GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
141
Fault
code
Fault
Possible reasons
Solution
Primary reason
Secondary reason
Tertiary reason
Description
Confirmation
method
Description
Confirmation
method
Description
Confirmation
method
E3
Low-pressure
Protection
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.
The system's
exhaust
pressure rises
and the low
pressure is too
low (compared
with the
reference
value).
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
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.
2.4.1 The
block is
caused by
solder.
Cut off the
pipe and
check it.
Replace and solder
the pipe.
2.4.2 The
pipeline is
blocked by
impurities.
Replace and solder
the pipe.
3. The
ambient
temperature
is too low.
——
3.1 The
outdoor
ambient
temperature
is lower
than -25°C
in the
heating
mode.
Measure the
outdoor ambient
temperature.
——
——
It is a normal
phenomenon caused
by the protection
function.
4. The
pressure
sensor is
faulty.
——
4.1 The low
pressure
sensor is
faulty.
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
——
——
Replace the high
pressure sensor.
