15 Troubleshooting
Installation and operation manual
22
FWF02~05D
Fan coil units
3P443944-9T – 2023.01
2
Remove the suction grille.
Standard panel:
45°
1
Design panel:
90°
3
Remove the air filter.
4
Clean the suction grille. Wash with a soft bristle brush, and
water or neutral detergent. If the suction grille is very dirty, use
a typical kitchen cleaner, leave it on for 10 min, then wash it
with water.
5
Reattach the air filter (step 3 in reverse order).
6
Reattach the suction grille and close it (step 2 and 1 in reverse
order).
14.4
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
21] and To clean the air outlet and outside panels).
14.5
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
21] and To clean the air outlet and outside panels).
14.6
After-sales service and warranty
14.6.1
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.
14.6.2
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
cycle
Maintenance cycle
(replacements and/or
repairs)
Air filter
1 year
5 years
High efficiency filter
1 year
Fuse
10 years
Pressure containing parts
In case of corrosion,
contact your local dealer.
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.
15
Troubleshooting
If one of the following malfunctions occur, take the measures shown
below and 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 properly work.
Turn off the main power
switch.
If water leaks from the unit.
Stop the operation.
The operation switch does not work
well.
Turn off the power.
