Analysis In Forms; Control; Troubleshooting - Gree GMV-S120WL/A-S Service Manual

4. Troubleshooting

4.1 Analysis in Forms

4.1.1 Control

Fault
Fault
code
Faults in the ODU's
main board (such as
F0 memory and
address chip
exceptions)
Faults in the
constant frequency
FC
compressors current
sensor
Wrong outdoor
U2
capacity code setting
Power phase
U3
sequency protection
Wrong emergency
UL
operation dial code
C0
GMV5 Home DC Inverter Multi VRF Units
Possible causes
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 The constant
frequency
compressor is not
1 If the compressor is not started, check if the AC contact is
started.
2 The current
detection bord is
faulty.
3 The main boards
detection circuit is
faulty.
1 The capacity code
is wrong.
2 The dial
component is faulty.
1 The three phase
power cable is not
connected correctly.
2 The main boards
detection circuit is
faulty.
1 The dial setting is
wrong.
2 The dial
component is faulty.
1. The
265
Solution
1 Replace the small CPU board
2 Replace the control board.
3 Replace the control board.
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.
1 Modify the capacity code setting.
2 Replace the main board.
1 Check connection of the power cable.
2 Replace the control board.
1 Modify the dial setting.
2 Replace the main board.
If C0 is not displayed on the control board of the ODU,