Gree CF01000730, Service Manual

Page: 87 / 129

GREE Duct type split Air conditioner Inverter Series
85
can’t be started.
Possible reason
：
——
Troubleshooting
：
——
(12) “Ad” limit operation
Fault display: the main board of outdoor unit and indoor unit will display .
Applicable model: all models.
Judgment condition and method for the fault
：
It is a status code, which means emergency
operation status is set, however, emergency operation time has exceeded the limit requirement, at this
time, the unit is not allowed to conduct emergency operation.
Possible reason
：
——
Troubleshooting
：
——
(13) “b1” malfunction of outdoor ambient temperature sensor
Fault display:
the main board of outdoor unit and indoor unit will display .
Applicable model:
all outdoor units.
Judgment condition and method for the fault
：
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 30 seconds
continuously, report the error.
Possible reason
：
1) Poor contact between ambient temperature sensor and terminal in mainboard interface.
2) Temperature sensor is abnormal.
3) The detected circuit is abnormal.