1.2 Exception Analyzing and Troubleshooting
1.2.1 “d1” Indoor circuit board error
Error display:
IDU wired controller and IDU receive light board will display
Error judgment condition and method:
Check if the reading of address chip and memory chip of IDU mainboard is normal. If the data of
address chip and memory chip cannot be read, it is abnormal
Possible reason:
■Address chip is abnormal
■Memory chip is abnormal. Replace main control board directly
Troubleshooting:
Replace main control board directly
1.2.2 “d3” Ambient temperature sensor error
Error display:
IDU wired controller and IDU receive light board will display
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
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