How To Fix an E0 or F4 Mini Split Error Code

By | September 15, 2019


When a mini split unit displays an E0 F4 Error code it indicates there is an EEPROM error.

The main chip of the indoor or outdoor PCB cannot receive feedback form the EEPROM chip.

An EO error code on a Mini Split is Indoor EEPROM Error.
How To Fix an E0 F4 Mini Split Error Code EO

An F4 error code on a Mini Split is Outdoor EEPROM Error.
How To Fix an E0 F4 Mini Split Error Code F4

EEPROM stands for Electrically Erasable Programmable Read-Only Memory and is a small storage space that contains the code for a mini split to operate.
How To Fix an E0 F4 Mini Split Error Code Eeprom chip
Much like a hard drive on a PC the EEPROM is a small computer chip that has code written on for instructions on how a mini split should operate.

A mini split has two main computer boards called PCB’s both on the outside and inside units.

The EO code is for the indoor unit while the F4 code is for the outdoor unit.

How To Fix an E0 or F4 Mini Split Error Code

  1. Power off the unit and turn off the breaker or disconnect.
  2. Wait 2-3 minutes and power the unit back on.

If the error code comes back the indoor or outdoor PCB likely needs replaced.

Wiring can sometimes come loose or have a bad connection. Re-seating all the wires on a PCB board can sometimes clear the error.



 




 

7 thoughts on “How To Fix an E0 or F4 Mini Split Error Code

  1. BASHA

    Thanks a lot sir IAM too much happy with your valuable explanation…😃😃😃😃

    Reply
    1. Paul

      E0 error code was communication cable to outdoor unit labeled wrong. Look at wiring diagram on inside unit. The white and black wire on outside unit needs to be reversed. Be sure to use the black wire for power with the stranded wires to the disconnect box. The load wires may be reversed also.

      Reply
  2. Martin

    I have the E0 error, I don’t feel very cool air coming through the unit all the valves are open..
    Any suggestions?

    Reply
    1. Paul

      The EO error on mine was the communications cable to outside unit (compressor) was labeled wrong. Wires 2 and 3 were reversed on outside unit (compressor). Look at the wiring diagram on inside unit and you’ll see that the black and white wire on the compressor side are reversed. That’s what was wrong with mine.
      Also be sure to use the stranded wire cable from disconnect box to the compressor (outside unit).
      Your problem could be the eeprom on the inside air handler board ? I’m surprised your getting any air flow though.You may want to check to see if it’s charged enough?

      Reply

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