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11
Maintenance after a long period of non-use
Check for and remove anything that might be blocking the
inlet and outlet vents of the indoor units and outdoor units.
Clean the unit casing and clean the lter. Refer to [Cleaning
the lter] and "Cleaning the lter" for instructions. Re-install
the lter before running the unit.
Turn on the power at least 12 hours before you want to use
the unit to ensure it works properly. As soon as the power is
turned on, the remote control display appears.
The following symptoms may be experienced during the
normal operation of the unit and are not considered faults.
Note: If you are not sure whether a fault has occurred, contact
your supplier or service engineer immediately.
Symptom: When the ON/OFF button on the remote controller
is pressed, the unit does not immediately start running.
Cause: To protect certain system components, system start-
up or re-start is intentionally delayed for up to 12 minutes
under some operating conditions. If the OPERATION LED on
the unit's panel is lighting, the system is working normally and
the unit will start after the intentional delay is complete.
Heating mode is running when the following panel lights are
on: operation and the "DEF./FAN LED indicator (cooling and
heating type) or the fan only indicator (cooling only type)".
When it starts but the compressor does not, the indoor
unit activates protective measures because of the outlet
temperature.
White mist is generated and emitted when the unit starts
to operate in a very humid environment. This phenomenon
will stop once the humidity in the room is reduced to normal
levels.
The unit occasionally emits white mist when it runs in
heating mode. This occurs when the system nishes periodic
defrosting. Moisture that may accumulate on the unit's heat
exchanger coil during defrosting becomes mist and is emitted
from the unit.
6. SYMPTOMS THAT ARE NOT FAULTS
Symptom 1: The unit will not run
Symptom 2: The unit emits white mist
A continuous sound (other than that made by the unit's fan) is
heard when the unit is running in cooling mode. This is caused
by the unit's drain pump (on units that have a drain pump).
A squeaking sound is heard when the unit stops after running
in heating mode. This is caused by plastic components cooling
down and contracting.
A slight hissing sound is heard when the unit is running. This
is the sound of refrigerant owing through the unit and through
the piping that connects the unit to the rest of the system. This
sound is more noticeable when the unit starts/stops running
and the ow of refrigerant begins/ceases.
This can occur when the unit rst runs after a long idle period.
If smells such as those of strong-smelling food or tobacco
smoke are present in the room, they can enter the unit, leave
trace deposits on the unit's internal components, and later be
emitted from the unit.
Sections 7.2 and 7.3 describe some initial troubleshooting
steps that can be taken when an error occurs. If these steps do
not resolve the issue, arrange for a professional technician to
investigate the problem. Do not attempt further investigations
or troubleshooting yourself.
If any of the following errors occur, power the unit off, contact
a professional technician immediately and do not attempt
troubleshooting yourself:
- A safety device such as a fuse or circuit breaker frequently
blows/trips.
- An object or water enters the unit.
- Water is leaking from the unit.
Symptom 3: The unit emits sounds
Symptom 4: Dust is emitted from the unit
Symptom 5: The unit gives off a strange odor
7. TROUBLESHOOTING
7.1 General
13


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