What is an E3 Error Code? - MRCOOL DIY Ductless Mini Split

An E3 error code occurs when the fan speed of your MRCOOL DIY Ductless Mini Split air handler is too low for a certain amount of time.

This could be due to a wiring mistake, faulty fan assembly, faulty fan motor, or a faulty control board. Before touching or maneuvering the wires, be sure to turn off the power from the disconnect box for the outdoor unit, or from the breaker box for the indoor unit.

Troubleshooting An E3 Error Code

First, you should check the wiring of the fan motor to make sure everything is connected properly and not loose. It is possible that the fan motor or the control board will have to be replaced.

In any case, when you have an E3 error code, it is best to call the MRCOOl Warranty department at 270-366-0457 so they can help you determine the reason for the E3 error code.

Other MrCool DIY Error Codes

  • E0 - Indoor unit EEPROM parameter error
  • E1 - Indoor / outdoor units communication error
  • E2 - Zero-crossing signal detection error
  • E3 - Indoor fan speed has been out of control
  • E4 - Indoor room temperature sensor T1 open circuit or short circuit
  • E5 - Evaporator coil temperature sensor T2 open circuit or short circuit EC - Refrigerant leakage detection
  • F0 - Overload current protection
  • F1 - Outdoor ambient temperature sensor T4 open circuit or short circuit
  • F2 - Condenser coil temperature sensor T3 open circuit or short circuit
  • F3 - Compressor discharge temperature sensor TP open circuit or short circuit
  • F4 - Outdoor unit EEPROM parameter error
  • F5 - Outdoor fan speed has been out of control
  • P0 - IPM malfunction or IGBT over-strong current protection
  • P1 - Over voltage or over low voltage protection
  • P2 - High temperature protection of IPM module or compressor top
  • P3 - Outdoor ambient temperature too low
  • P4 - Inverter compressor drive error
  • P5 - Indoor units mode conflict (multi-zone ONLY)
  • P6 - Low pressure protection(Only for 36K)
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