Gree GMV-280WL/C-X - Troubleshooting; Troubleshooting Principle; Communication Malfunction

GREE DC Inverter Multi VRF System II Service Manual
88
3 Troubleshooting
Troubleshooting principle
1) Communication malfunction
Communication
malfunction
Check whether indoor unit and
outdoor unit is power supplied
Energize indoor unit and
outdoor unit
Measure whether the
communication wire is in
normal
Replace communication
wire
NO
NO
Check whether the
communication wire between
indoor unit and outdoor unit is
correct
Connect the communication
wire for indoor unit and
outdoor unit correctly
NO
YES
YES