GREE U-Match 6 SERIES UNIT SERVICE MANUAL
66
judge the range of AD value, If the sampling AD value exceeds upper limit and lower limit in 5
seconds continuously, report the error.
②
Compare the discharge temperature after the compressor has just started running and after 10
minutes of operation, if the temperature is not changed, report the error.
Possible reason:
■Poor contact between temperature sensor and terminal in mainboard interface;
■Poor contact between temperature sensor and compressor discharge pipe;
■Temperature sensor is abnormal;
■Detecting circuit is abnormal.
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.
3.4.8 “F3” Outdoor Ambient Temperature Sensor Error
Error display:
ODU mainboard, IDU wired controller 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
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