- Boilers
- Gas boiler
142
Immergas 142 on a gas boiler: Dominus offline or not connected
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
Immergas 142 means the Dominus, the accessory that links the boiler to the Dominus app, is disconnected, unpowered or not communicating with the boiler. Check that it is properly connected and powered.
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.
- While 142 lasts, do not rely on the app to switch the heating on or off: use the boiler panel. If you are going away, leave the programme checked there.
Safe checks you can perform
- Dominus icon on the display
- Visible power and connection of the Dominus
- Fault log
- Dominus and board check by the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Replacing the Dominus or the board
- Do not attempt this professional task: Dominus connection and power
- Do not attempt this professional task: Modbus communication parameter
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.
Replacing the Dominus or the board
What they doIf connection and power are fine, replaces the Dominus or the display board, as Immergas states.
They must show youwhich part is faulty and how they checked it.
In writingthe part replaced and why.
Dominus connection and power
What they doChecks that the Dominus is properly connected to the boiler and powered, as Immergas asks for 142.
They must show youthe Dominus connected and the icon on the display.
In writingwhat was found.
Modbus communication parameter
What they doChecks in the service menu, Modbus section, that communication is set to Dominus and not to Off or BMS.
They must show youthe parameter value.
In writingthe final setting.
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.
Dominus icon on the display
- Who:
- you.
- How:
- look at the boiler main screen. Immergas shows a connection icon for the Dominus remote management system there.
- Result that matters:
- whether the icon appears and whether 142 shows with it.
- If the icon is missing:
- the boiler does not see the Dominus; go to the next check.
- If it appears and 142 shows only now and then:
- note when; it points to communication dropouts.
- Evidence to keep:
- a photo of the display.
Evidence: Immergas Victrix Superior 26-35, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047096SPA)
Visible power and connection of the Dominus
- Who:
- you, only what you can see without opening anything.
- How:
- check whether there was a power cut in the home and look, without removing anything, that the Dominus and its visible cable are in place. Do not open the boiler or touch its terminals.
- Result that matters:
- whether the Dominus may be unpowered or disconnected.
- If there was a power cut or something was loose outside:
- wait for power to return and see whether the alarm clears.
- If everything looks in place and 142 stays:
- tell the technician.
- Evidence to keep:
- a photo of the Dominus and its cable.
Evidence: Immergas Victrix Superior 26-35, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047096SPA)
Fault log
- Who:
- you.
- How:
- go to MENU, Fault log, Boiler. Immergas stores the last 10 faults with date and time.
- Result that matters:
- whether 142 repeats and at what times.
- If it matches power cuts:
- the power supply is the suspect.
- If it appears with everything powered:
- communication or a Dominus fault remains.
- Evidence to keep:
- a photo of the log.
Evidence: Immergas Victrix Superior 26-35, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047096SPA)
Dominus and board check by the technician
- Who:
- technician from an authorised company.
- How:
- with the boiler isolated, checks the Dominus connection to the boiler, its power supply and the parameter that enables communication with the Dominus app.
- Result that matters:
- whether the Dominus is properly connected, powered and enabled.
- If the connection is at fault:
- corrects it and checks that the alarm clears.
- If all is fine and 142 stays:
- Immergas says to replace the Dominus or the display board.
- Evidence to keep:
- a job sheet with what was checked and any parts replaced.
Immergas tells the user not to open or tamper with the appliance. The Dominus connects inside the boiler, near 230 V connections.
Evidence: Immergas Victrix Superior 26-35, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047096SPA)
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
- Dominus offline
- E142
- Error 142 Immergas
- Immergas E142
- Victrix Superior 142
What it means
On the Victrix Superior 26-35, code 142 is the Dominus offline alarm. The Dominus is an optional accessory that lets you control the boiler with the Dominus app. Immergas gives two situations: the Dominus is disconnected or not powered, or there is no communication between the Dominus and the boiler. It asks for a check that it is properly connected and powered and, if that is not enough, replacement of the Dominus or the display board. If it persists, call an authorised company. The table does not say the boiler locks out with this code.
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 Superior 26-35, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047096SPA)
- Mediumeditorial warning
While 142 lasts, do not rely on the app to switch the heating on or off: use the boiler panel. If you are going away, leave the programme checked there.
Evidence: Immergas Victrix Superior 26-35, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047096SPA)
Symptoms and causes
Probable causes · in order
- Dominus disconnected or unpoweredCommon
Fits if there was a power cut or something near the boiler was unplugged. Immergas first names the Dominus being disconnected or not powered.
Evidence: Immergas Victrix Superior 26-35, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047096SPA)
- No communication with the boilerPossible
Fits if the Dominus has power but 142 stays. Immergas names lack of communication between the Dominus and the boiler as the second situation.
Evidence: Immergas Victrix Superior 26-35, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047096SPA)
- Faulty Dominus or display boardLess common
If connection and power are fine, Immergas says to replace the Dominus or the display board. This is technician work.
Evidence: Immergas Victrix Superior 26-35, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047096SPA)
Virtual technician
Does 142 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
Immergas (Immerspagna) · 2026 · manual
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