Troubleshooting for Outdoor Unit SiBE18-821_C
400 Troubleshooting
7.15 High Pressure Sensor Abnormality
Remote
Controller
Display
JA
Method of
Malfunction
Detection
The pressure detected by high pressure sensor determines the error.
Malfunction
Decision
Conditions
When the high pressure sensor is short circuit or open circuit
Supposed
Causes
Defective high pressure sensor
Wrong connection with low 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 high
pressure sensor
connected to X17A (red) on
the main PCB
(A1P)?
The
relationship
between the ∗1
VH and high pressure
is normal (see ∗2) when
voltage is measured
between the pins 1
and 3 of X17A.
(see ∗1)?
Replace the high pressure
sensor.
(R13031)
Connect the high 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)
X17A (Red)
Red
Black
High pressure sensor
White
(R13032)
Measure the voltage here.
Microcomputer
A/D input
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