Gree GMV5 Series Service Manual page 166

12. Analyzing of drive control system faults
When the unit fails and halts, first check the two-digit nixie tube of the control board and fault table to find
out the specific fault. Then check and solve the fault according to the following methods.
(1) Communication failure between the compressor's drive board and control board (outdoor fault C2)
Check if the control board and
compressor's drive board are powered.
Check if the control board and compressor's
drive board are well connected to each other
using the communication cable.
Check the dial switch of the
compressor's drive board is
The compressor's drive board is
faulty and needs to be replaced.
GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
C2
Yes
Yes
correct.
Yes
Is the fault solved?
No
Complete
If the LED of the control board is off, replace the
No
control board; if the LED of the drive board is off,
If not, reconnect them. If the cable is not
No
No
Adjust the drive board's dial .switch as required.
163
replace the drive board.
conducting, replace the cable.