GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
143
Fault
code
Fault
Possible reasons
Solution
Primary reason
Secondary reason
Tertiary reason
Description
Confirmation
method
Description
Confirmation
method
Description
Confirmation
method
feedback
cable.
6.2.3 The
control
board of the
fan's motor
is damaged.
Manual check
Replace the control
board of the motor.
6.2.4 The
main board
of the fan's
motor is
damaged.
Other
reasons
Replace the motor.
7. Not
enough
refrigerant
Other reasons
Incorrect
quantity of
refrigerant
is injected.
——
——
——
Check the necessary
amount of refrigerant
and inject refrigerant
slowly via the stop
valve of the
low-pressure air pipe.
2.2.3 Poor cooling/heating performance
Feedback
from user
Exception
Possible reasons
Solution
Primary reason
Secondary reason
Tertiary reason
Description
Confirmation
method
Description
Confirmation
method
Description
Confirmation
method
Poor heating
/cooling
performance
A. When the
IDU is working
in the cooling
mode and the
electronic
expansion
valve is opened
to the max., the
exhaust
temperature of
the IDU's coil is
more than 5°C
higher than the
intake
temperature; B.
when the IDU is
working in the
heating mode
and the
electronic
expansion
valve is opened
to 2PLS, the
intake
temperature of
the IDU's coil is
more than 12°C
lower than the
saturation
temperature
corresponding
1. The stop
valve of the
ODU is not
fully opened
as required.
——
——
——
——
Manual check
Fully open the
stop valve.
2. The
system
pipeline is
blocked.
——
2.1. The
system air
pipeline is
blocked.
Touch the pipe
along the
flowing
direction of
refrigerant to
feel the
temperature
difference. The
difference is
large.
2.1.1 The
block is
caused by
solder.
Cut off the
pipe and
check it.
Replace and
solder the pipe.
2.1.2 The
pipeline is
blocked by
impurities.
Replace and
solder the pipe.
2.2 The fluid
pipe is
blocked.
Touch the pipe
along the
flowing
direction of
refrigerant to
feel the
temperature
difference. The
difference is
large or part of
the pipe is
frosting.
——
——
Replace and
solder the pipe.
2.4 The
pipe that
connects
the IDU is
Touch the pipe
along the
flowing
direction of
2.4.1 The
block is
caused by
solder.
Cut off the
pipe and
check it.
Replace and
solder the pipe.
