- HVAC
- Air conditioner
EC
Samsung EC on an air conditioner: gas leak or sensor fault
Risk level
High
Professional inspection is recommended.
Urgency
High
Quick answer
EC means the Samsung inverter air conditioner has detected a possible refrigerant gas leak or that a sensor is not working. Samsung suggests switching off at the main power supply and back on once: if it clears, it may have been the sensor; if not, ventilate and call a technician.
Safety first
Stop and check this first
- With EC, ventilate the room, do not use flames or appliances that spark nearby and do not reset the unit over and over. Many units use R32, which is flammable: check the label and leave leak finding and charging to a certified technician.
- EC clearing after a switch off and on does not rule out a leak: if it comes back or the unit cools worse, request the check anyway.
Safe checks you can perform
- Ventilate and rule out flames
- One switch off at the main power supply
- Note when EC appears
- Leak test and sensor check
Leave these tasks to a qualified professional
- Do not attempt this professional task: Locate the leak with a detector
- Do not attempt this professional task: Recharge only after a tightness test
- Do not attempt this professional task: Check the sensor if there is no leak
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.
Locate the leak with a detector
What they doThe technician goes over joints, pipes and units with a leak detector and measures pressures before adding any refrigerant.
They must show youthe detector result at each joint and the pressures measured in the operating mode.
In writingthe EC code, where the leak was, how it was repaired and the date.
Recharge only after a tightness test
What they doAfter repairing the leak, the technician runs a tightness test and charges the refrigerant type and amount on the rating plate.
They must show youthe rating plate with type and charge and the final pressure reading.
In writingthe refrigerant recovered and charged (kg and type) and the tightness test result.
Check the sensor if there is no leak
What they doIf there is no leak and the charge is correct, the technician measures the sensor and its connection against Samsung's values before replacing it.
They must show youthe sensor reading compared with the manufacturer's table and the condition of its connection.
In writingthe sensor measurement, the part replaced and why, and the date.
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.
Ventilate and rule out flames
- Who:
- you.
- How:
- open the windows of the room with the indoor unit, do not use flames or appliances that spark nearby, and switch the unit off with the remote while you ventilate.
- Result that matters:
- that the room is ventilated before any other step.
- If you notice an odd smell, hissing or frost on the pipes:
- do not switch it back on and call a technician.
- If you notice nothing:
- go on to the main power reset, once only.
- Evidence to keep:
- date, time, what you noticed (smell, noise, frost) and the mode the unit was in.
Evidence: Samsung: How to fix error codes on your inverter air conditioner
One switch off at the main power supply
- Who:
- you.
- How:
- switch the unit off at the main power supply (breaker or plug), wait a few minutes and switch it back on, as Samsung states for EC. Do it only once.
- Result that matters:
- whether EC clears or shows again.
- If EC clears:
- according to Samsung it may have been the sensor; note the date and request a check if it repeats.
- If EC returns:
- stop using the unit and do not repeat resets; leave the power off and call a technician.
- Evidence to keep:
- date and time of the switch off and whether EC came back, and after how long.
Evidence: Samsung: How to fix error codes on your inverter air conditioner
Note when EC appears
- Who:
- you.
- How:
- write down the mode it was in, whether it was cooling or heating less than before and whether there was a recent installation or repair; copy the model from the indoor unit label.
- Result that matters:
- giving the technician details that help tell a leak from a sensor fault.
- If the unit had been cooling worse for days:
- say so when booking, it points to low refrigerant.
- If it worked well until EC:
- say that too, the technician will check the sensor.
- Evidence to keep:
- model, dates of each EC, observed performance and date of the last service.
Evidence: Samsung: How to fix error codes on your inverter air conditioner
Leak test and sensor check
- Who:
- certified refrigerant and HVAC technician (F-gas certified in the EU).
- How:
- with the unit stopped, search for leaks with a detector at joints and units, measure pressures and temperatures in the relevant mode and check the sensor involved against Samsung's values.
- Result that matters:
- whether there is a located leak, whether the charge is correct or whether the fault is the sensor.
- If there is a leak:
- it is repaired, a tightness test is done and the unit is charged per the rating plate.
- If there is no leak and the charge is correct:
- the technician replaces or reconnects the failing sensor.
- Evidence to keep:
- a job sheet with the detector result, the pressures and the refrigerant recovered or charged.
Refrigerant is under pressure and R32 is flammable; mains voltage is also present: certified technician only.
Evidence: Samsung: How to fix error codes on your inverter air conditioner
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
- Samsung
- Product type
- Air conditioner
Known code variants
- Bosch EC
- calentador Junkers EC
- deshumidificador Midea EC fuga refrigerante
- E C
- ec
- EC fuga de gas Samsung
- error EC aire Samsung
- Hydronext 2400S EC
- Hydronext 5600S EC
- Hydronext 5700S EC
- Junkers EC
- Midea dehumidifier EC refrigerant leak
- Midea EC
- Midea MAD50 EC
- Samsung AC EC error
- Samsung EC
- Samsung EC gas leak
What it means
On Samsung India's support page about inverter air conditioner codes (CF, CI, dF and EC), EC appears when a gas leakage is detected or the sensor is not functioning. Samsung says to switch the unit off from the main power supply and turn it back on; if the error disappears, there might have been a sensor issue. Codes and how they appear may differ by model and country. The code alone never proves that there is a leak or that the sensor is faulty: a technician confirms that with measurements.
Warnings and stop conditions
- Higheditorial warning
With EC, ventilate the room, do not use flames or appliances that spark nearby and do not reset the unit over and over. Many units use R32, which is flammable: check the label and leave leak finding and charging to a certified technician.
Evidence: Samsung: How to fix error codes on your inverter air conditioner
- Mediumeditorial warning
EC clearing after a switch off and on does not rule out a leak: if it comes back or the unit cools worse, request the check anyway.
Evidence: Samsung: How to fix error codes on your inverter air conditioner
Symptoms and causes
Probable causes · in order
- Refrigerant gas leakCommon
This is the first cause Samsung gives for EC: the unit has detected a possible gas leakage in the refrigerant circuit.
Evidence: Samsung: How to fix error codes on your inverter air conditioner
- Sensor not functioningPossible
Samsung says that if EC disappears after switching off and on at the main power supply, it may have been a sensor issue.
Evidence: Samsung: How to fix error codes on your inverter air conditioner
Virtual technician
Does EC 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
Samsung: How to fix error codes on your inverter air conditioner
Samsung Electronics · 2026 · official_doc
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