Gree GMV5 - Page 160

GREE Photovoltaic Direct-driven Inverter Multi VRF Units
156
Fault
code
Fault
Possible reasons
Solution
Primary reason Secondary reason Tertiary reason
Description
Confirmation
method
Description
Confirmation
method
Description
Confirmation
method
E4
High exhaust
temperature
protection
3. The system
pipeline is
blocked.
The system's
exhaust
temperature rises
and the low
pressure is too low
(compared with the
reference value).
3.1 The fluid
pipe is blocked.
Touch the pipe along
the flowing direction
of refrigerant to feel
the temperature
difference. The
difference is large or
part of the pipe is
frosting.
—— ——
Replace and solder
the pipe.
3.2 The air pipe
is blocked.
—— ——
Replace and solder
the pipe.
3.3 The pipe that
connects the
IDU is blocked.
Touch the
pipe along the
flowing direction of
refrigerant
to feel the
temperature
difference. The
difference is large or
part
of the pipe is frosting.
3.3.1 The block
is caused by
solder.
Cut off the
pipe to see if
it is blocked.
Replace and solder
the pipe.
3.3.2 The
pipeline is
blocked by
impurities.
Replace and solder
the pipe.
4. Lacking
refrigerant
The system's
exhaust
temperature rises
and the low
pressure is too low
(compared with the
reference value).
4.1 Not enough
refrigerant
—— —— ——
Inject refrigerant as
required.
4.2 Refrigerant
pipe leakage
Use the refrigerant
leak detector to
detect the leak along
the pipe.
—— ——
Stop the leak. Pump
out air and inject
refrigerant again.
5. Wrong
refrigerant is
injected.
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.
—— —— —— ——
Discharge existing
refrigerant
and inject
the correct refrigerant
as required.
6. Exhaust
temperature
sensor failure
—— ——
——
Replace the
temperature sensor
or main board.
7. The ambient
temperature
exceeds the
scope of
temperature
required for safe
operation.
——
The outdoor
ambient
temperature
exceeds 50°C.
Measure the
ambient
temperature.
—— ——
It is a normal
phenomenon caused
by the protection
function.