haier AE122BCAAA (H2EM-18H03) - Manual (Page 13)

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Check if there are any obstacles in the air inlet and outlet
of indoor and outdoor unit to avoid the working
efficiency drop.
Please do install the air filter and insure it is not dirty.
Otherwise, the unit is damaged or has trouble due to
the dust entry into the unit.
In heating, in order to protect the compressor in starting the unit, please switch
on the power switch of the unit 12 hours in advance before using it, and in
using season, please always keep the power switch in ON state.
Please check first
Maintenance
When maintaining, do turn off the manual power switch.
Daily cleaning
Clean air conditioner and wire controller
Maintenance after the using season
In a sunny day and FAN mode, let the unit operate about half a day to make
the inner part of the unit dry.
Turn off the operation switch of the air conditioner, cut off the power switch.
Otherwise, even the air conditioner is in OFF state, it will consume certain
power.
Clean the air filer and the system of indoor unit, wash and clean the outdoor
unit, and use dustcoat to cover the unit.
Maintenance before the using season
Use soft cloth to dry clean
If there is too much dirt on the air conditioner panel,
please soak the cloth with water, and then clean it.
(The wire controller cannot use water to clean, it
should use dry cloth to clean.)
It is forbidden to use gasoline, diluent, eradicator
powder and chemical dishcloth etc. to clean,
otherwise it may cause deformation and crack.