Gree GC201808-III, Service Manual

Page: 184 / 362

GREE GMV5 HR HEAT RECOVERY UNITS
180
Fault
code
Fault
Possible reasons
Solution
Primary reason Secondary reason Tertiary reason
Description
Confirmation
method
Description
Confirmation
method
Description
Confirmation
method
more than
10°C higher
than the intake
temperature;
2.2.2 The
valve body is
faulty.
——
Replace the
body of the
electronic
expansion
valve.
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.