How To Fix a Mini Split E7 Error Code

By | April 18, 2020

How To Fix a Mini Split E7 Error Code
If an E7 error code displays on a mini split there are a few things a DIY type person can do before calling an HVAC tech.

Of course, if in doubt always call a professional.

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

What is an E7 error Code on a Mini Split?
An E7 error code is 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.

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 unit.

    If the error codes 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.

    Above is the basic steps a homeowner can do to fix an E7 error code on a mini split.

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

    An E7 error is usually cleared by power cycling both the indoor and outdoor unit by turning power off at the breaker.

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



    One thought 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!!


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