Daikin ERQ Service Manual page 218

Troubleshooting by Indication on the Remote Controller
Troubleshooting
∗2: Voltage measurement point
∗1: Refer to "Thermistor Resistance / Temperature Characteristics" table on P232.
∗2: Refer to "Pressure Sensor, Pressure / Voltage Characteristics" table on P234.
208
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
YES
Cooling
NO
The suction
pipe1 temp. minus
YES
low pressure saturation
temp. is 20 ˚C
or higher.
NO
Resistance
is normal when
measured with the
thermistor (R3T) for
NO
suction pipe1 disconnected
from the outdoor
unit PC
board.
∗1
YES
Is the
NO
low pressure sensor
correct?
YES
Low pressure
YES
is 0.25 MPa
or less.
NO
The
voltage
of X18A pins (2)
and (3) on main
YES
outdoor unit PC board
(A1P) is 1.0 VDC or less.
(Low pressure
sensor output
voltage)
∗2
NO
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ESIE09-05
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
board (A1P).
(V2819)
Troubleshooting