Specifications

Troubleshooting by Indication on the Remote Controller SiBE28-805
174 Troubleshooting
3.29
“
JC
”
Outdoor Unit: Malfunction of Low Pressure Sensor
Remote
Controller
Display
JC
Applicable
Models
CMSQ200A7, 250A7
Method of
Malfunction
Detection
Malfunction is detected from pressure detected by low pressure sensor.
Malfunction
Decision
Conditions
When the low 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.249.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
The
relationship
between the ∗1
VL and low pressure
is normal (see ∗2) when
voltage is measured between
X31A 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 X31A of outdoor
unit PC board
(A1P).