Midea VRF Series User Manual

V6R VRF 50/60Hz
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Part
6
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Diagnosis and Troubleshooting
2.3 E2: Communication error between MS box and master unit
Digital display output
Description
 Communication error between MS box and master outdoor unit.
 All units stop running.
 Error code is only displayed on the master unit.
Trigger / recover condition
 Trigger condition: MS box and outdoor units cannot communication for 2 minutes after the system power on 20 minutes.
 Recover condition: Communication go back to normal.
 Reset method: Resume automatically.
Possible causes
 Communication wires between MS box and outdoor units not connected properly.
 MS box power supply abnormal.
 Loosened wiring within electric control box.
 The sequence of the PQE signal lines is incorrect.
 Interference from high voltage wires or other sources of electromagnetic radiation.
 Communication wire too long.
 Damaged outdoor main PCB or electric control box communication terminals block.

Midea VRF Series Specifications

General

Compressor Type	Inverter Scroll Compressor
Type	Variable Refrigerant Flow (VRF)
Refrigerant	R410A
Control	Centralized control, individual control
Indoor Unit Types	Wall mounted, cassette, ducted, floor standing
Energy Efficiency	High energy efficiency with DC inverter technology
Indoor Unit Noise Level	19 dB(A) to 45 dB(A)