PACD011001C2 Troubleshooting
Troubleshooting Urban Multi “MX1, ME1 Series” Using R-22 171
3.16 Outdoor Unit: Actuation of Low Pressure Switch
Remote Controller
Display
E4
E4E4
E4
Supposed Causes
„
Abnormal drop of low pressure (0 kg/cm² [0 MPa])
„
Defect of low pressure sensor
„
Defect of outdoor unit PC board
Troubleshooting
∗
1: Voltage measurement point
∗
2: Refer to pressure sensor, pressure - voltage characteristics table on P587.
(VF042)
Low pressure
at stop due to malfunction is
0.0 kg / cm
2
.
Measure
the voltage (VL)
of X21A pin No. (2) - (3)
of outdoor PC board (A1P). ∗1
Is the relationship
between low voltage
and VL
normal?
Refrigerant shortage, refrigerant
system clogging, wiring and piping
wrong connection.
Replace the low pressure sensor.
Replace outdoor unit PC board A1P.
NO
NO
YES
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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