GREE Duct type Ducted Type Split Air-Conditioner Units
90
Troubleshooting：
Yes
No
No
“b9”heat exchanger
outlet temperature
sensor 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 temperature
sensor
Check if the circuit is
abnormal
Yes
Replace the main
control board
“C2” driven communication malfunction between main board and inverter compressor
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
：The outdoor unit cannot detect the data of inverter
compressor drive board in 30s, then it will give alarm.
Possible reason
：
1) The communication cable is not correctly connected.
2) The inverter compressor drive board is abnormal.
3) The main board is abnormal.
Troubleshooting
：
1) Check if the cable connecting the control board and the compressor's drive board is loose.
If yes, reconnect it;
2) Check if the cable connecting the control board and compressor's drive board is broken. If
yes, replace the cable;
3) Check the contact of the communication cable connecting the control board and
compressor's drive board;
4) Replace the control board. If the fault is solved, the control board is faulty. Replace the
compressor's drive board. If the fault is solved, the compressor's drive board is faulty.
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