Troubleshooting by Indication on the Remote Controller SiUS39-602
164 Troubleshooting
2.33
“
JC
”
Outdoor Unit: Malfunction of Suction Pipe Pressure
Sensor
Remote Controller
Display
JC
Applicable Models REYQ72M, 96M
Method of
Malfunction
Detection
Malfunction is detected from pressure detected by low pressure sensor.
Malfunction
Decision
Conditions
When the suction pipe pressure sensor is short circuit or open circuit.
Supposed
Causes
Defect of low pressure sensor system
Connection of high pressure sensor with wrong connection.
Defect of outdoor unit PC board.
Troubleshooting
∗
1: Voltage measurement point
∗
2: Refer to pressure sensor, pressure/voltage characteristics table on P.241.
(V2808)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
The
relationship
between the ∗1
VH and low pressure is
normal (see ∗2) when voltage
is measured between X45A pins
(2) and (3) of outdoor unit
PC board (A1P)
(see ∗1).
Replace the low pressure sensor.
Connect low pressure sensor
property and restart system.
NO
NO
Replace outdoor unit PC board
(A1P).
YES
YES
The low
pressure sensor is
connected to X45A (blue)
of outdoor unit PC
board (A1P).
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