrucciones de mantenimiento y de instalación (6721835266)
Bosch Termotecnia (Robert Bosch España) · 2021 · manual
- 2
Bosch Condens 4300iW, instrucciones de uso de la caldera de condensación a gas (6720891218)
Bosch Termotecnia (Robert Bosch España) · 2021 · manual
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