Gree GMV-VQ680WM/C-X Service Manual page 124

Gree
2.50 "d1" Poor Indoor Circuit Board
Fault display: wired controller of indoor unit and receiver of indoor unit display
Fault diagnosis:
Check whether the address chip and memory chip of the indoor unit's main board can be read
properly. If not, the fault is generated.
Possible causes:
■ Abnormal address chip;
■ Abnormal memory chip.
Troubleshooting:
Replace the main control board.
2.51"d2" Water tank temperature sensor error
Error display: wired controller of hydro box displays
Applicable model: hydro box
Error judgment condition and method:
Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge
the range of AD value. If the sampling AD value exceeds upper limit and lower limit in 5 seconds
continuously, report the error
Possible reasons:
■Poor contact between water tank temperature sensor and terminal in main board interface
■Water tank temperature sensor is abnormal
■Detecting circuit is abnormal
Troubleshooting:
"d2" water tank temperature sensor error
Is the terminal between
mainboard and water tank
temperature sensor loose or any
foreign objects inside?
No
Replace the temperature
sensor 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 of hydro box
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