SiBE18-821_C Troubleshooting for Outdoor Unit
Troubleshooting 401
7.16 Low Pressure Sensor Abnormality
Remote
Controller
Display
JC
Method of
Malfunction
Detection
The pressure detected by low pressure sensor determines the error.
Malfunction
Decision
Conditions
When the low pressure sensor is short circuit or open circuit
Supposed
Causes
Defective low pressure sensor
Wrong connection with high pressure sensor
Defective main PCB (A1P)
Troubleshooting
∗
1: Voltage measurement point
∗
2: For pressure / voltage characteristics graph, refer to “Pressure Sensor” on page 429.
Is the
low pressure
sensor connected to
X18A (blue) on the
main PCB
(A1P)?
The
relationship
between the ∗1
VL and low pressure is
normal (see ∗2) when
voltage is measured
between the pins 2
and 3 of X18A
(see ∗1)?
Replace the low pressure
sensor.
(R13033)
Connect the low pressure
sensor and turn on again.
NO
Replace the main PCB
(A1P).
YES
YES
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Main PCB (A1P)
X18A (Blue)
Red
Black
Low pressure sensor
White
(R13034)
Measure the voltage here.
Microcomputer
A/D input
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