Gree GMV-VQ680WM/C-X Service Manual page 191

Gree
2.128 "LH" Poor Air Quality Alarm (Reserved Code, Not Yet Applied)
2.129 "LC" Unmatched Models of Indoor and Outdoor Units
Fault display: wired controller of indoor unit and receiver of indoor unit display
Applicable models: some indoor units
Fault diagnosis:
The unit triggers the fault of "unmatched indoor and outdoor units" when it fails to recognize some
indoor units or equipment.
Possible causes:
■ The indoor unit is incompatible with the outdoor unit.
Troubleshooting:
The unit triggers the fault when it is connected to indoor units or equipment that it cannot recognize,
such as floor heating in a modular DC inverter VRF system. In this case, to troubleshoot this fault, you
can remove the involved indoor units or change the outdoor unit to make it match the indoor units.
2.130"LL" Water flow switch error
Error display: wired controller of hydro box will display
Applicable model: hydro box
Error judgment condition and method:
Detect if the protection signal of water flow switch is triggered. After turning on the water pump, waterflow switch
protection signal is detected in 15 consecutive seconds, then report alarm.
Possible reasons:
■Poor contact between limit switch and terminal in main board interface
■Water return of generator is not smooth or lacking water
■Water flow switch is abnormal
■Detecting circuit is abnormal
Troubleshooting:
GMV6 HR DC Inverter VRF Units Service Manual
189