Midea V4+R Series - 4.2 E0 Troubleshooting; 4.2.1 Digital display output; 4.2.2 Description; 4.2.3 Possible causes

V4+R VRF 50/60Hz
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Part 5 - Diagnosis and Troubleshooting
4.2 E0 Troubleshooting
Digital display output 4.2.1
Description 4.2.2
 Communication error between outdoor units.
 All units stop running.
 Error code is only displayed on the slave unit with the error.
Possible causes 4.2.3
 Incorrect outdoor unit address setting.
 Communication wires between outdoor units not connected properly.
 Loosened wiring within electric control box.
 Damaged main PCB or electric control box communication terminals block.