Gree GMVVQ1015WM/C-X, Service Manual

Page: 145 / 433

Gree GMV6 HR DC Inverter VRF Units Service Manual
143
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:
Yes
No
"F3" Low Pressure Sensor
Fault
Remove the foreign
matters and plug it tightly
Yes
The detection circuit may
ope rate impro perly
Yes
Replace th e main control
boa rd
Whether th ere is
poo r contact between low p ressur e
sensor and th e p art where the pressu re
is d etected?
No
Whether th e i nter face
terminal between the main boa rd
and the se nso r g ets loose o r contains
foreign matter s?
Remove the foreign
matters and plug it tightly
No
Is th e p roblem so lve d
afte r the sensor i s repla ced?