Mitsubishi Electric PUZ-ZM60VHA2, Service Manual

Page: 59 / 140

59
OCH771
Phone Calls From Customers How to Respond Note
The room cannot be cooled or heated
sufficiently.
1
Check the set temperature of remote controller.
The outdoor unit cannot be operated if the set
temperature is not appropriate.
The outdoor unit operates in the following modes.
COOL: When the set temperature is lower than the
room temperature.
HEAT: When the set temperature is higher than the
room temperature.
—
2
Check if filters are not dirty and clogged. If filters are
clogged, the airflow amount will be reduced and the unit
capacity will be lowered. See the instruction manual
that came with the product for how to clean the filters.
—
3
Check there is enough space around the air
conditioner.
If there are any obstacles in the air intake or air outlet of
indoor/outdoor units, they block the airflow direction so
that the unit capacity will be lowered.
—
Sound
comes out
from the air
conditioner.
1
A gas escaping sound
is heard sometimes.
1
This is not a malfunction.
This is the sound when the flow of refrigerant in the air
conditioner is switched.
—
2
A cracking sound is
heard sometimes.
2
This is not a malfunction.
This is the sound when internal parts of units expand or
contract when the temperature changes.
—
3
A buzzing sound is
heard sometimes.
3
This is not a malfunction.
This is the sound when the outdoor unit starts
operating.
—
4
A ticking sound is heard
from the outdoor unit
sometimes.
4
This is not a malfunction.
This is the sound when the fan of the outdoor unit
is controlling the airflow amount in order to keep the
optimum operating condition.
—
5
A sound, similar to
water flowing, is heard
from the unit.
5
This is not a malfunction.
This is the sound when the refrigerant is flowing inside
the indoor unit.
—
Something
is wrong
with the
blower…..
1
The fan speed does
not match the setting of
the remote controller
during DRY operation.
(No air comes out
sometimes during DRY
operation.)
1
This is not a malfunction.
During the DRY operation, the blower’s ON/OFF is
controlled by the microprocessor to prevent overcooling
and to ensure efficient dehumidification. The fan speed
cannot be set by the remote controller during DRY
operation.
—
2
The fan speed does
not match the setting of
the remote controller in
HEAT operation.
2
This is not a malfunction.
1) When the HEAT operation starts, to prevent the unit
from blowing cold air, the fan speed is gradually
increased from zero to the set speed, in proportion
to the temperature rise of the discharged air.
2) When the room temperature reaches the set
temperature and the outdoor unit stops, the unit
starts the LOW AIR operation.
3) During the HEAT operation, the DEFROST operation
is performed to defrost the outdoor unit. During
the DEFROST operation, the blower is stopped to
prevent cold air coming out of the indoor unit.
The up/down vane will
be automatically set to
horizontal blow in these
cases listed up on the
left (
1
–
3
). After a while,
the up/down vane will
be automatically moved
according to the setting of
the remote controller.
3
Air blows out for a while
after HEAT operation is
stopped.
3
This is not a malfunction.
The blower is operating just for cooling down the
heated-up air conditioner. This will be done within 1
minute.
This control is conducted only when the HEAT
operation is stopped with the electric heater ON.
However, this control is
also applied to the models
which has no electric
heater.