Service manual

Troubleshooting by Indication on the Remote Controller ESIE09-08A
186 Troubleshooting
3.35 “JC ” Outdoor Unit: Malfunction of Low Pressure Sensor
Remote Control
Display
JC
Applicable Models ER*Q 011~016*
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 outdoor unit PC board
Troubleshooting
1: Voltage measurement point
2: Refer to “Pressure Sensor”, pressure/voltage characteristics table on P254.
(V280
8)
Caution
Be sure to turn off power switch before connecting or disconnecting connector,
otherwise parts may be damaged.
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 X18A (blue) of
outdoor unit PC board
(A1P).
4
3
2
1
(V2809)
Red
Black
White
GND
*2 Measure voltage here.
Low pressure sensor
Outside unit PC board A1P
+5V
X18A
Microcomputer
A/D input