Mitsubishi MSZ09UN Operating Instructions Manual page 26

Question
Mechanical sound is
heard from the
indoor unit.
The air flow
direction changes
during operation.
Water leaks from the
outdoor unit.
Air does not blow
out soon in the
heating operation.
The operation is
stopped for about
10 minutes in the
heating operation.
Hissing sound is
sometimes heard.
The air conditioner
starts the operation
only with the main
power turned on,
though you do not op-
erate the unit with the
remote controller.
Answer (not a malfunction)
I This is the switching sound in turning on/off the fan or
the compressor.
I When the air conditioner is operated in COOL or DRY
mode, if the operation continues with air blowing down
for 1 hour, the direction of the air flow is automatically set
to horizontal to prevent condensed water from dropping.
I In the heating operation, if the air flow temperature is
too low or when defrosting is being done, the horizon-
tal vane position is automatically set to horizontal.
I During COOL and DRY operations, pipe or pipe con-
necting sections are cooled and this causes water to
condense.
I In the heating operation, the defrosting operation makes
water frozen on the outdoor unit melt and drip down.
I In the heating operation, water condensed on the heat
exchanger drips down.
I Please wait as the air conditioner is preparing to blow
out warm air.
I Defrosting of the outdoor unit is being done (Defrost-
ing operation).
Since this is completed in 10 minutes, please wait.
(When the external temperature is too low and humid-
ity is too high, frost is formed.)
I This is the sound when the flow of refrigerant inside
the air conditioner is switched.
I These models are equipped with an auto restart func-
tion. When the main power is turned off without stop-
ping the air conditioner with the remote controller and
is turned on again, the air conditioner will start opera-
tion automatically in the same mode as the one set
with the remote controller just before the shutoff of
the main power.
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