Troubleshooting - Toshiba MML-UP0071H-E Installation Manual

Periodic Maintenance
For environmental conservation, it is strongly recommended that the indoor and outdoor units of the air conditioner
in use be cleaned and maintained regularly to ensure efficient operation of the air conditioner.
When the air conditioner 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.
Parts
Access from inspection opening and remove the access panel. Examine the heat
Heat exchanger
exchanger if there is any clogging or damages.
Fan motor Access from inspection opening and check if any abnormal noise can be heard.
Access from inspection opening and remove the access panel. Examine the fan if there
Fan
are any waggles, damages or adhesive dust.
Filter Go to installed location and check if there are any stains or breaks on the filter.
Access from inspection opening and remove the access panel. Check if there is any
Drain pan
clogging or drain water is polluted.
Maintenance List
Parts Unit
Heat exchanger Indoor / Outdoor
Fan motor Indoor / Outdoor
Filter Indoor
Fan Indoor
Air intake /
Indoor / Outdoor
discharge grilles
Drain pan Indoor
Ceiling panel, louvres Indoor
Exterior Outdoor
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Inspection method
Check (visual / auditory) Maintenance
Dust / dirt clogging,
Wash the heat exchanger when it is
clogged.
scratches
Take appropriate measures when
Sound
abnormal sound is generated.
• Wash the filter with water when it is
contaminated.
Dust / dirt, breakage
• Replace it when it is damaged.
• Replace the fan when vibration or balance
• Vibration, balance is terrible.
• Dust / dirt, appearance • Brush or wash the fan when it is
contaminated.
Fix or replace them when they are
Dust / dirt, scratches
deformed or damaged.
Dust / dirt clogging, drain Clean the drain pan and check the
downward slope for smooth drainage.
contamination
Wash them when they are contaminated or
Dust / dirt, scratches
apply repair coating.
• Rust, peeling of insulator
Apply repair coating.
• Peeling / lift of coat
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12

Troubleshooting

 Confirmation and check
If a problem occurs with the air
conditioner, the OFF timer indicator
alternately shows the check code and
the indoor Unit No. in which the
problem occurred.
 Troubleshooting history and confirmation
You can check the troubleshooting history with the following procedure if a problem occurs with the air conditioner.
(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.
Procedure
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.
1
• [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.
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).
CAUTION CAUTION
2
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.
After you have finished checking, push the ON/OFF
button to return to the regular mode.
3
• If the air conditioner 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.
Description of operation
1 2 3
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