Gree GMV5 Series, Service Manual

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GREE Photovoltaic Direct-driven Inverter Multi VRF Units
157
Fault
code
Fault
Possible reasons
Solution
Primary reason Secondary reason Tertiary reason
Description
Confirmation
method
Description
Confirmation
method
Description Confirmati
on method
E2
Low exhaust
temperature
protection
1. The
ODU's
electronic
expansion
valve is not
working
properly.
When the system is
working
in the heating mode
and the ODU's
electronic
expansion valve is
opened to 100PLS,
the intake
temperature of the
corresponding
liquid-air separator
is more than 1°C
lower than the
low-pressure
saturation
temperature and
the difference
between the
compressor's
exhaust
temperature or
cover temperature
and the
high-pressure
temperature is
smaller than 10°C.
1.2 The
controlling
heating
electronic
expansion
of the main
board or the
electronic
expansion
valve of the
subcooler is
faulty.
Reset the ODU.
Listen to the
sound and touch
the tube to see if
the electronic
expansion valve
is reset.
If it is set,
it is normal.
Otherwise,
it is faulty.
1.2.1 The
control wire of
the electronic
expansion
valve is not
connected to
the main
board.
Manual
check
Connect the
electronic
expansion valve's
control wire to the
main board.
1.2.2 The
control wire
that connects
the electronic
expansion
valve to the
main board is
broken.
Manual
check
Repair or replace
the control wire of
the electronic
expansion valve.
1.3 The body
of the
electronic
expansion
valve is not
working
properly.
Other reasons
1.3.1 Affected
by impurities
in the system
——
Clean the system
and clear the
impurities.
Replace the body
of the electronic
expansion valve.
1.3.2 The
body of the
valve is faulty.
——
Replace the body
of the electronic
expansion valve.
2. The
IDU's
electronic
expansion
valve is not
working
properly
When the system is
working
in the cooling mode
and the ODU's
electronic
expansion valve is
opened
to 200PLS, the
exhaust
temperature of the
IDU's coil is more
than 1°C lower than
the intake pipe's
temperature and
the difference
between
the compressor's
exhaust
temperature or
cover temperature
and the
high-pressure
temperature
is smaller than
10°C.
2.1 The
controlling of
electronic
expansion
valve by main
board of
indoor unit is
abnormal.
Reset the IDU.
Listen to the
sound and touch
the tube to see if
the electronic
expansion valve
is reset.
If it is set,
it is normal.
Otherwise,
it is faulty.
2.1.1 The
control wire of
the electronic
expansion
valve is not
connected to
the main
board.
Manual
check
Connect the
electronic
expansion valve's
control wire to the
main board.
2.1.2 The
control wire
that
connecting
the electronic
expansion
valve to the
main board is
broken.
Manual
check
Repair or replace
the control wire of
the electronic
expansion valve.
2.2 The body
of the
electronic
expansion
valve is not
working
properly.
Other reasons
2.2.1 Affected
by impurities
in the system
——
Clean the system
and clear the
impurities.
Replace the body
of the electronic
expansion valve.
2.2.2 The
valve body is
faulty.
——
Replace the body
of the electronic
expansion valve.
3. Exhaust
temperatur
e sensor
failure
—— —— —— —— ——
Replace the
temperature
sensor or main
board.
4. Too
much
refrigerant
Other reasons
Incorrect
quantity of
refrigerant is
injected.
—— —— ——
Check the
necessary amount
of refrigerant
and discharge the
unneeded
refrigerant slowly
via the stop valve
of the fluid pipe.