Flowchart Analysis; High Exhaust Temperature Protection - Gree GMV-S120WL/A-S Service Manual

4.2Flowchart analysis

4.2.1 High exhaust temperature protection (E4)
When the system appears high exhaust temperature protection for compressor, the IDU will
display high exhaust temperature fault E4, while the IDU will display the specific faulty compressor.
For example, when high exhaust temperature protection is enabled on compressor 2# of module
3# of the ODU, IDUs will display E4 and the module will display E6, indicating that high exhaust
temperature protection is enabled on compressor 2#.
GMV5 Home DC Inverter Multi VRF Units
4.Poor
airflow
distributi
on
design
7.Not
enough Other
refrigera reasons
nt
3.4-7The
outdoor
Measure
ambient
the
temperat
outdoor
ure in the
ambient
heating
temperat
mode is
ure.
lower
than -7C.
4.1The
air intake
and
return
inlet of
the ODU
are too
Check
close to
the
each
distance.
other,
affecting
the heat
exchange
performa
nce of the
unit.
4.2The
air intake
and
return
inlet of
the IDU
are too Check
close to the
each distance.
other,
causing
poor heat
exchange
of the
unit.
Incorrect
quantity
of
refrigeran
t is
injected.
287
It is a
normal
phenomen
on.
Re-design
the airflow
distributio
n.
Re-design
the airflow
distributio
n.
Check the
necessary
amount of
refrigerant
and inject
refrigerant
slowly via
the stop
valve of
the
low-press
ure air
pipe.