Daikin LREN8A7Y1B Installation And Operation Manual page 45

Main code LREN*
O
O
O
O
O
O
—
O
O
O
NOTICE
After turning ON the operation switch, wait at least
1 minute before turning OFF the power supply. Electrical
leakage detection is
compressor starts. Turning off the power supply during this
check will result in an incorrect detection.
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704141-1B – 2022.12
LRNUN5*
O ▪ Heat exchanger of outdoor unit is blocked.
▪ The outdoor temperature is above the
maximum operating temperature.
O Supply voltage dropped.
O Transmission outdoor unit – inverter: INV1/
FAN1 transmission trouble
O Unbalanced power supply voltage
O Lost phase in power supply
O Insufficient supply voltage
O Communication error between the capacity
up unit and the outdoor unit.
— Communication error between the capacity
up unit and the outdoor unit.
— Refrigerant leaking
— Refrigerant over charging
performed shortly after the
Cause
▪ Check if any obstacles block the heat
exchanger and remove them.
▪ Operate the unit only within the temperature
operation range.
▪ Check the power supply.
▪ Check the wiring size and length of the
power supply. They must be according to the
specifications.
Check connection.
Check the power supply.
Check the connection of the power supply
cable.
Check the power supply.
Check the connection of the communication
cables upstream between the capacity up unit
and outdoor unit. (Error displayed on the
capacity up unit.)
Check the connection of the communication
cables upstream between the capacity up unit
and outdoor unit. (Error displayed on the
outdoor unit.)
Check the refrigerant amount
Check the refrigerant amount
18 Troubleshooting
Solution
Installation and operation manual
45