Gree GC201808-III, Service Manual

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GREE GMV5 HR HEAT RECOVERY UNITS
187
Fault
code
Fault
Possible reasons
Solution
Primary reason Secondary reason Tertiary reason
Description
Confirmation
method
Description
Confirmation
method
Description
Confirmation
method
E3
Low-pressure
Protection
1. The stop
valve of the
ODU is not
fully
opened as
required.
—— —— —— ——
Manual
check Fully open the
stop valve.
2. The
system
pipeline is
blocked.
The system's
exhaust
pressure
rises and the
low pressure
is too low
(compared
with the
reference
value).
2.1. The
system air
pipeline is
blocked.
Touch the pipe
along the
flowing direction
of refrigerant to
feel the
temperature
difference. The
difference is
large. 2.1.1 The
block is
caused by
solder.
Cut off the
pipe and
check it.
Replace and
solder the pipe.
2.1.2 The
pipeline is
blocked by
impurities.
Replace and
solder the pipe.
2.2 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.
2.4 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. 2.4.1 The
block is
caused by
solder.
Cut off the
pipe and
check it.
Replace and
solder the pipe.
2.4.2 The
pipeline is
blocked by
impurities.
Replace and
solder the pipe.
3. The
ambient
temperature
is too low.
——
3.1 The
outdoor
ambient
temperature
is lower
than -25°C
in the
heating
mode.
Measure the
outdoor ambient
temperature.
—— ——
It is a normal
phenomenon
caused by the
protection
function.