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Troubleshooting
Installer and user reference guide
126
LRYELRNUN5A7Y1
CO₂ Conveni-Pack outdoor unit
4P605460-1 – 2020.08
Main code
LRYEN10* LRNUN5* Cause
Solution
O
O
Malfunction of high pressure sensor
For LRYEN10*:
▪
(S1NPH) – A2P (X31A)
For LRNUN5*:
▪
(S1NPH) – A1P (X31A)
Check connection on PCB or
actuator.
O
O
Malfunction of low pressure sensor
For LRYEN10*:
▪
(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 to outdoor
unit or indoor unit
Check the connection of the
communication cables upstream of
indoor units (error displayed on
remote controller) or outdoor unit.
O
—
Communication error to indoor unit
or capacity up unit
Check the connection of the
communication cables downstream
of indoor units (error displayed on
remote controller).
O
—
Wrong combination of outdoor unit
with indoor units
▪
Check the number of connected
indoor units.
▪
Check if an indoor unit is installed
that is not a possible combination.
