- Boilers
- Gas boiler
31
Immergas 31 on a gas boiler: no communication with the remote
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
Immergas 31 means the boiler has lost communication with the remote control. Unplug the boiler and plug it back in, as Immergas says; if it still does not detect the remote, the boiler runs from its own panel.
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 the boiler does not detect the remote, the Victrix Omnia V2 stays in summer mode and gives no heating. If the home is cold and there are elderly people or babies, call the technician promptly.
Safe checks you can perform
- Switching the power off and on
- Boiler mode and remote message
- Recent changes to the remote or thermostat
- Remote terminals and wiring check by the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Terminal connection
- Do not attempt this professional task: Remote compatibility
- Do not attempt this professional task: Separate line for the remote
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.
Terminal connection
What they doChecks that the remote is connected to terminals 41 and 44/40 with the X40 jumper removed, as Immergas specifies for the CARV2.
They must show youthe terminals checked.
In writingwhat was found and corrected.
Remote compatibility
What they doConfirms that only one remote control is connected and that it is compatible with the boiler; an On/Off thermostat must have a clean, volt-free contact.
They must show youthe remote model connected.
In writingwhether the remote is compatible.
Separate line for the remote
What they doChecks that the remote cable runs on a separate line, as Immergas requires when a remote or programmable thermostat is used.
They must show youthe cable route.
In writingwhether the installation complies.
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.
Switching the power off and on
- Who:
- you.
- How:
- switch the boiler off at the external main switch or unplug it, then restore the power, as Immergas says for 31.
- Result that matters:
- whether the boiler detects the remote after restarting.
- If the remote works again:
- note the time; it was a one-off dropout.
- If the boiler does not detect the remote:
- it runs from its panel; go to the next check.
- Evidence to keep:
- a photo of the display before and after.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA) · Immergas Victrix Superior 26-35, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047096SPA)
Boiler mode and remote message
- Who:
- you.
- How:
- look at the boiler display and the CARV2 display. Immergas says that if the boiler is put into off mode, the CARV2 shows the connection error ERR>CM.
- Result that matters:
- whether the boiler was in off mode or there really is a communication fault.
- If the boiler was off:
- switch it on with its button and see whether the remote comes back.
- If the boiler is on and shows 31:
- the communication fault remains; tell the technician.
- Evidence to keep:
- a photo of both displays.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA)
Recent changes to the remote or thermostat
- Who:
- you.
- How:
- think whether a remote, thermostat or programmable thermostat was recently changed or added, and note its make and model without removing it.
- Result that matters:
- whether there is more than one remote or one that may not be compatible.
- If something was changed recently:
- tell the technician; Immergas allows only one remote control.
- If nothing has changed:
- a communication dropout or the terminals become more likely.
- Evidence to keep:
- a photo of the remote and its label.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA)
Remote terminals and wiring check by the technician
- Who:
- technician from an authorised company.
- How:
- with the boiler isolated, checks the remote connection at terminals 41 and 44/40, the X40 jumper and the wiring to the remote.
- Result that matters:
- whether the connection is correct and the remote is compatible.
- If a terminal is loose or wrongly connected:
- corrects it and tests the communication.
- If the connection is fine:
- checks the remote itself against its manual.
- Evidence to keep:
- a job sheet with what was checked and the test result.
Immergas says to cut the power before touching the remote connections and tells the user not to open or tamper with the appliance.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA) · 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
- E31
- Error 31 Immergas
- Immergas E31
- Victrix 31
- Victrix E31
What it means
Code 31 is loss of communication with the remote control. Immergas puts it down to an incompatible remote control, communication problems or dropouts between boiler and remote and, on the Victrix Superior 26-35, also a connection error at the terminals. It says to cut the power and restore it. If the remote is not detected on restart, the Victrix Omnia V2 goes into summer mode and heating cannot be switched on; the Victrix Superior switches to local operation using its own panel.
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 Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA)
- Mediumeditorial warning
If the boiler does not detect the remote, the Victrix Omnia V2 stays in summer mode and gives no heating. If the home is cold and there are elderly people or babies, call the technician promptly.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA)
Symptoms and causes
Probable causes · in order
- Incompatible remote controlCommon
Fits if 31 began when a thermostat or remote was changed or added. Immergas names connection to an incompatible remote and allows only one remote control on the boiler.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA) · Immergas Victrix Superior 26-35, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047096SPA)
- Communication dropout with the remotePossible
Fits if the remote used to work and 31 appears now and then. The CARV2 remote is powered through the same two wires that carry data between boiler and remote.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA) · Immergas Victrix Superior 26-35, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047096SPA)
- Connection error at the terminalsPossible
On the Victrix Superior 26-35, Immergas also names a connection error at the terminals. Fits if 31 appears after an installation or electrical work on the boiler.
Evidence: Immergas Victrix Superior 26-35, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047096SPA)
Virtual technician
Does 31 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
- 2
Immergas (Immerspagna) · 2026 · manual
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