GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
129
Part 2 Exception and Troubleshooting
Exception Analyzing and Troubleshooting
(1) Form analyzing
1. Control
Faults in the ODU's
main board (such as
memory and
address chip
exceptions)
1. The clock chip on the main board
is damaged.
2. The memory chip on the main
board is damaged.
3. The address chip on the main
board is damaged.
1. Replace the small CPU board.
2. Replace the control board.
3. Replace the control board.
Faults in the
constant frequency
compressor's
current sensor
1. The constant-frequency
compressor is not started.
2. The current detection board is
faulty.
3. The main board's detection
circuit is faulty.
1. If the compressor is not started, check if the AC
contact is closed. If not, replace the AC contact.
If the connection is loose, reconnect it;
2. Replace the current detection board.
3. Replace the main board.
Wrong outdoor
capacity code
setting
1. The capacity code is wrong.
2. The dial component is faulty.
1. Modify the capacity code setting.
2. Replace the main board.
Power phase
sequence protection
1. The three-phase power cable is
not connected correctly.
2. The main board's detection
circuit is faulty.
1. Check connection of the power cable.
2. Replace the control board.
Wrong emergency
operation dial code
1. The dial setting is wrong.
2. The dial component is faulty.
1. Modify the dial setting.
2. Replace the main board.
Communication
failure between
indoor and ODUs
and IDU's
communicator
1. The communication cable is not
connected.
2. The communicator is
disconnected.
3. The communication cable is
poorly connected.
4. The communicator controller is
faulty.
If C0 is not displayed on the control board of the
ODU, check the network between the IDU and
communicator. If C0 is displayed, check the network
between the IDUs and ODUs and between the IDU
and communicator as follows:
1) Check if the cables connecting the control board of
the ODU and the IDU and connecting the IDU and
communicator are loose. If yes, reconnect them;
2) Check if the cables connecting the control board
and IDU and connecting the IDU and
communicator are broken. If yes, replace the
cables;
3) Check the contact of the communication cables;
4) Replace the control board. If the fault is solved, the
control board is faulty. Replace the IDU. If the fault
is solved, the IDU is faulty.
Communication
failure between
main control board
and inverter
compressor drive
1. The communication cable is not
connected.
2. The communicator is
disconnected.
3. The communication cable is
poorly connected.
4. The communicator is faulty.
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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