(4) Error diagnosis
procedures at the outdoor units side
At the error diagnosis related to the outdoor unit, check at
first the error code of remote controller and the illumination patterns of
norma1 and inspection display lamps in the same manner as
the case of indoor unit.
Then estimate the outline, the cause and the location of
error based on the pattern and proceed to the inspection and repair.
Since the self diagnosis function by means of the
microcomputers of indoor/outdoor units provide the judgement of error of
microcomputers them selves irregularity power supply line,
overload, etc. caused by the installation space, inadequate volume of
refrigerant etc., the location and cause of trouble will be
discovered without difficulty.
In addition, the display lamps error code of indoor/outdoor
unit is kept flashing, (except when the power supply is interrupted) after
the irregularity is automatically recovered to give
irregularity information to the service personnel. If any mode of higher
than the error retained in memory occurs after the reset of
error, it is switched to that mode and saved in the memory.
(a) Replacement parts assembly related to the outdoor unit
Outdoor unit PCB, power transistor module, capacitor, noise
filter, thermistor, (heat exchanger, discharge pipe, outdoor
temperature, power transistor), fuse, transformer, etc.
(b) Replacement procedure of outdoor unit microcomputer
printed circuit board.
Microcomputer printed circuit board can replaced with
1) Confirm the parts numbers. (Refer to the following parts
layout drawing for the location of parts number.)
Characteristics of HEAT mode operation
Mechanism and capacity of HEAT mode operation
• The unit draws in heat from the cold outside air,
transfers it indoors and heats the room. The heating capacity of the heat
pump mechanism decreases
when the outside air temperature gets colder.
• The hot air circulation system takes a while before
warming up the room temperature.
• If the outside temperature becomes extremely low, it would
be better to use an additional source of heating.
If the outside temperature becomes low and humidity is high,
the heat exchanger in the outdoor unit may frost over, which prevents
If this happens, the automatic defroster is activated and
during defrosting the heating operation stops for 5 to 10 minutes.
• Both indoor and outdoor fans stop and the RUN light
(green) blinks slowly (1.5 sec. ON, 0.5 sec. OFF) during defrosting.
• The outdoor unit may give off some steam during
defrosting. This is to help the defrosting process and is not a defect.
• The HEAT operation resumes as soon as defrosting has been
Air conditioner operating conditions
Use within the following operational range. Operating
outside of this range may result in the protection devices being activated,
preventing the unit from working.
Outside temperature Approximately 21 to 43 °C
Below approximately -15 to 21 °C
Below approximately 80%
The long-term use of the unit with a humidity level Inside
humidity exceeding 80% may result in condensation forming on the — surface
of the indoor unit, leading to water drips.
Dependent upon service conditions and operating
environment, the inside of the air conditioner may become dirty after a
number of seasons'
service (3 to 5 years). This will reduce performance. In
addition to normal cleaning, we would recommend inspection and maintenance.
(The air conditioner has a longer life without any trouble.)
• Contact your dealer, or any distributor, for inspection
and maintenance. (There will be a charge for this service).
• We would recommend inspection and maintenance to be
carried out during the off-season.
• If the supply cord of this appliance is damaged, it must
only be replaced by a repair shop appointed by the manufacturer, because
special purpose tools are required.
Inspecting and replacing the natural enzyme filter and
the photo catalytic washable deodorizing filter
1. Open the air inlet grill and remove the air filters.
2. Remove the filter holders, with the natural enzyme filter
and the photo catalytic washable
deodorizing filter installed in the holders, from the air
3. Remove the natural enzyme filter from the filter holder
and inspect the filter. Use a vacuum
cleaner to remove any dust or dirt from the natural enzyme
filter. Replace the natural enzyme
filter if it cannot be cleaned or if it has been used for
about 1 year.
(The natural enzyme filter should be replaced after about 1
year of use. However, the actual
replacement period may vary depending on the conditions in
which the filter is used.)
Remove the photo catalytic washable deodorizing filter from
the filter holder and inspect the
filter. Periodically, remove any dust or dirt from the
photo catalytic washable deodorizing
filter. If the photo catalytic washable deodorizing filter is
particularly dirty, it may be washed
with water. However, the filter is fragile so be sure to
wash it installed in the filter holder to
avoid damaging it. After washing the filter, place it in
sunlight to dry. Placing the filter in
sunlight revitalizes the deodorizing effect.
(Do not dispose of the filter holders. They are reused.)
4. Install the natural enzyme filter and the photo catalytic
washable deodorizing filter in the filter
holders, and then install the filter holders in the air
5. Install the air filters and close the air inlet grill.
For replacement natural enzyme filters and photo catalytic
washable deodorizing filters, contact your dealer.