Daikin ERSQ 011AAV1 Service Manual page 204

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