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14 Troubleshooting
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).
Recommended replacement cycle of wear parts
Component
Inspection
Air filter
High efficiency filter
Fuse
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
Troubleshooting
If one of the following malfunctions occurs, take the measures
shown below and contact your dealer.
The system MUST be repaired by a qualified service person.
Installation and operation manual
18
Maintenance cycle
cycle
(replacements and/or
repairs)
1 year
5 years
1 year
10 years
In case of corrosion,
contact your local dealer.
Malfunction
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
▪ Check if there is no power failure. Wait
operate at all.
until power is restored.
▪ Check if no fuse has blown or breaker is
activated. Change the fuse or reset the
breaker if necessary.
The system operates
▪ Check if air inlet or outlet of outdoor or
but cooling or heating
indoor unit is not blocked by obstacles.
is insufficient.
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.
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.
14.1
To solve the problems with your
fan coil unit
Your fan coil unit does not function
If your fan coil unit does not function:
Check:
Has the fan coil unit been
switched OFF?
Is there a power failure?
Has the circuit breaker (fuse)
been tripped?
Your fan coil unit does not cool or heat well
If your fan coil unit does not cool or heat well:
Check:
Is there an obstacle near the air
inlet or air outlet?
Are any doors and windows
open?
Measure
Turn off the main power
switch.
Stop the operation.
Turn off the power.
Measure
filter" [ 4 17]).
If yes,
Switch the fan coil unit ON.
Restore the power supply.
Contact your installer or service
company.
If yes,
Remove the obstacle.
Close doors and windows.
FWE-F
Fan coil units
3P756931-1 – 2023.11
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