Gree GMV-120WM/B-F

GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
166
2.2.1.2 System faults
(1) System exhaust temperature exception
Faul
t
code
Fault
Possible reasons
Solution
Primary reason
Secondary reason
Tertiary reason
Descriptio
n
Confirmatio
n method
Descriptio
n
Confirmatio
n method
Descriptio
n
Confirmatio
n method
E4
High
exhaust
temperatur
e protection
1. The stop
valve of
the ODU is
not fully
opened as
required.
——
——
——
——
Manual
check
Fully
open the
stop
valve.
2. The
IDU's
electronic
expansion
valve is not
working
properly.
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
（27℉）
higher than
the intake
temperature
; when the
IDU is
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
（18℉）
higher than
the intake
temperature
;
2.1 The
controlling
of
electronic
expansion
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.
Manual
check
Connect
the
electronic
expansio
n valve's
control
wire to
the main
board.
2.1.2 The
control
wire that
connects
the
electronic
expansion
valve to
the main
board is
broken.
Manual
check
Repair or
replace
the
control
wire of
the
electronic
expansio
n valve.
2.2 The
electronic
expansion
valve in
the mode
switcher is
faulty.
Other
reasons
2.2.1
Affected by
impurities
in the
system
——
Clean the
system
and clear
the
impurities
. Replace
the body
of the
electronic
expansio
n valve.
2.2.2 The
valve body
is faulty.
——
Replace
the body
of the
electronic
expansio
n valve.