Gree GMV5 - Page 165

GREE Photovoltaic Direct-driven Inverter Multi VRF Units
161
Fault
code
Fault
Possible reasons
Solution
Primary reason Secondary reason Ter tiary reason
Description
Confirmation
method
Description Confirmation method Description
Confirmation
method
E3
Low-
pressure
Protection
4. The
pressure
sensor is faulty.
——
4.1 The low
pressure
sensor is faulty.
Stop the whole system. Test
the system's balance
pressure 20 minutes later
and convert the pressure
into the corresponding
saturation temperature.
Compare it with the outdoor
ambient temperature. If the
difference is larger than
5°C, it is exceptional.
—— ——
Replace the high
pressure sensor.
4.2 The high
pressure and
low pressure
sensors are
connected
reversely.
Connect the stop valves of
the module high- and
low-pressure air pipes to
the high and low pressure
gauges and transform the
readings into corresponding
temperatures. Compare
them to the high- and
low-temperatures tested by
the system. If the difference
is larger than 5°C, it is
exceptional.
—— ——
Reconnect the
high- and
low-pressure
sensors.
6. The fan is
not working
properly.
A. The IDU's fan
does not work in
the cooling
mode. B. The
ODU's fan does
not work in the
heating mode.
6.1 The IDU's
fan is faulty.
Manual check
6.1.1 The power
cable connecting the
motor and main
board is loose.
Manual check
Reconnect the
motor with the
power cable.
6.1.2 The electric
capacity is not
connected or is
damaged.
Manual check
Connect or
replace the
electric capacity.
6.1.3 The motor is
damaged.
Other reasons
Replace the
motor.
6.2 The ODU's
fan is faulty.
Manual check
6.2.1 The fan motor
is not properly
connected with the
control board of the
motor.
Manual check
Reconnect it
properly.
6.2.2 The fan motor
is not properly
connected with the
control board of the
motor with the
communication
feedback cable.
Manual check
Reconnect it
properly.
6.2.3 The control
board of the fan's
motor is damaged.
Manual check
Replace the
control board of
the motor.
6.2.4 The main
board of the fan's
motor is damaged.
Other reasons
Replace the
motor.
7. Not enough
refrigerant
Other reasons
Incorrect
quantity of
refrigerant is
injected.
—— —— ——
Check the
necessary
amount of
refrigerant and
inject refrigerant
slowly via the
stop valve of the
low-pressure air
pipe.