Maintenance; Troubleshooting - Toshiba MMW-UP0271LQ-E Installation Manual

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.
Parts
Access from inspection opening and remove the front panel. Check if there is any clogging or drain
Drain pan
water is polluted.
▼Maintenance List
Part Unit
Heat exchanger Outdoor
Fan motor Outdoor
Air inlet / outlet grilles Outdoor
Drain pan Hot water module
Hot water module /
Exterior
Outdoor
Water pipes Hot water module
Strainer Hot water module
Air vent valve Hot water module
It recommends that a pump and a strainer are maintained periodically.
67-EN
Inspection method
Check (visual / auditory) Maintenance
Wash the heat exchanger when it is
Dust / dirt clogging, scratches
clogged.
Take appropriate measures when
Sound
abnormal sound is generated.
Fix or replace them when they are
Dust / dirt, scratches
deformed or damaged.
Dust / dirt clogging, drain Clean the drain pan and check the
contamination downward slope for smooth drainage.
• Rust, peeling of insulator
Apply repair coating.
• Peeling / lift of coat
Rust, leakage
Checking
Evidence of leakage
Dust / dirt clogging Checking
Air entrainment Checking an air vent valve
13

Troubleshooting

 Confirmation and check
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.
 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.
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
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.
• If the air conditioner (including the Hot water module)
3
is operating, it remains operated even after the ON/
OFF button has been pushed.
To stop its operation, push the ON/OFF button again.
– 34 –
Check code The indoor Unit No. in which
the problem occurred.
Description of operation
1 2 3
68-EN