Gree GMV-120WM/B-F

GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
169
Fault
code
Fault
Possible reasons
Solution
Primary reason
Secondary reason
Tertiary reason
Description
Confirmation
method
Description
Confirmation
method
Description
Confirmation
method
E2
Low
exhaust
temperature
protection
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
corresponding
liquid-air
separator is
more than
1°C （1.8℉）
lower than the
low-pressure
saturation
temperature
and the
difference
between the
compressor's
exhaust
temperature
or cover
temperature
and the
high-pressure
temperature
is smaller
than 10°C（18
℉）.
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
expansion
valve is not
connected
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
expansion
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.
1.3.2 The
body of the
valve is
faulty.
——
Replace
the body
of the
electronic
expansion
valve.