V6-i VRF 50/60Hz
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Midea V6-i Series Service Manual
2.3 E2: Communication error between indoor and outdoor unit
Digital display output 2.3.1
Description 2.3.2
Communication error between indoor and outdoor unit.
All units stop running.
Error code is only displayed on the outdoor unit.
Trigger / recover condition 2.3.3
Trigger condition: Indoor units and the outdoor unit cannot communicate for 2 minutes after the system is powered
on for 20 minutes.
Recover condition: Communication go back to normal.
Reset method: Resume automatically.
Possible causes 2.3.4
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.