Gree GMV5E Series Service Manual page 147

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