Gree GMV-VQ680WM/C-X Service Manual page 145

Gree
2.78 "F3" Low Pressure Sensor Fault
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
The sensor detection circuit samples the AD value of low pressure 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 low pressure sensor and the main board interface;
■ Poor contact between low pressure sensor and part where the pressure is detected;
■ Abnormal low pressure sensor;
■ Abnormal low pressure sensor detection circuit.
Troubleshooting:
"F3" Low Pressure Sensor
terminal between the main boa rd
and the se nso r g ets loose o r contains
poo r contact between low p ressur e
sensor and th e p art where the pressu re
afte r the sensor i s repla ced?
The detection circuit may
Fault
Whether th e i nter face
foreign matter s?
No
Whether th ere is
is d etected?
No
Is th e p roblem so lve d
No
ope rate impro perly
GMV6 HR DC Inverter VRF Units Service Manual
Yes
Remove the foreign
matters and plug it tightly
Yes
Remove the foreign
matters and plug it tightly
Yes
Replace th e main control
boa rd
143