Panasonic CU-8ME1XPK - Outdoor Unit: Abnormal Discharge Pipe Temperature

PACD011001C2 Troubleshooting
Troubleshooting UM Combination “MA1R Series” Using R-407C 515
3.18 Outdoor Unit: Abnormal Discharge Pipe Temperature
Remote Controller
Display
F3
Supposed Causes
„
Abnormal discharge pipe temperature
„
Defect of discharge pipe thermistor (CU-5: R3T CU-8, 10: R3-1T, R3-2T)
„
Defect of outdoor unit PC board
„
Discharge pipe thermistor wrong connection
„
Liquid injection solenoid valve wrong connection
Troubleshooting
(VF044)
Discharge pipe
temperature is 135˚C
or higher.
Is there
a wrong connection of the
injection solenoid valves
Y3S, Y4S and Y5S?
Is there
a wrong
connection of the
discharge pipe thermistor?
R3-1(11)T (inverter side)
X16A, R3-2(12)T (standard
side) X17A and R3-13T
(standard side)
X21A for 24~30
class.
Are
the characteristics
of the discharge pipe
thermistor normal?
(R3-1T, R3-2T or
R3-11T~13T) (For the
characteristics
table.)
Replace outdoor unit PC board A1P.
(or A3P for 24~30 class)
Connect correctly and turn on again.
Replace the discharge pipe thermistor.
NO
NO
NO
NO
Refrigerant shortage, compressor
defect, etc. Defect of the refrigerant
system.
YES
YES
YES
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.