Gree GMV-Pdm450W/NaB-M

162
DC Inverter Multi
VRF Service Manual
S/N Class Trouble
Possible Cause
Troubleshooting
First-level reason Second-level reason Third-level reason
Description
of Cause
Method of
Conrmation
Description of Cause Method of Conrmation
Description
of Cause
Method of
Conrmation
7
Abnormal
system
pressure
Discharge
pressure
abnormally
increases.
3.The abmbient
temp is too high
when the unit
is running
——
3.1 Outdoor ambient
temp is more than
48
when cooling
operation.
Collect outdoor ambient
temp on spot.
—— —— Normal phenomenon.
8
3.2 Heating operation,
actual temp of return
air of the indoor
unit exceeds 30
.
Collect return air temp on spot. —— —— Normal phenomenon.
9
4. Pressure
transducer is
abnormal.
——
4.1 Inspection of high
pressure transducer
is abnormal.
Stop the complete unit and check
the equalizing pressure of high and
low pressures after 20 min. Then,
transfer the pressure value to the
corresponding saturation temp and
compare it with outdoor ambient
temp. If the temp difference is
more than 5 it is abnormal.
—— ——
Replace high
pressure transducer
10
4.2 High pressure
transducer and low
pressure transducer are
wrongly connected.
When the system is running, check
the high pressure of gas pipe
and liquid pipe. Then, transfer
them to the corresponding temp
value which shall be respectively
compared with the corresponding
temp value detected by system.
If the temp difference is greater
than 5 there is abnormality.
—— ——
Exchange these two
pressure transducers.
11
5. High pressure
switch abnormally
operates.
“E1”code will be
displayed after
energization
of the unit.
5.1 The connection
between high pressure
switch and mainboard
is abnormal.
——
5.1.1 Pressure
switch is not
connected with
mainboard.
—— Connect them again.
12 ——
5.1.2 Connecting
wire between
pressure switch
and mainboard
is abnormal.
——
Replace the
connecting wire.
13
5.2High pressure
switch is damaged.
—— —— ——
Replace pressure
switch.