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14 Troubleshooting
13.4
Maintenance after a long stop
period
E.g., at the beginning of the season.
▪ Check and remove everything that might be blocking inlet and
outlet vents of indoor units and outdoor units.
▪ Clean air filters and casings of indoor units (see
filter" [ 4 17] and To clean the air outlet and outside panels).
the air
13.5
Maintenance before a long stop
period
E.g., at the end of the season.
▪ Let the indoor units run in fan only operation for about half a day in
order to dry the interior of the units. Refer to About cooling,
heating, fan only, and automatic operation for details on fan only
operation.
▪ Turn off the power. The user interface display disappears.
▪ Clean air filters and casings of indoor units (see
filter" [ 4 17] and To clean the air outlet and outside panels).
the air
13.6
After-sales service and warranty
13.6.1
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.
13.6.2
Shortened maintenance and replacement
cycles
Shortening of "maintenance cycle" and "replacement cycle" needs to
be considered in following situations:
The unit is used in locations where:
▪ Heat and humidity fluctuate out of the ordinary.
▪ Power fluctuation is high (voltage, frequency, wave distortion, etc.)
(the unit cannot be used if power fluctuation is outside the
allowable range).
▪ Bumps and vibrations are frequent.
▪ Dust, salt, harmful gas or oil mist such as sulphurous acid and
hydrogen sulfide may be present in the air.
▪ The machine is started and stopped frequently or operation time is
long (sites with 24 hour air-conditioning).
Installation and operation manual
18
Recommended replacement cycle of wear parts
Component
Air filter
High efficiency filter
Fuse
"13.3.1 To clean
Pressure containing parts
INFORMATION
Damage due to taking apart or cleaning interiors of units by
anyone other than our authorised dealers may not be
included in the warranty.
14
If one of the following malfunctions occurs, take the measures
"13.3.1 To clean
shown below and contact your dealer.
The system MUST be repaired by a qualified service person.
If a safety device such as a fuse, a
breaker or an earth leakage breaker
frequently actuates or the ON/OFF
switch does not properly work.
If water leaks from the unit.
The operation switch does not work
well.
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
If the system does not
operate at all.
The system operates
but cooling or heating
is insufficient.
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.
Inspection
cycle
1 year
contact your local dealer.
Troubleshooting
Malfunction
Turn off the main power
switch.
Stop the operation.
Turn off the power.
Measure
▪ Check if there is no power failure. Wait
until power is restored.
▪ Check if no fuse has blown or breaker is
activated. Change the fuse or reset the
breaker if necessary.
▪ 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 not clogged (see
"13.3.1 To clean the air
▪ Check the temperature setting.
▪ Check the fan speed setting on your user
interface.
▪ Check for open doors or windows. Close
doors and windows to prevent wind from
coming in.
▪ Check if there are too many occupants in
the room during cooling operation. Check
if the heat source of the room is
excessive.
▪ Check if direct sunlight enters the room.
Use curtains or blinds.
▪ Check if the air flow angle is proper.
Maintenance cycle
(replacements and/or
repairs)
5 years
1 year
10 years
In case of corrosion,
Measure
filter" [ 4 17]).
FWE-F
Fan coil units
3P756931-1 – 2023.11
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