Gree GMV5E Series Service Manual page 186

GREE
Troubleshooting:
2.2.4.63 "F7" Compressor 3 discharge temperature sensor error
Error display: ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
Sample the AD value of temperature sensors through temperature sensors circuit and judge the
range of AD value; if the sampled AD value exceeds upper limit and lower limit in 30 seconds
continuously, report the error.
Possible reason：
■Poor contact between discharge temperature sensor and terminal in mainboard interface
■Discharge temperature sensor is abnormal
■Detecting circuit is abnormal
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
182