18 Troubleshooting
Installation and operation manual
43
LREN8~12A7 + LRNUN5A7
CO
₂
ZEAS outdoor unit and capacity up unit
4P704141-1B – 2022.12
Furthermore, you can add:
▪ Instructions for shutting down the system in case of an emergency
▪ Name and address of fire department, police and hospital
▪ Name, address and day and night telephone numbers for
obtaining service
Location of the logbook
The logbook shall either be kept in the machinery room, or the data
shall be stored digitally by the operator with a printout in the
machinery room, in which case the information shall be accessible to
the competent person when servicing or testing.
18
Troubleshooting
18.1
Solving problems based on error
codes
If the unit runs into a problem, the user interface displays an error
code. It is important to understand the problem and to take
measures before resetting an error code. This should be done by a
licensed installer or by your local dealer.
This chapter gives you an overview of all possible error codes and
their descriptions as they appear on the user interface.
For detailed troubleshooting of each error, see the service manual.
18.1.1
Error codes: Overview
In case other error codes appear, contact your dealer.
Main code
LREN*
LRNUN5*
Cause
Solution
O
O
Electrical leakage
Correct the field wiring and connect ground
wiring.
O
—
Stop valves are closed.
Open the stop valve on both the gas and liquid
side.
O
O
Malfunction of fan motor
For LREN*:
▪ (M1F) - A9P (X1A)
▪ (M2F) - A10P (X1A)
▪ (M3F) - A11P (X1A)
For LRNUN5*:
▪ (M1F) - A4P (X1A)
Check connection on PCB or actuator.
O
O
Malfunction of electronic expansion valve coil
For LREN*:
▪ (Y1E) - A1P (X25A)
▪ (Y2E) - A1P (X23A)
▪ (Y3E) - A1P (X21A)
▪ (Y4E) - A2P(X22A)
▪ (Y5E) - A2P (X21A)
▪ (Y7E) - A2P(X23A)
▪ (Y8E) - A1P (X22A)
▪ (Y14E) - A2P(X25A)
▪ (Y15E) - A1P (X26A)
For LRNUN5*:
▪ (Y3E) - A1P (X21A)
▪ (Y1E) - A1P (X22A)
▪ (Y4E) - A1P (X23A)
▪ (Y2E) - A1P (X24A)
Check connection on PCB or actuator.
O
—
Wrong selection of cooling load (including the
expansion valves)
Reselect the cooling load, including the
expansion valve.
O
O
Malfunction of ambient temperature sensor
For LREN* and LRNUN5*:
▪ (R1T) - A1P (X18A)
Check connection on PCB or actuator.
