Outdoor Unit: Abnormal Discharge Pipe Temperature - Panasonic Urban Multi MX1R Series Service Manual

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