- Boilers
- Gas boiler
89
Immergas 89 on a gas boiler: unstable combustion signal
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
Immergas 89 means the flame is unstable, although the boiler keeps running. It only shows in the information menu list. Check from outside that the flue terminal is not covered and tell the technician if it repeats.
Safety first
Stop and check this first
- If you smell gas: Immergas says to close the meter or main gas tap and, if you can, the boiler's gas tap, open doors and windows, use no naked flames, do not smoke and do not touch switches, sockets, doorbells or phones. Leave the home and call your gas distributor's emergency number from the street.
- If you get a headache, dizziness or nausea while the boiler runs, there may be carbon monoxide: switch it off, ventilate, leave the home and call the emergency services. A CO alarm near the boiler warns you before symptoms start.
Safe checks you can perform
- Code in the information menu list
- Gas tap and other gas appliances
- Flue terminal seen from outside
- Combustion, gas and ducts check by the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Flue gas recirculation
- Do not attempt this professional task: Dynamic gas pressure
- Do not attempt this professional task: Combustion analysis
- Do not attempt this professional task: Fan speed
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 gas recirculation
What they doThrough the analysis points, with the boiler at maximum output, the technician checks that the CO2 measured in the intake air is below 10% of that measured in the flue gases, as Immergas asks.
They must show youboth CO2 values.
In writingthe ratio measured and the correction if it fails.
Dynamic gas pressure
What they doThe technician measures the dynamic gas supply pressure with the boiler running. Immergas asks for it to comply with EN 437, because insufficient pressure affects output, and says the appliance must not be started if pressures are higher than needed.
They must show youthe pressure measured against the manufacturer's specification.
In writingthe value measured and, if it fails, who was notified.
Combustion analysis
What they doUsing the chimney sweep function, the technician measures CO2 at the three reference outputs and CO. Immergas sets a maximum CO below 700 ppm at the annual check and below 500 ppm after a repair.
They must show youthe analyser printout.
In writingthe CO2 and CO values measured against the manufacturer's.
Fan speed
What they doThe technician reads fan speed (d 1.3) and the combustion signal (d 0.1) in the information menu with the boiler running and checks whether they are stable.
They must show youthe fan speed and combustion signal readings.
In writingwhat was observed and any part replaced, with its reference and reason.
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.
Code in the information menu list
- Who:
- you.
- How:
- E89 does not show on the normal display; Immergas states it can only be seen in the fault list of the information menu. Press the information button for at least 1 second and step to d 0.8, which shows the last five faults.
- Result that matters:
- whether E89 is on the list and how often.
- If it appears several times:
- tell the technician and note the weather, especially if it was windy.
- If it appears once:
- note the date and time and check the list again in a few days.
- Evidence to keep:
- a photo of the fault list.
Evidence: Immergas Victrix Zeus 25/32, instrucciones y advertencias para instalador, usuario y mantenimiento (1.042022SPA)
Gas tap and other gas appliances
- Who:
- you.
- How:
- check under the boiler that the gas tap is fully open and, if you have another gas appliance, whether it works normally.
- Result that matters:
- whether gas is arriving normally.
- If the tap was half open:
- open it fully and tell the technician.
- If another gas appliance also works badly:
- contact your gas distributor; a supply pressure problem fits.
- Evidence to keep:
- a note of the tap position and how the other appliances work.
Evidence: Immergas Victrix Zeus 25/32, instrucciones y advertencias para instalador, usuario y mantenimiento (1.042022SPA)
Flue terminal seen from outside
- Who:
- you.
- How:
- from the street, the yard or the ground, without climbing ladders or onto the roof, look at the air intake and flue terminal. Immergas asks you to check it is not blocked.
- Result that matters:
- whether something covers the intake or the outlet.
- If it is covered:
- do not dismantle or tamper with the ducts; tell the technician.
- If it is clear:
- rule out a visible blockage; the technician checks whether flue gases are drawn back into the intake.
- Evidence to keep:
- a photo of the terminal.
Evidence: Immergas Victrix Zeus 25/32, instrucciones y advertencias para instalador, usuario y mantenimiento (1.042022SPA)
Combustion, gas and ducts check by the technician
- Who:
- technician from an authorised company.
- How:
- checks for flue gas recirculation, measures the dynamic gas pressure, analyses combustion and reviews fan speed.
- Result that matters:
- which Immergas cause makes the flame unstable.
- If flue gases recirculate or the gas is out of specification:
- it is corrected before going further.
- If everything is in specification and E89 continues:
- the fan and combustion control are checked.
- Evidence to keep:
- a job sheet with the values measured.
Gas, fan, ducts and combustion are work for an authorised company; Immergas tells the user not to open or tamper with the appliance or the ducts.
Evidence: Immergas Victrix Zeus 25/32, instrucciones y advertencias para instalador, usuario y mantenimiento (1.042022SPA)
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
- Immergas
- Product type
- Gas boiler
Known code variants
- E89
- Error 89 Immergas
- Immergas E89
- Victrix 89
- Victrix E89
What it means
In the Victrix Zeus 25/32 table, E89 is unstable combustion signal: the flame is unstable because of flue gas recirculation, wind, unstable gas pressure, unstable fan speed or a system malfunction. The appliance keeps running and the fault only shows in the fault list of the information menu. If it persists, Immergas says to call an authorised company. The code does not say which cause applies; combustion, gas and ducts are checked by the technician.
Warnings and stop conditions
- Criticaleditorial warning
If you smell gas: Immergas says to close the meter or main gas tap and, if you can, the boiler's gas tap, open doors and windows, use no naked flames, do not smoke and do not touch switches, sockets, doorbells or phones. Leave the home and call your gas distributor's emergency number from the street.
Evidence: Immergas Victrix Zeus 25/32, instrucciones y advertencias para instalador, usuario y mantenimiento (1.042022SPA)
- Criticaleditorial warning
If you get a headache, dizziness or nausea while the boiler runs, there may be carbon monoxide: switch it off, ventilate, leave the home and call the emergency services. A CO alarm near the boiler warns you before symptoms start.
Evidence: Immergas Victrix Zeus 25/32, instrucciones y advertencias para instalador, usuario y mantenimiento (1.042022SPA)
Symptoms and causes
Probable causes · in order
- Flue gas recirculationPossible
Fits if flue gases are being drawn back into the air intake. Immergas lists it as a cause of unstable flame; it is confirmed by measuring CO2 in the intake air.
Evidence: Immergas Victrix Zeus 25/32, instrucciones y advertencias para instalador, usuario y mantenimiento (1.042022SPA)
- WindPossible
Fits if E89 builds up in the list on very windy days and not on calm ones. Immergas lists wind among the causes of unstable flame.
Evidence: Immergas Victrix Zeus 25/32, instrucciones y advertencias para instalador, usuario y mantenimiento (1.042022SPA)
- Unstable gas pressurePossible
Fits if other gas appliances also work irregularly. Immergas lists unstable gas pressure; the technician measures the dynamic supply pressure.
Evidence: Immergas Victrix Zeus 25/32, instrucciones y advertencias para instalador, usuario y mantenimiento (1.042022SPA)
- Fan or system malfunctionPossible
Fits if gas, ducts and wind are ruled out. Immergas lists unstable fan speed or a system malfunction.
Evidence: Immergas Victrix Zeus 25/32, instrucciones y advertencias para instalador, usuario y mantenimiento (1.042022SPA)
Virtual technician
Does 89 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
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