Gree GMV-400WM/B-X - Page 142

GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
139
larger than
5°C , it is
exceptional.
6.
Exhaust
temperatu
re sensor
failure
——
——
——
Replace
the
temperatur
e sensor or
main
board.
7. The
ambient
temperatu
re
exceeds
the scope
of
temperatu
re
required
for safe
operation.
——
The
outdoor
ambient
temperatu
re
exceeds
50°C .
Measure
the
ambient
temperatur
e.
——
——
It is a
normal
phenomen
on caused
by the
protection
function.
E2
Low
exhaust
temperat
ure
protectio
n
1. The
ODU's
electronic
expansion
valve is
not
working
properly.
When the
system is
working
in the
heating
mode and
the ODU's
electronic
expansion
valve is
opened to
100PLS,
the intake
temperature
of the
correspondi
ng liquid-air
separator is
more than
1°C lower
than the
low-pressur
e saturation
temperature
and the
difference
between the
compressor'
s exhaust
temperature
or cover
temperature
and the
high-pressu
1.2 The
controlling
heating
electronic
expansion
of the
main
board or
the
electronic
expansion
valve of
the
subcooler
is faulty.
Reset the
ODU.
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.
1.2.1 The
control
wire of
the
electronic
expansio
n valve is
not
connecte
d to the
main
board.
Manual
check
Connect
the
electronic
expansion
valve's
control
wire to the
main
board.
1.2.2 The
control
wire that
connects
the
electronic
expansio
n valve to
the main
board is
broken.
Manual
check
Repair or
replace the
control
wire of the
electronic
expansion
valve.
1.3 The
body of
the
electronic
expansion
valve is
not
working
properly.
Other
reasons
1.3.1
Affected
by
impurities
in the
system
——
Clean the
system
and clear
the
impurities.
Replace
the body of
the
electronic
expansion
valve.