Gree GMV-560WM/B-X - Page 321

GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
318
8. Troubleshooting
8.1 Hardware Faults
Table 6. Hardware faults
Symptom
Possible Cause
Troubleshooting
A software communication
fault alarm is reported, and
some or all units' running
state is not displayed or
cannot be controlled.
The communications lines
are not twisted pairs.
Replace the communication
lines with twisted pairs.
Gateway damages.
Replace the damaged
gateway.
Communication lines
interrupt.
Weld the interrupted lines.
Communication lines are
short circuited.
Repair the short circuited
part.
Twisted pairs are too close
to the power lines (less than
15 cm clearance), resulting
in disturbance that affects
communication.
Separate the two types of
lines. If their clearance is
less than 15 cm, cover them
with sheath separately.
Communication interface
connection error
Refer to related instructions
to connect the
communication interfaces.
Though lines are normal,
a software communication
fault occurs and some or
all units' information is not
displayed.
ODUs, after being replaced
with chips or reset with DIP,
are not re-powered on.
Re-power on the ODUs.
The serial port configured
by the software is
inconsistent with that
connected to PCs.
Connect the PCs to the
serial port configured by the
software or change the serial
port setting in the software.
Units are not powered on.
Power on the units.
ODUs or IDUs are not
equipped with chips, or
chips are inversely installed.
Install the chips in a correct
direction and power on the
units.
Unit address is incorrect or
replicate.
Correct the incorrect
address settings.
Though lines and devices
are normal, information of
devices of a floor is not
displayed.
Maybe a repeater is
required. If such a device
has been installed, maybe
wiring is incorrect.
Reinstall the repeater in a
correct manner.
A communication fault alarm
is reported, all units' running
state is not displayed,
and the TX LED on the
converter is steadily on.
Polarities of communication
lines are not distinguished
or they are connected in a
wrong order.
Check communication lines
for their polarities and
connect them in a correct
order.
Lines, devices, and setups
are all normal. However, a
software communication
fault alarm is reported.
The display or controller
does not match units.
Check the models of the
controller and operation
panel. If they do not match
unit specification, replace
them.
8.2 Software Faults
8.2.1 Software Abnormalities
1. Though the username and password entered are correct, the system prompts ―Please contact the
administrator‖, as shown in the following figure: