Gree GMV-VQ680WM/C-X Service Manual page 110

Gree
2.28 "bJ" High and low pressure sensor is wrongly connected
Error display: ODU main board, IDU wired controller and IDU receive light board will display
Applicable model: all ODUs
Error judgment condition and method:
Under shutdown status, the high and low pressure sensor has detected that the high pressure test value of
module is 30℃ higher than the low pressure, the unit will report that the high and low pressure is wrongly
connected.
Possible reasons:
■The resistance of high pressure sensor is abnormal, the test value is high.
■The resistance of low pressure sensor is abnormal, the test value is low.
■High and low pressure sensor is wrongly connected.
Troubleshooting:
Step 1: check if the input voltage of high pressure sensor between "4.9~5.1V" and the output voltage
between "0.5~4.5V", if no, replace the high pressure sensor.
Step 2: check if the input voltage of low pressure sensor between "4.9~5.1V" and the output voltage
between "0.5~4.5V", if no, replace the high pressure sensor.
Step 3: if the above inspections on input/output voltage of pressure sensor are normal, exchange the
corresponding terminal of two pressure sensors.
2.29 "bn" Subcooler liquid temperature sensor error
Error display: ODU main board, IDU wired controller and IDU receive light board will display
Applicable model: all ODUs
Error judgment condition and method:
"bd" subcooler air inlet
temperature sensor error
Check the terminal between main
board and temperature sensor to see if it is
loose or any foreign
objects inside?
否
No
Is the temperature
sensor abnormal?
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 temperature
sensor
Yes
Replace the main
control board
108