Gree UM600PH/A-M, Service Manual

Page: 89 / 121

GREE Duct type Ducted Type Split Air-Conditioner Units
89
Troubleshooting
：
Yes
No
No
“
b2
”
Defrosting
temperature sensor 1
error
Is the terminal between
mainboard and ambient temperature
sensor loose or any foreign objects
inside the terminal?
If it is loosened or there
are foreign objects,
retighten it after
treatment.
Check if the temperature
sensor is abnormal
Yes
Replace the
temperature sensor
Check if the circuit is
abnormal
Yes
Replace the main
control board
(15) “b9” malfunction of gas exit temperature sensor for heat exchanger
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.