GREE U-Match 5 SERIES UNIT SERVICE MANUAL
49
Troubleshooting：
3.4.9 ―F1‖ Evaporator Temperature Sensor Error
Error display: IDU wired control and IDU receiver light board will display F1
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
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