Midea MV5-X252W/V2GN1 Service Manual page 55

V5 X VRF 50/60Hz
4.4 E2 Troubleshooting
4.4.1 Digital display output
4.4.2 Description
 Communication error between indoor and master unit.
 All units stop running.
 Error code is only displayed on the master unit.
4.4.3 Possible causes
 Communication wires between indoor and outdoor units not connected properly.
 Indoor unit power supply abnormal.
 Loosened wiring within electric control box.
 Interference from high voltage wires or other sources of electromagnetic radiation.
 Communication wire too long.
 Damaged main PCB or electric control box communication terminals block.
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