Jc" Outdoor Unit: Malfunction Of Low Pressure Sensor - Panasonic U-4..6ML5XPQ Service Manual

Panasonic
JC
3.33 " " Outdoor Unit:
JC
Remote
Controller
Display
Applicable U-4..6ML5DPQ, U-4..6ML5XPQ
Models
Method of Malfunction is detected from pressure detected by low pressure sensor.
Malfunction
Detection
Malfunction When the low pressure sensor is short circuit or open circuit.
Decision
Conditions
Supposed
Causes
Troubleshooting
∗
1: Voltage measurement point
∗
2: Refer to "Pressure Sensor", pressure/voltage characteristics table on P253.
Troubleshooting
Malfunction of Low Pressure Sensor
Defect of low pressure sensor
Connection of high pressure sensor with wrong connection.
Defect of outdoor unit PC board.
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
The low
pressure sensor is
connected to X18A (blue)
of outdoor unit PC
board (A1P).
YES
The
relationship
between the ∗1
VL and low pressure is
normal (see ∗2) when voltage
is measured between X18A pins
(2) and (3) of outdoor unit
PC board (A1P)
(see ∗1).
NO
Troubleshooting by Indication on the Remote Controller
NO
YES
Connect low pressure sensor
property and restart system.
Replace outdoor unit PC board
(A1P).
Replace the low pressure sensor.
(V2808)
181