Causes and Fixes for a Mini Split E6 Error Code

By | July 5, 2023

How To Troubleshoot and Fix a Mini Split E6 Error Code
A mini split with an E6 error usually indicates a communication error.

Of course, be sure to check the manual for your specific unit, and if in doubt, call a professional.

This includes Pioneer, Cooper&Hunter, Carrier and more units but be sure to check the error codes for your specific unit.

There can be a difference in errors depending on the manufacturer and model, so always verify your mini split error code with the manual for the unit.

Below are the steps to troubleshoot and fix an E6 error code on most units.

You will need to know how to use a multi meter for checking voltages and continuity.

What is an E6 error Code on a Mini Split?

An E6 error code is usually a communication error with the inside unit is not able to communicate with the outside unit.

This includes the high voltage and low voltage lines.

What Causes an E6 Code on a Mini Split?

  • Faulty Wiring
  • Open or bad communication wires
  • Bad high voltage wiring
  • Bad control board

The most common cause of an E6 error is the communication wires between the inside and outside units.

This includes the voltage at the outside unit (115/230) and the voltage going to the inside unit.

Most all mini split units have high voltage going to the outside unit, which sends a lower voltage to the inside unit.

There is also a 3-7 communication line wires between each unit, all of which will need to be checked for a bad connection or an open in a wire.

If all the wiring and voltages are good, the likely problem will be one of the control boards on the inside or outside units.

How To Reset an E6 Code on a Mini Split?

To reset an E6 Code code, power down the unit and turn the power off going to the system at the breaker or disconnect.

With the power off at the breaker or disconnect, wait 5-minutes and then power the system back on.

If the error comes back, more troubleshooting will need to be done to find the source of the problem.

Steps to Troubleshoot and Fix an E6 code

Voltages will vary between mini split units. A schematic will be on the inside door of both the indoor and outdoor units.

  1. First, check the voltage on the outside unit.
  2. Check the voltage on the inside unit.
  3. Check the communication signal wires between the inside and outside units for a bad connection or an open wire.
  4. A common method to check the wires for an open is to turn off all power to the system, cross two wires, and check them on the other side for continuity with a meter.
  5. If the voltages are correct and the communication line is good, the problem is most likely a bad control board on the inside or outside unit.

An E6 error code is usually given when the main PCB board is having a communication problem.

The problem usually is in the voltage or communication lines.

Keep in mind bad wiring can damage a control board, with both needing to be replaced in some scenarios.

If all the communication wiring and voltages test good, the problem is most likely a bad control board.

At that point, it would be best to call a professional HVAC tech to fix the unit.

Category: Mini split heating and cooling air conditioner heat pump systems

About Aaron H. Benetti

Aaron H. Benetti an HVAC technician who has worked in the field since 1991. He began his career as an HVAC installer and later began doing troubleshooting and repairs. Around 2010, he began to write books on HVAC topics, mainly tutorials and how-to information. Currently, Aaron works as an HVAC tech and also writes many articles and posts for websites as well as books and videos on HVAC topics.

12 thoughts on “Causes and Fixes for a Mini Split E6 Error Code


    I already checked all the wires between the two units were OK. voltage is OK also .Is there any relation ship with capacitor and the main board .THANK YOU

  2. Ruben Oliveras Martinez

    When it rains, does the E-6 code turn on, any ideas?

    1. Benito

      I have a mirage mini split with an error code E6.
      I checked voltages. Communication wires.
      Replaced indoor and outdoor boards,
      and still outdoor and indoor unit don’t work.
      Any suggestions. I would greatly appreciate it.

  3. Caroline hall

    My profittness treadmill says error 6 nothing works how do I fix this all wires look ok

    1. Samekia

      is there a way to fix this problem if what was done in the video doesn”t without buying a new board?

  4. Walt Vinoski

    This is an incomplete demonstration.
    Where is the details on how to check and measure the communications lines?

    The unit has power, but E6 error does not go away, there should be an electrical schematic with the manual and inside the unit, but it does not have one. My solution is to throw away the unit and purchase a Mitsubishi that is very easy to work on and trouble shoot down to the component level.

    1. Hawkwind212

      Every unit will have different voltages and resistance. They should be in the manual for the unit. Mitsubishi are good units but so are many other brands. Probably best to call a professional.

  5. modou

    can someone please help me i have a problem wit my west point Stan air conditioner 48000btu error e6

    1. Ysrael Senelis

      Hi if you made the trouble shut for fix E6 error and doesn’t have the solution, your problem is inthe outside board you need to check the transistor 30j122A and the fuse bought of them bad .


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