8 Troubleshooting
Installation and operation manual
10
FXSN50~112A2VEB
CO
₂
Conveni-Pack: indoor unit
4P602815-1C – 2020.05
WARNING
▪ Do NOT pierce or burn refrigerant cycle parts.
▪ Do NOT use cleaning materials other than those
recommended by the manufacturer.
▪ Be aware that the refrigerant inside the system is
odourless.
WARNING
The refrigerant R744 (CO
2
) inside the unit is odourless,
non-flammable and, in moderate concentrations, non-toxic,
and normally does NOT leak.
If the refrigerant leaks in the room, it may have negative
effects
on
its
occupants
(asphyxiant
in
high
concentrations). Ventilate the room and contact the dealer
where you purchased the unit (see
10]).
Do NOT use the unit until a service person confirms that
the part from which the refrigerant leaked has been
repaired.
7.3.1
About refrigerant leak detection
In order to detect refrigerant leaks, a CO
2
refrigerant leak detector
(field supply) MUST be installed. The CO
2
refrigerant leak detector
may require annual tests. For more details, see the documentation
of the installed device.
In case a CO
2
refrigerant leak is detected
▪ the fan of the indoor unit is stopped to prevent the refrigerant from
being spread,
▪ the user interface displays error code A0 or U9 (
for the
Madoka; to display error codes, refer to the reference guide of the
Madoka),
▪ a warning sound will come from the user interface ( only for
Madoka with buzzer, see option list) or from another safety alarm
in combination with a CO
2
refrigerant leak detector (field supply).
Actions required by the user
1
Ventilate the room and immediately contact the dealer where
you purchased the unit. Do NOT use the unit before the fault is
fixed.
Actions required by the installer or the service person
INFORMATION
During detection of the refrigerant leakage, the contact
between terminals T1 and T2 disconnects. During normal
operation, the contact between terminals T1 and T2 is
closed (acting as a short circuit).
1
If field supplied stop-valves are NOT installed: Close the stop
valves of the gas and liquid pipe on the outdoor unit.
2
If field supplied shut-off valves are installed: If the refrigerant
leak to the room has stopped, you can use the air conditioner
for other rooms where the refrigerant leak did NOT occur.
3
Locate and repair the cause of the refrigerant leak. If
necessary, replace the indoor unit.
4
Refill the refrigerant if needed.
5
Perform manual power reset and resume operation.
NOTICE
After the refrigerant leakage is detected, the unit will send
a signal at regular intervals to confirm if the CO
2
concentration is at a safe level. Even when the CO
2
concentration is at a safe level, do NOT resume operation
before the fault is fixed and the refrigerant is refilled.
8
Troubleshooting
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, electric shock or fire. Contact your dealer.
The system MUST be repaired by a qualified service person.
Malfunction
Measure
If a safety device such as a fuse, a
breaker or an earth leakage breaker
frequently actuates or the ON/OFF
switch does NOT function properly.
Turn OFF all main power
supply switches to the
unit.
If water leaks from the unit.
Stop operation.
The operation switch does NOT function
properly.
Turn OFF the power
supply.
If the user interface displays
or an
error code.
Notify your installer and
report the error code. To
display error codes, see
the reference guide of the
user interface.
The user interface displays error code
A0 or U9 (or
), the fan stops and you
can hear a warning sound from the user
interface (in case of Madoka) or from
another safety alarm in combination
with a gas detection device (if installed).
A refrigerant leak may be
detected (see
10]).
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.
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).
Malfunction
Measure
If the system does not
operate at all.
▪ Check if there is no power failure. Wait
until power is restored. If a power failure
occurs during operation, the system
automatically restarts immediately after
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.
▪ Check if the air filter is clogged (see
