Gree GMV-120WM/B-F Service Manual

GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
174
Fa
ult
co
de
Fault
Possible reasons
Solution
Primary reason
Secondary reason
Tertiary reason
Description
Confir
mation
metho
d
Description
Confirmation method
Description
Confirm
ation
method
E3
Low-p
ressu
re
Prote
ction
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
syste
m's
exhau
st
pressu
re
rises
and
the
low
pressu
re is
too
low
(comp
ared
with
the
refere
nce
value).
2.1. The
system gas
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（-13℉）
in the heating
mode.
Measure the outdoor
ambient temperature.
——
——
It is a
normal
phenome
non
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 （9℉）, it is
exceptional.
——
——
Replace
the high
pressure
sensor.

Gree GMV-120WM/B-F Specifications

General

Brand	Gree
Model	GMV-120WM/B-F
Category	Inverter
Language	English