8 Troubleshooting
Installation and operation manual
25
4BY1
Air-cooled refrigeration condensing unit
4P495373-1 – 2017.07
8.1.2
Error codes: Overview
Code
Description
Criteria
Times of
retry
Output signal
Cause
Solution
Abnormally high pressure level
High pressure switch ≥4.0 MPa (40 bar)
0
Warning
▪
The stop valves are closed
▪
Excessive refrigerant charge
▪
Open the gas and liquid stop valves
▪
Recalculate the additional refrigerant
charge and recover any excessive
refrigerant with a refrigerant recovery
machine
High pressure sensor ≥3.55 MPa (35.5 bar)
3
Warning
Inverter compressor motor lock
Position signal error
4
Warning
▪
The stop valves are closed
▪
Incorrect wiring
▪
Open the gas and liquid stop valves
▪
Ensure correct
▪
Phase order
▪
Wiring
Outdoor unit fan motor
malfunction
Irregular revolution of 1 fan motor
4
Caution
Fan motor malfunction:
▪
M1F - A2P (X106A)
▪
M2F - A2P (X107A)
Check actuator, or connection on PCB
Irregular revolution of 2 fan motors
4
Warning
Electronic expansion valve
abnormality
No continuity of electronic expansion valve
coil
0
Warning
Electronic expansion valve malfunction:
Y1E - A1P (X21A)
Check actuator, or connection on PCB
Abnormal discharge pipe
temperature
Discharge pipe temperature >150°C
0
Warning
▪
Refrigerant shortage
▪
Defective discharge thermistor or
outdoor unit PCB
▪
Clogging of expansion valve for
injection
▪
Charge additional refrigerant
▪
Replace defective component
▪
Repair clogging
▪
Discharge pipe temperature >120°C
continuously for 70 seconds or more
▪
Discharge pipe temperature >125°C
continuously for 30 seconds or more
▪
Discharge pipe temperature >130°C
14
Warning
Discharge pipe temperature >110°C AND
Y1E ≥450 pls, continuously for 60 seconds
1
Caution
3
Warning
Wet operation from refrigeration
suction pipe
Suction superheat <5 K AND discharge
superheat <15 K AND discharge temperature
<60°C, continuously for 10 minutes
0
Caution
▪
Excessive frost formation on indoor
side
▪
Wrong selection of expansion valves
▪
Adjust defrost cycle
▪
Select the correct type of expansion
valve
In addition to above conditions (for caution):
discharge superheat <15 K for 6 hours
0
Warning
Wet operation from injection pipe
Suction superheat ≥5 K AND discharge
superheat <15 K AND discharge temperature
<60°C, continuously for 90 minutes
0
Caution
▪
Defective expansion valve, suction pipe
thermistor, or subcool heat exchanger
outlet thermistor
▪
Refrigerant overcharge
▪
Replace defective component
▪
Adjust refrigerant charge
In addition to above conditions (for caution):
discharge superheat <15 K for 6 hours
0
Warning
3‑sensor error
When 3 or more sensors detect abnormality
0
Warning
▪
Faulty connection of sensor
▪
Defective sensor or outdoor unit PCB
▪
Connect the sensor properly
▪
Replace defective component
High pressure switch failure
No continuity of high pressure switch
0
Warning
▪
Faulty connection of switch
▪
Defective swith or outdoor unit PCB
▪
Connect the switch properly
▪
Replace defective component
Outdoor fan motor signal failure
Abnormal position of signal of 1 fan motor
4
Caution
▪
Abnormal fan motor signal (circuit
error)
▪
Broken, short, or disconnected
connector of fan motor connection
cable
▪
Defective inverter PCB
▪
Ensure correct connection
▪
Replace the fan motor
▪
Replace the inverter PCB
Abnormal position of signal of 2 fan motors
4
Warning
Outdoor air thermistor failure
Open circuit or shortcircuit
0
Caution
▪
Faulty connection of sensor
▪
Defective sensor
▪
Connect the sensor properly
▪
Replace defective component
Discharge thermistor failure
Open circuit or shortcircuit
0
Warning
▪
Faulty connection of sensor
▪
Defective sensor
▪
Connect the sensor properly
▪
Replace defective component
Suction thermistor failure
Open circuit or shortcircuit
0
Caution
▪
Faulty connection of sensor
▪
Defective sensor
▪
Connect the sensor properly
▪
Replace defective component
Heat exchanger inlet thermistor
failure
Open circuit or shortcircuit
0
Warning
▪
Faulty connection of sensor
▪
Defective sensor
▪
Connect the sensor properly
▪
Replace defective component
Heat exchanger outlet thermistor
failure
Open circuit or shortcircuit
0
Warning
▪
Faulty connection of sensor
▪
Defective sensor
▪
Connect the sensor properly
▪
Replace defective component
High pressure sensor failure
Open circuit or shortcircuit
0
Caution
▪
Faulty connection of sensor
▪
Defective sensor
▪
Connect the sensor properly
▪
Replace defective component
Low pressure sensor failure
Open circuit or shortcircuit
0
Warning
▪
Faulty connection of sensor
▪
Defective sensor
▪
Connect the sensor properly
▪
Replace defective component
Inverter PCB malfunction
IGBT error
0
Warning
▪
Defective inverter PCB
▪
Check for external causes (e.g. EMI
noise), or replace the inverter PCB.
Radiation fin temperature rise
93°C
9
Warning
▪
Fin temperature rise because of
inverter malfunction
▪
Fin temperature rise because of short
circuit
▪
Fin thermistor malfunction
▪
Remove any obstacles that block the
passage of air to the outdoor unit
▪
Check connection on PCB
▪
Replace defective component
Inverter compressor
instantaneous overcurrent
—
9
Warning
—
—
Inverter compressor overcurrent
≥16.1 A
9
Warning
—
—
Defective inverter compressor
startup failure
—
4
Warning
—
—
Transmission error between
control PCB and inverter PCB
Transmission failure between main PCB and
inverter PCB
No limit
Caution
Defective connection between main and
inverter PCB
Replace defective component
Inverter compressor power
voltage imbalance
—
9
Warning
Unbalanced power supply voltage
Check if power supply is within range
Radiation fin thermistor
Radiation fin thermistor open circuit or short
circuit
No limit
Caution
Defective radiation fin thermistor, inverter
PCB, inverter compressor, or fan motor
Replace defective component
Reversed phase / Open phase
Reversed phase or open phase
0
Warning
Faulty connection of phase order to power
supply terminal X1M
Make sure the phase order to X1M is ok
Inverter compressor abnormal
power voltage
—
9
Warning
Insufficient power supply voltage
Make sure there is sufficient power supply
voltage
Содержание LRMEQ3BY1
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