Midea MV6-R1000WV2RN1, Service Manual

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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.