Mitsubishi Electric Mr.SLIM MSH24WN Operating Instructions Manual page 28

BLE HAS OCCURRED
Question
The operation is
stopped for about
10 minutes in the
heating operation.
Hissing sound is
sometimes heard.
The room cannot
be heated
sufficiently.
The swing
operation of the
VERTICAL VANE is
suspended for
about 15 seconds,
then restarted.
The air conditioner
starts the operation
only with the main
power turned on,
though you do not
operate the unit
with the remote
controller.
Answer (not a malfunction)
■ 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.)
■ This is the sound when the flow of refrigerant inside
the air conditioner is switched.
■ When the outside air temperature is low, the heating
effect may not be sufficient.
■ This is for the swing operation of the VERTICAL VANE
to be performed normally.
■ This model is equipped with an auto restart function.
When the main power is turned off without stopping
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.