Daikin Super Multi Plus E-Series - Page 400

Troubleshooting for Outdoor Unit SiEN18-622
388 Troubleshooting
Troubleshooting
∗2: Voltage measurement point
∗1: Refer to “Thermistor Resistance / Temperature Characteristics” table on P407.
∗2: Refer to “Pressure Sensor, Pressure / Voltage Characteristics” table on P409.
(V2819)
YES
YES
NO
NO
YES
YES
NO
NO
Cooling
NO
NO
YES
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Out of gas, closing of stop
valve or refrigerant system
is clogged. Requires check
of refrigerant system.
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.
Replace the low pressure
sensor.
Replace the outdoor unit
PC b
oard (A1P).
The suction
pipe1 temp. minus low
pressure saturation
temp. is 20 °C or
higher.
Is the
low pressure sensor
correct?
Resistance
is normal when
measured with the
thermistor (R3T) for
suction pipe1
disconnected from the
outdoor unit
PC board.
*1
Low pressure is
0.25 MPa
or less.
The
voltage of
X18A pins (2)
and (3) on main
outdoor unit PC bo
ard
(A1P) is 1.0 VDC or
less. (Low pressure
sensor output
voltage) *2
Outdoor unit PC board A1P
+5V
Microcomputer
A/D input
*2 Measure voltage here.
X18A
Red
Black
White
Low pressure sensor
(V2809)
GND