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Troubleshooting
Installer and user reference guide
142
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
Main code
LREN*
LRNUN5*
Cause
Solution
O
O
Malfunction of high pressure sensor
For LREN*:
▪
(S1NPH) – A2P (X31A)
For LRNUN5*:
▪
(S1NPH) – A1P (X31A)
Check connection on PCB or
actuator.
O
O
Malfunction of low pressure sensor
For LREN*:
▪
(S1NPL) – A1P (X31A)
▪
(S2NPL) – A1P (X32A)
▪
(S1NPM) – A12P (X31A)
▪
(S2NPM) – A2P (X32A)
For LRNUN5*:
▪
(S1NPL) – A1P (X32A)
▪
(S2NPM) – A6P (X31A)
Check connection on PCB or
actuator.
O
O
▪
Heat exchanger of outdoor unit is
blocked.
▪
The outdoor temperature is
above the maximum operating
temperature.
▪
Check if any obstacles block the
heat exchanger and remove them.
▪
Operate the unit only within the
temperature operation range.
O
O
Supply voltage dropped.
▪
Check the power supply.
▪
Check the wiring size and length of
the power supply. They must be
according to the specifications.
O
O
Transmission outdoor unit –
inverter: INV1/FAN1 transmission
trouble
Check connection.
O
O
Unbalanced power supply voltage
Check the power supply.
O
O
Lost phase in power supply
Check the connection of the power
supply cable.
O
O
Insufficient supply voltage
Check the power supply.
—
O
Communication error between the
capacity up unit and the outdoor
unit.
Check the connection of the
communication cables upstream
between the capacity up unit and
outdoor unit. (Error displayed on the
capacity up unit.)
O
—
Communication error between the
capacity up unit and the outdoor
unit.
Check the connection of the
communication cables upstream
between the capacity up unit and
outdoor unit. (Error displayed on the
outdoor unit.)
O
—
Refrigerant leaking
Check the refrigerant amount
O
—
Refrigerant over charging
Check the refrigerant amount
