- HVAC
- Air conditioner
25
Toshiba 25 on an air conditioner: refrigerant leak detected
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
On Toshiba R32 wall-mounted splits, 25 means the sensor has detected a refrigerant leak: the unit stops, beeps, the A lamp flashes and the fan runs forced. Ventilate the room, avoid flames and call a certified technician.
Safety first
Stop and check this first
- Toshiba warns that R32 settles near the floor and can give off a poisonous gas in contact with a flame; in a poorly ventilated room no flame should be used until it is ventilated. At home: ventilate, put out flames and do not restart the unit.
- Leak searching, repair and R32 recharging are work for a technician with an F-gas certificate and tools made for R32.
Safe checks you can perform
- What the unit does when it detects a leak
- Ventilation and no flames
- Leak search with a detector
Leave these tasks to a qualified professional
- Do not attempt this professional task: Documented leak check
- Do not attempt this professional task: Replace the sensor only after ruling out a leak
- Do not attempt this professional task: Leak-free test after the repair
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.
Documented leak check
What they doThe technician checks the circuit with an HFC leak detector and records where the leak is or that there is none.
They must show youthe detector in use and the leak point, if any.
In writingthe search result and the repair done.
Replace the sensor only after ruling out a leak
What they doIf no leak is found, the technician replaces the gas sensor as Toshiba says and clears the code in service mode.
They must show youthe negative leak test before the replacement.
In writingthe new sensor reference and the reason.
Leak-free test after the repair
What they doAfter the repair, Toshiba asks for confirmation that no refrigerant leaks before the unit goes back into service.
They must show youthe final leak-free check.
In writingdate, method used and result.
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.
What the unit does when it detects a leak
- Who:
- you.
- How:
- look at the indoor unit: per Toshiba, with 25 operation stops, it beeps, the A lamp flashes and the fan keeps running forced.
- Result that matters:
- that you see those signs, or code 25 on the remote in service mode.
- If they match:
- treat it as a possible R32 leak and go to the next step.
- If the remote shows 0E or 26:
- it is a warning about the gas sensor itself, not this page.
- Evidence to keep:
- a photo of the lamp and the remote and the time it started.
Evidence: Toshiba service manual SVM-22103, R32 wall-mounted indoor units RAS-M05G3KVSG-E and RAS-M05G3KVSGB-E
Ventilation and no flames
- Who:
- you.
- How:
- open doors and windows, switch off heaters or nearby flames and leave the unit alone. Toshiba notes R32 is heavier than air, settles near the floor and can give off a poisonous gas in contact with a flame.
- Result that matters:
- the room ventilated and free of flames until the technician arrives.
- If you notice a smell or feel unwell:
- leave the room, keep it ventilating and tell the technician.
- If you notice nothing:
- keep ventilating anyway: the sensor detected something that has to be checked.
- Evidence to keep:
- a note of the time, what you did and any smell.
Evidence: Toshiba service manual SVM-22103, R32 wall-mounted indoor units RAS-M05G3KVSG-E and RAS-M05G3KVSGB-E
Leak search with a detector
- Who:
- an F-gas certified air conditioning technician.
- How:
- searches for the leak with a gas detector made for HFC refrigerants and, if there is none, replaces the sensor as Toshiba says.
- Result that matters:
- whether there is a real leak or the sensor alarmed without one.
- If the leak is found:
- the cause is confirmed; repair and recharge are certified work.
- If there is no leak:
- Toshiba says to replace the sensor.
- Evidence to keep:
- a job sheet with the leak point or the negative test and the sensor reference.
R32 circuit, a flammable refrigerant that needs dedicated tools: certified technician only.
Evidence: Toshiba service manual SVM-22103, R32 wall-mounted indoor units RAS-M05G3KVSG-E and RAS-M05G3KVSGB-E
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
- HVAC
- Brand
- Toshiba
- Product type
- Air conditioner
Known code variants
- Toshiba 25
- Toshiba error 25
What it means
Toshiba assigns code 25 to refrigerant leak detection by the gas sensor in the indoor unit. The unit stops operation, beeps, flashes the A lamp and forces the fan on. Toshiba's action is to check for the leak and, where needed, replace the sensor. The code alone does not prove there is a leak: it can be a real leak in the R32 circuit or the sensor itself, and only the technician's check separates them.
Warnings and stop conditions
- Higheditorial warning
Toshiba warns that R32 settles near the floor and can give off a poisonous gas in contact with a flame; in a poorly ventilated room no flame should be used until it is ventilated. At home: ventilate, put out flames and do not restart the unit.
Evidence: Toshiba service manual SVM-22103, R32 wall-mounted indoor units RAS-M05G3KVSG-E and RAS-M05G3KVSGB-E
- Highsource verified
Leak searching, repair and R32 recharging are work for a technician with an F-gas certificate and tools made for R32.
Evidence: Toshiba service manual SVM-22103, R32 wall-mounted indoor units RAS-M05G3KVSG-E and RAS-M05G3KVSGB-E
Symptoms and causes
Probable causes · in order
- Real leak in the R32 circuitCommon
The first thing Toshiba says to check. It is confirmed with a leak detector made for HFC refrigerants on joints and pipes.
Evidence: Toshiba service manual SVM-22103, R32 wall-mounted indoor units RAS-M05G3KVSG-E and RAS-M05G3KVSGB-E
- Gas detection sensorPossible
Toshiba says to replace the sensor if no leak is confirmed. It is different from sensor failure (code 0E) and sensor end of life (code 26), which have their own codes.
Evidence: Toshiba service manual SVM-22103, R32 wall-mounted indoor units RAS-M05G3KVSG-E and RAS-M05G3KVSGB-E
Virtual technician
Does 25 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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