How To Fix a Mini Split E7 Error Code

By | June 14, 2023

How To Fix a Mini Split E7 Error Code
If you have a mini split with an E7 error code, the usual cause is a mode conflict or a communication issue.

There are also a few things a DIY type person can do before calling an HVAC tech. Of course, if in doubt, always call a professional HVAC tech.

Below are the things to check and how to reset an E7 error code.

Be sure to always check your mini split manual as there can be variations for an E7 code meaning.

This includes Pioneer, 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 a manufacturer and model, so always verify your mini split error code with the manual for the unit.

What is an E7 Error Code on a Mini Split?

An E7 error code is usually given when the indoor unit and outdoor unit are in different modes.

For example, the outdoor unit may be in heat mode while the indoor unit is in cool mode.

This often happens when the outdoor unit can not detect whether the inside unit has turned on or what mode it is in.

Often resetting the unit by removing the power for 2-3 minutes will clear the error.

If the error returns, more troubleshooting will need to be done.

What Causes an E7 Code on a Mini Split?

  • Bad communication wires.
  • Faulty wiring, such as a ground wire.
  • Bad Control Board.

How To Reset an E7 Mini Split Error Code

  1. Power off both indoor and outdoor units and turn off the breaker or disconnect.
  2. Wait 2-3 minutes and power the units back on.

Power resetting the indoor and outdoor unit at the breaker will reset the system.

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

Troubleshoot an E7 Error Code

  1. Check communication wires between indoor and outdoor units.
  2. Check for loose wires.
  3. Check the PCB boards on both indoor and outdoor units.

A mini split with an E7 error usually points to a mode conflict that needs a reset.

An E7 error usually indicates a mode problem between the indoor and outdoor units.

The error is usually cleared by power cycling both the indoor and outdoor unit by turning the power off at the breaker.

For more advanced troubleshooting, the wiring voltage and PCB board will need to be checked.

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.

4 thoughts on “How To Fix a Mini Split E7 Error Code

  1. Leslie Richmond

    Thanks for the tip it saved me an expensive service call for something that took me 5 minutes!!

  2. Steve

    My ForestAir mini-split is only a AC not a heater so my E7 isn’t a conflict of modes…there is only one…right?

  3. eyob tilahun

    what is the case of error code E7 in air conditioner ?
    in midea A/C
    PLEASE how to solve this problem please help me

  4. Daberechukwu

    My ac is showing me e7error what can I do or how can I get yr number to call


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