Gree GMV5E Series Service Manual page 158

GREE
2.2.4.24 "b8" Malfunction of outdoor humidity sensor
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 sensor through temperature sensor detecting 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 temperature sensor and terminal in mainboard interface
■Temperature sensor is abnormal
■Detecting circuit is abnormal
Troubleshooting:
2.2.4.25 "b9" Malfunction of gas temperature sensor of heat exchanger
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 sensor through temperature sensor detecting 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 temperature sensor and terminal in mainboard interface
■Temperature sensor is abnormal
■Detecting circuit is abnormal
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
154