Gree GMV-VQ680WM/C-X Service Manual page 103

Gree
"b4" Sub coo ler's Li quid
Outlet Tempe ratu re Sensor
terminal between the main boa rd and
temperature sensor gets loose or
contains forei gn matters?
Whether th e tempera tur e
The detection circuit may
2.21 "b5" Subcooler's Gas Outlet Temperature Sensor Fault
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
The temperature sensor detection circuit samples the AD value of temperature sensor and
determines the range of AD value. When the sampled AD value exceeds the limits for 30 consecutive
seconds, the fault is generated.
Possible causes:
■ Poor contact between the temperature sensor and the main board interface;
■ Abnormal temperature sensor;
■ Abnormal detection circuit.
Troubleshooting:
Fault
Whether th e i nter face
No
sensor is abn ormal?
No
ope rate impro perly
GMV6 HR DC Inverter VRF Units Service Manual
Yes
matters and plug it tightly
Yes
Replace th e tempera tur e
Yes
Replace th e main control
boa rd
101
Remove the foreign
sensor