Gree GMV-VQ680WM/C-X Service Manual page 192

Gree
Is the terminal between
Mainboard and water flow switch loose
or any foreign objects inside?
Is there circulating water in the
circulated waterway of generator?
Replace the water flow switch
of generator directly
Detecting circuit might
be abnormal
2.131 "LF" Shunt valve setting error
Error display: wired controller of hydro box will display
Applicable model: hydro box
Error judgment condition and method:
When setting the corresponding relationship for the floor heating shunt valve and IDU, the generator shall
detect and judge the project code of IDU to see if the nonexistent project code is set or shunt valve setting error
alarm occurs if the same shunt valve is matching with several IDUs (project code)
Possible reasons
■IDU linked with floor heating is offline
■Project code conflict or IP conflict
Troubleshooting
Step 1: check if the IDU corresponding to the shunt valve is offline, if yes, the IDU is deemed offline;
Step 2: check if the project code or IP is conflict, if yes, adjust the relationship between shunt valve and IDU
again, allow several shunt valves to match with the same IDU (project code), but never allow the same shunt
valve to match with several IDUs (project code).
2.132 "LU" Inconsistent IDU branch connecting to the wired
controller which controls multiple indoor units of heat recovery
system
Error display: wired controller will display
"LL" waterflow
switch error
No
No
No
Yes
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If it is loosened or there
Yes
are foreign objects,
retighten it after treatment
Supplement water again for
Yes
the generator waterway
when unblocking the
generator waterway
Replace the main
control board
190