Gree U-Match 5 Series - “F5” Wired Controller Temperature Sensor Error

GREE U-Match 5 SERIES UNIT SERVICE MANUAL
68
Troubleshooting：
Malfunction of
discharge
temperature
sensor
Check if the
discharge 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.
3.4.13 “F5” Wired Controller Temperature Sensor Error
Error display: IDU wired controller and IDU receiver light board will display F5
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 temperature sensor and terminal in mainboard interface
■Temperature sensor is abnormal
■Detecting circuit is abnormal
Troubleshooting：
Malfunction of
wired controller
temperature
sensor
Replace the
wired controller