Daikin ERQ - 4. Troubleshooting by Indication on the Unified ON;OFF Controller; 4.1 Operation Lamp Blinks

Troubleshooting by Indication on the Remote Controller ESIE09-05
208 Troubleshooting
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.
(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.
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.
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