Gree GMV-120WM/B-F

GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
170
Fa
ult
co
de
Fault
Possible reasons
Solution
Primary reason
Secondary reason
Tertiary reason
Descripti
on
Confirmation
method
Descriptio
n
Confirmation
method
Description
Confi
rmati
on
meth
od
E2
Low
exha
ust
temp
eratu
re
prote
ction
2. The
IDU's
electroni
c
expansi
on valve
is not
working
properly
When the system
is working
in the cooling
mode and the
ODU's electronic
expansion valve
is opened
to 200PLS, the
exhaust
temperature of
the IDU's coil is
more than 1°C °
（1.8℉） lower
than the intake
pipe's
temperature and
the difference
between
the compressor's
exhaust
temperature or
cover
temperature and
the
high-pressure
temperature
is smaller than
10°C （18℉）.
2.1 The
controllin
g of
electronic
expansio
n valve by
main
board of
indoor
unit is
abnormal.
Reset the
IDU. Listen
to the sound
and touch
the tube to
see if the
electronic
expansion
valve is
reset.
If it is set,
it is normal.
Otherwise,
it is faulty.
2.1.1 The
control wire of
the electronic
expansion valve
is not connected
to the main
board.
Manu
al
chec
k
Connect the
electronic
expansion valve's
control wire to the
main board.
2.1.2 The
control wire that
connecting
the electronic
expansion valve
to the main
board is broken.
Manu
al
chec
k
Repair or replace
the control wire of
the electronic
expansion valve.
2.2 The
body of
the
electronic
expansio
n valve is
not
working
properly.
Other
reasons
2.2.1 Affected
by impurities in
the system
——
Clean the system
and clear the
impurities.
Replace the body
of the electronic
expansion valve.
2.2.2 The valve
body is faulty.
——
Replace the body
of the electronic
expansion valve.
3.
Exhaust
temperat
ure
sensor
failure
——
——
——
——
——
Replace the
temperature
sensor or main
board.
4. Too
much
refrigera
nt
Other reasons
Incorrect
quantity
of
refrigeran
t is
injected.
——
——
——
Check the
necessary amount
of refrigerant
and discharge the
unneeded
refrigerant slowly
via the stop valve
of the fluid pipe.