Gree GMV5 Series Service Manual page 140

Fault
Fault
code
Descriptio
stop valve
ODU is
not fully
opened as
required.
High
exhaust
electronic
temperat
E4
expansion
ure
valve is
protectio
n
working
properly.
system
pipeline is
blocked.
GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
Primary reason
Confirmatio
n n method
1. The
of the
——
When the
IDU is
working in
the cooling
mode and
the
electronic
expansion
valve is
opened to
2000PLS,
the exhaust
temperature
of the IDU's
coil is more
than 15° C
2. The
higher than
IDU's
the intake
temperature
; when the
IDU is
not
working in
the heating
mode and
the
electronic
expansion
valve is
opened to
2000PLS,
the intake
temperature
of the IDU's
coil is more
than 10° C
higher than
the intake
temperature
;
The
3. The system's
exhaust
temperature
rises and
the low
Possible reasons
Secondary reason
Descriptio Confirmati
n on method
—— ——
Reset the
IDU.
2.1 The Listen to
controlling the sound
of and touch
electronic the tube to
expansion see if the
valve by electronic
main expansion
board of valve is
indoor unit reset.
is If it is set, it
abnormal. is normal.
Otherwise,
it is faulty.
2.2 The
electronic
expansion
Other
valve in
reasons
the mode
switcher is
faulty.
Touch the
3.1 The pipe along
fluid pipe the flowing
is direction of
blocked. refrigerant
to feel the
137
Tertiary reason
Descripti Confirmati
on on method
Manual
——
check
2.1.1 The
control
wire of
the
electronic
expansio Manual
n valve is check
not
connecte
d to the
main
board.
2.1.2 The
control
wire that
connects
the
Manual
electronic
check
expansio
n valve to
the main
board is
broken.
2.2.1
Affected
by
——
impurities
in the
system
2.2.2 The
valve
——
body is
faulty.
—— ——
Solution
Fully open
the stop
valve.
Connect
the
electronic
expansion
valve's
control
wire to the
main
board.
Repair or
replace the
control
wire of the
electronic
expansion
valve.
Clean the
system
and clear
the
impurities.
Replace
the body of
the
electronic
expansion
valve.
Replace
the body of
the
electronic
expansion
valve.
Replace
and solder
the pipe.