- Boilers
- Gas boiler
51
Immergas 51 on a gas boiler: no link with the CAR Wireless remote
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
Immergas 51 means the boiler has lost communication with the CAR remote control in its Wireless version. From then on it can only be controlled from the boiler panel. Check that the remote works and that its batteries are charged.
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 51 lasts, the remote programme does not control the boiler: Immergas says it can only be controlled from its panel. Set the temperature there so you are not left cold or overheating the home.
Safe checks you can perform
- Control from the boiler panel
- CAR Wireless batteries
- Remote operation
- Remote and link check by the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: CAR Wireless test
- Do not attempt this professional task: Fault history
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.
CAR Wireless test
What they doChecks that the remote works and that its batteries are charged, following the CAR Wireless manual.
They must show youthe remote on and talking to the boiler.
In writingthe state of the remote and the batteries.
Fault history
What they doReads the boiler fault log to see how often 51 appears.
They must show youthe 51 history.
In writinghow many times it repeated and what was replaced.
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.
Control from the boiler panel
- Who:
- you.
- How:
- use the buttons on the boiler panel to set the heating and hot water temperatures. Immergas says that with 51 the system can only be controlled from that panel.
- Result that matters:
- whether the boiler heats when controlled from its panel.
- If it heats:
- the fault is in the link with the remote; you have heating while it is sorted.
- If it does not heat or another code appears:
- see the page for that code.
- Evidence to keep:
- a photo of the display showing 51.
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)
CAR Wireless batteries
- Who:
- you.
- How:
- check the remote battery charge and replace the batteries if needed, following the CAR Wireless instruction manual.
- Result that matters:
- whether the remote comes back on and 51 clears.
- If 51 clears:
- it was the batteries; note the date you changed them.
- If 51 stays with new batteries:
- go on to check the remote.
- Evidence to keep:
- the date of the battery change.
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)
Remote operation
- Who:
- you.
- How:
- check that the remote display lights up and responds to the buttons, as its manual describes. Note whether 51 shows all the time or only now and then.
- Result that matters:
- whether the remote works on its own.
- If the remote does not respond with new batteries:
- the problem is the remote; tell the technician.
- If it responds but the boiler still shows 51:
- the link between them is the suspect.
- Evidence to keep:
- a note of when 51 appears.
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)
Remote and link check by the technician
- Who:
- technician from an authorised company.
- How:
- checks the CAR Wireless, its battery charge and the communication with the boiler, following the Immergas manuals.
- Result that matters:
- whether the remote or the link with the boiler is at fault.
- If the remote is faulty:
- repairs or replaces it.
- If the remote is fine:
- tests the communication again and leaves the system checked.
- Evidence to keep:
- a job sheet with what was checked.
Immergas tells the user not to open or tamper with the boiler; its board connections are inside and live.
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
- E51
- E:51
- Error 51 Immergas
- Fujitsu 51
- Fujitsu E51
- Immergas E51
- Victrix 51
- Victrix E51
What it means
On the Victrix Omnia V2 and Victrix Superior 26-35, code 51 is loss of communication with the CAR Wireless, the wireless version of the Immergas remote control. When communication between boiler and remote drops, the boiler signals it and from then on the system can only be controlled from its own control panel. Immergas asks for a check that the CAR Wireless works and that its batteries are charged, following the remote manual. If the fault persists, an authorised company should be called.
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
While 51 lasts, the remote programme does not control the boiler: Immergas says it can only be controlled from its panel. Set the temperature there so you are not left cold or overheating the home.
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)
Symptoms and causes
Probable causes · in order
- Low remote batteriesCommon
Fits if the remote display is blank or faint. Immergas asks for a check of the CAR Wireless battery charge, following its instruction manual.
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)
- Remote not working or not communicatingPossible
Fits if the remote has fresh batteries but 51 stays. Immergas asks for a check that the CAR Wireless works; it talks to the boiler without wires.
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)
Virtual technician
Does 51 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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