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Midea Air Conditioner Error Code E2, E3, E4 Troubleshooting Guide

Troubleshooting E2, E3, E4

E2

E3

E4

Description

  • E2 indicates an indoor ambient temperature sensor error.
  • E3 indicates an indoor heat exchanger midpoint temperature sensor error.
  • E4 indicates an indoor heat exchanger outlet temperature sensor error.

Possible Causes

  • The temperature sensor is not connected correctly or is faulty.
  • Main PCB damaged.

Procedure

Error Codes: E2 / E3 / E4

Step 1: Check the temperature sensor connection on the main PCB.

Is the connection loose?

  • Yes: Ensure the sensor is correctly connected.
  • No: Proceed to Step 2.

Step 2: Assess the temperature sensor's condition.

Has the temperature sensor short-circuited or failed?

  • Yes: Replace the sensor.
  • No: Replace the indoor main PCB.

Notes

  1. The connection port for the indoor unit ambient temperature sensor, the connection port for the indoor heat exchanger midpoint temperature sensor, and the connection port for the indoor heat exchanger outlet temperature sensor on each type of indoor unit main PCB.
  2. Measure the sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is not consistent with the sensor resistance characteristics table, the sensor has failed.

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