Daikin ERSQ 011AAV1, Service Manual

Page: 204 / 262

Troubleshooting by Indication on the Remote Controller ESIE09-08
192 Troubleshooting
Troubleshooting
∗
2: Voltage measurement point
∗ 1: Refer to “Thermistor Resistance / Temperature Characteristics” table on P229.
∗
2: Refer to “Pressure Sensor, Pressure / Voltage Characteristics” table on P232.
(V2819)
The suction
pipe1 temp. minus
low pressure saturation temp.
is 20 °C or higher.
Resistance is
normal when
measured with the
thermistor (R3T) for suction
pipe1 disconnected from
the outdoor unit PC
board.
*
1
Out of gas or refrigerant system
is clogged. Requires check of
refrigerant system.
Replace the thermistor. (R3T)
Replace the outdoor unit PC
board (A1P).
YES
YES
NO
NO
Out of gas, closing of stop valve
or refrigerant system is clogged.
Requires check of refrigerant
system.
Replace main outdoor unit PC
board (A1P).
YES
YES
Is
the low pressure
sensor correct?
Replace the low pressure
sensor.
NO
NO
Cooling
Low
pressure is 0.25
MPa or less.
The
voltage of
X18A pins (2) and
(3) on main outdoor unit
PC board (A1P) is 1.0 VDC or
less. (Low pressure sensor
output voltage)
*
2
NO
NO
YES
YES
Replace low pressure sensor.
Caution
Be sure to turn off power switch before connect or disconnect connector, or
parts damage may be occurred.
4
3
2
1
(V2809)
Red
Black
White
GND
*2 Measure voltage here.
Lo
w pressure sensor
Outside unit PC board A1P
+5V
X18A
Microcomputer
A/D input