GREE U-Match 5 SERIES UNIT SERVICE MANUAL
84
3.4.33 “Pd” Sensor Connection Protection
Error display: ODU mainboard, IDU wired controller and IDU receive light board will display Pd
Error judgment condition and method:
Sample the AD value of sensor through sensor detecting circuit and judge the range of AD value, If the
sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error.
Possible reason:
■Poor contact between sensor and terminal in mainboard interface
■sensor is abnormal
■Detecting circuit is abnormal
Troubleshooting：
Pd Sensor connection
protection
Correctly insert the sensor
on the needle stand
Check if the discharge sensor on
mainboard is inserted on the needle stand
correctly
YES
Disconnect the sensor and
measure if its resistance is
normal
NO
NO
Replace the sensor
YES
Replace the outdoor
mainboard
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