GREE U-Match 5 SERIES UNIT SERVICE MANUAL
51
Troubleshooting
：
Malfunction of
condenser
temperature
sensor
Check if the condenser
temperature sensor on
mainboard is inserted on the
needle stand correctly
Disconnect
the temperature sensor and
measure if its resistance is
normal
Correctly insert the
temperature sensor
on the needle stand
Replace the
temperature sensor
Replace the
outdoor
mainboard
Yes
No
No
Yes
Note
：
Please refer to Appendix 1 for the relation between temperature and resistance of temperature sensor.
3.4.11 ―F3‖ Outdoor Ambient Temperature Sensor Error
Error display:
ODU mainboard, IDU wired control and IDU receiver light board will display:
F3
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 sampling AD value exceeds upper limit and lower limit in 5 seconds continuously, report the error.
Possible reason:
■Poor contact between ambient temperature sensor and terminal in mainboard interface
■Ambient temperature sensor is abnormal
■Detecting circuit is abnormal
