7 Troubleshooting
Installation and operation manual
11
LREN8~12A7 + LRNUN5A7
CO
₂
ZEAS outdoor unit and capacity up unit
4P704141-1B – 2022.12
WARNING
▪ Do NOT pierce or burn refrigerant cycle parts.
▪ Be aware that the refrigerant inside the system is
odourless.
WARNING
The R744 refrigerant (CO
2
) inside the unit is odourless,
non-flammable and normally does NOT leak.
If the unit is installed indoors, ALWAYS install a CO
2
detector according to the specifications of standard EN378.
If the refrigerant leaks in high concentrations in the room, it
may have negative effects on its occupants such as
asphyxiation and carbon dioxide poisoning. Ventilate the
room and contact the dealer where you purchased the unit.
Do NOT use the unit until a service person confirms that
the part from which the refrigerant leaked has been
repaired.
6.2
Recommended maintenance and
inspection
Since dust collects when using the unit for several years,
performance of the unit will deteriorate to some extent. As taking
apart and cleaning interiors of units requires technical expertise and
in order to ensure the best possible maintenance of your units, we
recommend to enter into a maintenance and inspection contract on
top of normal maintenance activities. Our network of dealers has
access to a permanent stock of essential components in order to
keep your unit in operation as long as possible. Contact your dealer
for more information.
When asking your dealer for an intervention, always state:
▪ The complete model name of the unit.
▪ The manufacturing number (stated on the nameplate of the unit).
▪ The installation date.
▪ The symptoms or malfunction, and details of the defect.
WARNING
Do NOT modify, disassemble, remove, reinstall or repair
the unit yourself as incorrect dismantling or installation may
cause an electrical shock or fire. Contact your dealer.
7
Troubleshooting
If system malfunctions are likely to degrade the articles in the room/
showcase, you can ask your installer to install an alarm (example:
lamp). For more information, contact your installer.
If one of the following malfunctions occur, take the measures shown
below and contact your dealer.
WARNING
Stop operation and shut OFF the power if anything
unusual occurs (burning smells etc.).
Leaving the unit running under such circumstances may
cause breakage, electrical shock or fire. Contact your
dealer.
The system MUST be repaired by a qualified service person.
Malfunction
Measure
A safety device such as a fuse, a
breaker or an earth leakage breaker
frequently actuates or the ON/OFF
switch does NOT work properly.
Contact your dealer or
installer.
Malfunction
Measure
Water (other than defrost water) leaks
from the unit.
Stop the operation.
The operation switch does NOT work
well.
Turn OFF the power
supply.
The user interface display indicates the
unit number, the operation lamp flashes
and the malfunction code appears.
Notify your installer and
report the malfunction
code.
The safety valve has opened.
1
Stop the operation.
2
Turn OFF the power
supply.
3
Inform your installer.
If the system does NOT operate properly except for the above
mentioned cases and none of the above mentioned malfunctions is
evident, investigate the system in accordance with the following
procedures.
Malfunction
Measure
If the system does not
operate at all.
▪ Check if there is no power failure. Wait
until power is restored. If power failure
occurs during operation, the system
automatically restarts immediately after
the power is restored.
▪ Check if no fuse has blown or breaker is
activated. Change the fuse or reset the
breaker if necessary.
The system stops
immediately after
starting operation.
▪ Check if air inlet or outlet of outdoor or
indoor unit is not blocked by obstacles.
Remove any obstacles and make sure
the air can flow freely.
The system operates
but cooling is
insufficient.
(for refrigerator and
freezer indoor units)
▪ Check if air inlet or outlet of outdoor or
indoor unit is not blocked by obstacles.
Remove any obstacles and make sure
the air can flow freely.
▪ Check if the indoor unit is not frosted up.
Defrost the unit manually, or shorten the
defrost operation cycle.
▪ Check if there are not too many articles
inside the room/showcase. Remove a
couple of articles.
▪ Check if there is smooth air circulation
inside the room/showcase. Reorganise
the articles inside the room/showcase.
▪ Check if there is not too much dust on
the
outdoor
unit
heat
exchanger.
Remove the dust with a brush or vacuum
cleaner,
without
using
water.
If
necessary, consult your dealer.
▪ Check if there is cold air leaking outside
of the room/showcase. Stop the air from
leaking outside.
▪ Check if you did not set the indoor unit
setpoint temperature too high. Set the
setpoint appropriately.
▪ Check if there are no high-temperature
articles stored in the room/showcase.
Always store articles after they have
cooled down.
▪ Check if the door is not opened too long.
Reduce the opening time of the door.
If after checking all above items, it is impossible to fix the problem
yourself, contact your installer and state the symptoms, the complete
model name of the unit (with manufacturing number if possible) and
the installation date (possibly listed on the warranty card).
