Gree GMV-VQ680WM/C-X Service Manual page 193

Gree
Applicable model: wired controller connecting to several IDUs
Error judgment condition and method:
When the controller which controls multiple indoor units is connected to several indoor units, different indoor
units are connected under different mode exchangers, or connected under different branches of the same mode
exchanger.
Possible reasons:
■Indoor unit connecting to the wired controller which controls multiple indoor units is not in the same branch of
the same mode exchanger
■Communication connection between the IDU and mode exchanger connected to the wired controller which
controls multiple indoor units is wrong
Troubleshooting:
Step 1: check if the indoor unit connected to the wired controller which controls multiple indoor units in the
same branch of the same mode exchanger, if no, please connect the indoor units under different branches to
different wired controllers;
Step 2: if the indoor unit connected to the wired controller which controls multiple indoor units is in the same
branch of the same mode exchanger, please check if the indoor unit communication cord connected to the
communication port of the corresponding branch of mode exchanger, if no, please revise the connection of
communication cord;
2.133 "Ln" Lifting panel return air frame reset error
Error display: IDU lamp panel and IDU wired controller will display
Applicable model: multi VRF indoor unit with the lifting panel
Error judgment condition and method:
Report alarm by judging the status of limit switch 1 and 2.
Possible reasons:
■Poor contact between limit switch and terminal in main board interface
■Limit switch is abnormal
■Detecting circuit is abnormal
Troubleshooting:
GMV6 HR DC Inverter VRF Units Service Manual
191