ESIE09-08B Troubleshooting by Indication on the Remote Controller
Troubleshooting 177
3.36 “JC ” Indoor Unit: Malfunction of Low Pressure Sensor
Remote Control
Display
JC
Subcode 16
Applicable
Models
All indoor units
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
Connection of high pressure sensor with wrong connection
Defect of indoor unit PC board (A4P)
Troubleshooting
1: Voltage measurement point
2: Refer to “Pressure Sensor”, pressure/voltage characteristics table on P242.
Caution
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
The
relationship
between the *1VL
and low pressure is
normal (see *2) when voltage is
measured between X18A pins
(2) and (3) indoor unit
PC board (A4P)
(see *1).
Replace the low pressure sensor.
Connect low pressure sensor
property and restart system.
Bad wire connection
value < 0.1 bar
instantly
Faulty sensor
value < 18 bar
over 12 minutes
NO
NO
Replace indoor unit PC board
(A4P).
YES
YES
The low
pressure sensor is
connected to X18A (blue) of
indoor unit PC board
(A4P).
4
3
2
1
(V2809)
Re d
Black
Whit e
GND
*2 Measure voltage here.
Low pressure sensor
Indoor unit PC board A4P
+5V
X18A
Microcomputer
A/D input
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