How To Fix an EC Error Code on a Mini Split

By | May 13, 2020

How To Fix an EC Error Code on a Mini Split
An EC error code on a mini split indicates a Refrigerant Leakage Detection Error.

This means the system has detected a leak.

While there may be a leak in the unit keep in mind sensors and boards also can malfunction.

Causes of EC Error Code

  • Refrigerant Leak
  • Sensor
  • Bad connection
  • Bad Indoor PCB
  • Bad Outdoor PCB

Several things can cause an EC error with the main problem usually a leak somewhere in the system.

While a leak is the usual problem a bad sensor, connection, or bad PCB can also give the same error.

Steps To Fix a Mini Split EC Error Code

  1. Power Cycle Off and On the Unit
  2. Power the unit off and turn the power off at the breaker for 2-3 minutes.

    Turn the power back on, if the error is still there follow the next step.

  3. Check for Refrigerant leak
  4. When looking for a leak see if there is any oil is around a joint or spot.

    Leaks can be found a few ways including using soap and water.
    How To Fix an EC Error Code on a Mini Split Leak
    Most HVAC techs will have a refrigerant leak detector that beeps loudly next to a leaking spot.

    If there is a leak it will need to be fixed and refrigerant added back into the system.

    Refrigerant is added by looking up the amount a system uses and adding it in by weight using a scale.

  5. Bad Sensor or Loose Connection
  6. If the sensor that detects refrigerant goes bad it will give an EC error.

    A loose connection can also give the same result.

  7. Bad Indoor or Outdoor Main PCB
  8. A bad PCB board can also give this error.

    Check all other options before replacing a PCB board.



10 thoughts on “How To Fix an EC Error Code on a Mini Split


    Md shariq:. Please check Compressor amps and working fine, maybe pumping problem,
    Today also same issue I faced , TRANE 410 GAS, 1.5 TON,,,
    I check and confirm the compressor getting high amps , so I request replace new compressor ,,, I am working in Dubai,

  2. Md shariq

    My split ac show error EC i have check completely but no leakage no sensor fault no pcb fault but i when checked gas presser he has been going 60 – 25 psi liquid 150psi and some time 100psi section line and liquid line 100 psi and after five minutes later compressors off but fan is working then i have also checked compressors very heat

  3. Jon Burson

    Was showing EC after reset, no more cold air in AC mode

    1. Herbert Buckingham

      Display code CF on front panel of Carrier mini split in heat mode

  4. Herbert Buckingham

    carrier mini split heat mode is not working. CF is on the display

    1. Lee Makhathini

      Maybe it is overcharged, reduce the refrigerant to 80 psi and see how it goes


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