Mitsubishi Electric MJ-E152AF-H Instruction Manual page 27

Check to see if the unit is on a slope or uneven surface which
causes the unit to tilt or wobble.
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Move to a safe and even surface.
Check to see if the pre-filter is clogged.
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Clean according to the methods specified in the "Maintenance"
section.
Operating the unit on a wood board or in a small room is likely to
cause acoustic resonance.
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Placing a soft mat underneath the unit can reduce the acoustic
resonance.
Sound increases when the compressor starts operation.
(Approximately three minutes after turning on the unit, or during
INTELLIGENT LAUNDRY and AUTO operation.)
The volume of the sound differs depending on the louvre angle.
This is the sound of the refrigerant flow.
The sound can be heard when the unit is turned on, operation
mode is changed or operation stops. No sound can be heard
when the refrigerant flow stabilizes.
This is the sound of the compressor when it starts up.
In AUTO mode, the compressor operates intermittently, so there is compressor startup
sound. The compressor does not start when the operation ends or until 3 minutes has
passed after the unit is turned on. This is to protect the compressor from damage.
The temperature of heat exchanger goes up rapidly, causing transient odor.
The discharged moisture may emit an odor. It is common that the
silver ion filter cannot eliminate all the odors and the odors can
be absorbed by moisture inside the unit.
Stop operation and contact Mitsubishi Electric Service Centre.
Check to see if the power cord is plugged properly.
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Correctly plug the power cord into the power socket.
Check to see if anything is blocking the air outlet.
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Remove the obstruction and plug the power cord into the power socket again.
Check to see if the pre-filter is clogged.
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Clean according to the "Maintenance" procedures.
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