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12 Maintenance
▼ Periodic Maintenance
• For environmental conservation, it is strongly recommended that the indoor and outdoor units of the air
conditioner (including hot water module) in use be cleaned and maintained regularly to ensure efficient operation
of the air conditioner.
When the air conditioner (including hot water module) is operated for a long time, periodic maintenance (once a
year) is recommended.
Furthermore, regularly check the outdoor unit for rust and scratches, and remove them or apply rustproof
treatment, if necessary.
As a general rule, when an indoor unit is operated for 8 hours or more daily, clean the indoor unit and outdoor
unit at least once every 3 months. Ask a professional for this cleaning / maintenance work.
Such maintenance can extend the life of the product though it involves the owner’s expense.
Failure to clean the indoor and outdoor units regularly will result in poor performance, freezing, water leakage,
and even compressor failure.
Inspection before maintenance
Following inspection must be carried out by a qualified installer or qualified service person.
▼ Maintenance List
It recommends that a pump and a strainer are maintained periodically.
Parts Inspection method
Drain pan
Access from inspection opening and remove the front panel. Check if there is any clogging or drain
water is polluted.
Part Unit Check (visual / auditory) Maintenance
Heat exchanger Outdoor Dust / dirt clogging, scratches
Wash the heat exchanger when it is
clogged.
Fan motor Outdoor Sound
Take appropriate measures when
abnormal sound is generated.
Air inlet / outlet grilles Outdoor Dust / dirt, scratches
Fix or replace them when they are
deformed or damaged.
Drain pan Hot water module
Dust / dirt clogging, drain
contamination
Clean the drain pan and check the
downward slope for smooth drainage.
Exterior
Hot water module /
Outdoor
• Rust, peeling of insulator
• Peeling / lift of coat
Apply repair coating.
Water pipes Hot water module
Rust, leakage
Evidence of leakage
Checking
Strainer Hot water module Dust / dirt clogging Checking
Air vent valve Hot water module Air entrainment Checking an air vent valve
13 Troubleshooting
Confirmation and check
Troubleshooting history and confirmation
You can check the troubleshooting history with the following procedure if a problem occurs with the air conditioner
(including the Hot water module).
(The troubleshooting history records up to 4 incidents.)
You can check it during operation or when operation is stopped.
• If you check the troubleshooting history during OFF timer operation, the OFF timer will be canceled.
If a problem occurs with the air
conditioner (including the Hot water
module), the OFF timer indicator
alternately shows the check code and
the indoor Unit No. in which the
problem occurred.
Procedure Description of operation
1
Push the OFF timer button for over 10 seconds
and the indicators appear as an image indicating
the troubleshooting history mode has been
entered. If [ Service check] is displayed, the
mode enters in the troubleshooting history mode.
• [01: Order of troubleshooting history] appears in the
temperature indicator.
• The OFF timer indicator alternately shows the [check
code] and the [indoor Unit No. ] in which the problem
occurred.
2
Each time the setting button is pushed, the recorded
troubleshooting history is displayed in sequence.
The troubleshooting history appears in order from [01]
(newest) to [04] (oldest).
In the troubleshooting history mode, DO NOT
push the Menu button for over 10 seconds, doing
so deletes the entire troubleshooting history of
the indoor unit.
3
After you have finished checking, push the ON/OFF
button to return to the regular mode.
• If the air conditioner (including the Hot water module)
is operating, it remains operated even after the ON/
OFF button has been pushed.
To stop its operation, push the ON/OFF button again.
Check code
The indoor Unit No. in which
the problem occurred.
67-EN 68-EN
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