GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
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2.2.4.16
“Ad” Limited operation status
Error display:
ODU mainboard, IDU wired controller and IDU receive light board will display
Error judgment condition and method:
This code is status code, which means the system has set the emergency operation status, but
emergency operation time has exceed the limited requirements, at this time, the unit is not allowed to
conduct emergency operation.
Possible reason
：——
Troubleshooting:
status code, no troubleshooting.
2.2.4.17
“b1” Outdoor ambient temperature sensor error
Error display:
ODU mainboard, 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 sampled AD value exceeds upper limit and lower limit in 30 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:
