Gree GMV-VQ680WM/C-X Service Manual page 218

Gree
Possible reasons:
■ Poor contact between IFD feedback side and main board interface terminal
■IFD abnormality
■Detecting circuit is abnormal
Troubleshooting:
Check the terminal between main
board and IFD to see if it is loose or any
2.176 "y8" Indoor air box sensor general error
Error display: ODU main board and IDU wired controller will display
Applicable model: IDU with air box
Error judgment condition and method:
Main board, air box communication abnormality and air box test data (temperature, humidity and CO
concentration or PM2.5 concentration) has exceeded the set upper and lower limiting value.
Possible reasons:
■Poor contact between main control board and air box communication terminal
■Air box detection is abnormal
Troubleshooting:
"yA" IFD error
foreign objects inside?
No
Replace the IFD directly,
is the error disappeared?
No
Detecting circuit might
be abnormal
GMV6 HR DC Inverter VRF Units Service Manual
Yes If it is loosened or there are
foreign objects, retighten it
after treatment
Yes
Replace the main
control board
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