Daikin LRLEQ3BY1 Installation And Operation Manual page 28

8 Troubleshooting
Code Description
Wet operation from refrigeration
suction pipe
Wet operation from injection pipe Suction superheat ≥5 K AND discharge
3‑sensor error
High pressure switch failure
Outdoor fan motor signal failure
Outdoor air thermistor failure
Discharge thermistor failure
Suction thermistor failure
Heat exchanger inlet thermistor
failure
Heat exchanger outlet thermistor
failure
High pressure sensor failure
Low pressure sensor failure
Inverter PCB malfunction
Radiation fin temperature rise
Inverter compressor
instantaneous overcurrent
Inverter compressor overcurrent
Defective inverter compressor
startup failure
Transmission error between
control PCB and inverter PCB
Inverter compressor power
voltage imbalance
Radiation fin thermistor
Reversed phase / Open phase
Inverter compressor abnormal
power voltage
Installation and operation manual
28
Criteria
Suction superheat <5 K AND discharge
superheat <15 K AND discharge temperature
<60°C, continuously for 10 minutes
In addition to above conditions (for caution):
discharge superheat <15 K for 6 hours
superheat <15 K AND discharge temperature
<60°C, continuously for 90 minutes
In addition to above conditions (for caution):
discharge superheat <15 K for 6 hours
When 3 or more sensors detect abnormality
No continuity of high pressure switch
Abnormal position of signal of 1 fan motor
Abnormal position of signal of 2 fan motors
Open circuit or shortcircuit
Open circuit or shortcircuit
Open circuit or shortcircuit
Open circuit or shortcircuit
Open circuit or shortcircuit
Open circuit or shortcircuit
Open circuit or shortcircuit
IGBT error
93°C
—
≥16.1 A
—
Transmission failure between main PCB and
inverter PCB
—
Radiation fin thermistor open circuit or short
circuit
Reversed phase or open phase
—
Times of Output signal
retry
0 Caution ▪ Excessive frost formation on indoor
side
▪ Wrong selection of expansion valves
0 Warning
0 Caution ▪ Defective expansion valve, suction pipe
thermistor, or subcool heat exchanger
outlet thermistor
▪ Refrigerant overcharge
0 Warning
0 Warning ▪ Faulty connection of sensor
▪ Defective sensor or outdoor unit PCB
0 Warning ▪ Faulty connection of switch
▪ Defective swith or outdoor unit PCB
4 Caution ▪ Abnormal fan motor signal (circuit
error)
4 Warning
▪ Broken, short, or disconnected
connector of fan motor connection
cable
▪ Defective inverter PCB
0 Caution ▪ Faulty connection of sensor
▪ Defective sensor
0 Warning ▪ Faulty connection of sensor
▪ Defective sensor
0 Caution ▪ Faulty connection of sensor
▪ Defective sensor
0 Warning ▪ Faulty connection of sensor
▪ Defective sensor
0 Warning ▪ Faulty connection of sensor
▪ Defective sensor
0 Caution ▪ Faulty connection of sensor
▪ Defective sensor
0 Warning ▪ Faulty connection of sensor
▪ Defective sensor
0 Warning ▪ Defective inverter PCB
9 Warning ▪ Fin temperature rise because of
inverter malfunction
▪ Fin temperature rise because of short
circuit
▪ Fin thermistor malfunction
9 Warning —
9 Warning —
4 Warning —
No limit Caution Defective connection between main and
inverter PCB
9 Warning Unbalanced power supply voltage
No limit Caution Defective radiation fin thermistor, inverter
PCB, inverter compressor, or fan motor
0 Warning Faulty connection of phase order to power
supply terminal X1M
9 Warning Insufficient power supply voltage
Cause Solution
▪ Adjust defrost cycle
▪ Select the correct type of expansion
valve
▪ Replace defective component
▪ Adjust refrigerant charge
▪ Connect the sensor properly
▪ Replace defective component
▪ Connect the switch properly
▪ Replace defective component
▪ Ensure correct connection
▪ Replace the fan motor
▪ Replace the inverter PCB
▪ Connect the sensor properly
▪ Replace defective component
▪ Connect the sensor properly
▪ Replace defective component
▪ Connect the sensor properly
▪ Replace defective component
▪ Connect the sensor properly
▪ Replace defective component
▪ Connect the sensor properly
▪ Replace defective component
▪ Connect the sensor properly
▪ Replace defective component
▪ Connect the sensor properly
▪ Replace defective component
▪ Check for external causes (e.g. EMI
noise), or replace the inverter PCB.
▪ Remove any obstacles that block the
passage of air to the outdoor unit
▪ Check connection on PCB
▪ Replace defective component
—
—
—
Replace defective component
Check if power supply is within range
Replace defective component
Make sure the phase order to X1M is ok
Make sure there is sufficient power supply
voltage
LRMEQ+LRLEQ3+4BY1
Air-cooled refrigeration condensing unit
4P545024-1 – 2018.09