GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
187
(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 correct.
The compressor's drive
board is faulty and needs to
be replaced.
If the LED of the control board is off,
replace the control board; if the LED
of the drive board is off, replace the
drive board.
If not, reconnect them. If the cable is
not conducting, replace the cable.
Adjust the drive board's dial .switch
as required.
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