PACD011001C2 Troubleshooting
Troubleshooting Urban Multi “MX1R, ME1R Series” Using R-407C 361
3.18 Outdoor Unit: Abnormal Discharge Pipe Temperature
Remote Controller
Display
F3
F3F3
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
∗
1 Refer to Thermistor Resistance / Temperature Characteristics on P585
Note:
(VF044)
Discharge pipe
temperature is 135˚C
or higher.
Is there a wrong
connection of the injection
solenoid valves Y3S
and Y4S?
Is there a
wrong connection
of the discharge pipe
thermistor?
R3T or R3-1T (inverter side),
R3-2T (standard
side)
Are the
characteristics of the
discharge pipe thermistor
normal? R3T or R3-1T,
R3-2T
(See ∗1)
Replace outdoor unit PC board A1P.
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.
CU-5 CU-8·10
R3T R3-1T (inverter) R3-2T (standard)
MX1R X17A X17A X18A
ME1R — X16A X17A
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