Gree GMV5E Series Service Manual page 145

GREE
Fault
Fault
code
Description
1. The stop
valve of the
ODU is not
fully opened
as required.
2. The
system
pipeline is
blocked.
Low-pressure
E3
Protection
3. The
ambient
temperature
is too low.
4. The
pressure
sensor is
faulty.
Primary reason
Confirmation
Description
method
—— ——
2.1. The
system air
pipeline is
blocked.
The system's
exhaust
pressure rises
2.2 The fluid
and the low
pipe is
pressure is too
blocked.
low (compared
with the
reference
value).
2.4 The
pipe that
connects
the IDU is
blocked.
3.1 The
outdoor
ambient
temperature
——
is lower
than -25° C
in the
heating
mode.
4.1 The low
pressure
——
sensor is
faulty.
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
Possible reasons
Secondary reason
Confirmation
Description
method
—— ——
Touch the pipe 2.1.1 The
along the flowing block is
caused by
direction of
refrigerant to feel solder.
the temperature
2.1.2 The
difference. The pipeline is
difference is
blocked by
large. impurities.
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.
Touch the pipe 2.4.1 The
along the flowing block is
direction of caused by
refrigerant to feel solder.
the temperature
2.4.2 The
difference. The
pipeline is
difference is large
blocked by
or part of the pipe
impurities.
is frosting.
Measure the
——
outdoor ambient
temperature.
Stop the whole
system. Test the
system's balance
pressure 20
minutes later and
convert the
pressure into the
corresponding
——
saturation
temperature.
Compare it with
the outdoor
ambient
temperature. If
the difference is
larger than 5° C, it
141
Tertiary reason
Confirmation
method
Fully open the stop
Manual check
valve.
Replace and solder
the pipe.
Cut off the
pipe and
check it.
Replace and solder
the pipe.
Replace and solder
——
the pipe.
Replace and solder
the pipe.
Cut off the
pipe and
check it.
Replace and solder
the pipe.
It is a normal
phenomenon caused
——
by the protection
function.
Replace the high
——
pressure sensor.
Solution