GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
157
NOTE:
â‘ If the enquired IDU is normal, no fault code will be displayed in the temperature area; if the unit
indoor has multiple faults, fault codes will be displayed in the temperature area at an interval of 3
seconds.
② Press the ―ON/OFF‖ button on the interface of IDU project number and fault enquiry to exist the
parameter enquiry interface.
2.2 Exception Analyzing and Troubleshooting
2.2.1 Form analyzing
2.2.1.1 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.
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