For Wired Remote Controller - Mitsubishi Electric Mr.Slim PUH-P25VGAA Service Manual

[for wired remote controller]

Before you call out a repair man, check the following table to see whether there is a simple solution to your problem.
Problem
The room neither gets cool nor
warm very much.
The unit does not blow air out right
away in the heating mode.
The unit stops operating before
arriving at the set temperature in
the heating mode.
The airflow direction suddenly
changes.
Air direction doesn't move
(change).
(Up/down vane, left/right louver)
When changing the airflow direc-
tion, the vanes make at least a
complete rotation before stopping
in place.
There is a "swishing" noise that
occurs from the unit when water
flows.
Unit occasionally makes a gurgling
sound.
Unit occasionally thuds.
Outdoor unit occasionally rattles.
Solution
Clean the filter. (Dust and rebris
that collects in the filter will
decrease air-flow.)
Check the temperature setting and
adjust it if necessary.
Increase the space surrounding
the outdoor unit.
Is the air intake or air outlet
blocked?
Is a window or door open?
The unit is preparing to deliver
warm air.
Frost forms when the outdoor tem-
perature is low and humidity is
high.
Wait for about 10 minutes for the
frost to melt.
After one hour of cooling-mode
operation with the airflow in a
downward direction, the unit will
automatically change to the
"Horizontal air-flow" mode. This is
to prevent any moisture that may
have collected from dripping.
When the unit is in the heating or
defrosting mode, it will automati-
cally change to the "Horizontal air-
flow mode".
The vanes will go through a test
run before they situate into the
specified angle.
1) Check whether the vane has
been set to a fixed position (check
whether the vane motor connector
has been removed).
2) Check whether the unit has a
function for switching the air direc-
tion. If the unit doesn't have this
function, "FUNCTION DOESN'T
EXIST" appears when you press
the remote control's UP/DOWN
VANE or LOUVER button.
The vanes will go through a test
run before they situate into the
specified angle
This sound is made when refriger-
ant inside of the unit is flowing or
refilling.
Not an error. This sound is caused
by the flow of the refrigerant in the
air conditioner being switched.
Not an error. This sound is emitted
when the air conditioner (outdoor
unit) starts operating.
Not an error. This sound is caused
by the blower air volume control
that the outdoor unit performs to
maintain the optimum operation
status.
Problem
A ticking noise is heard from
inside of the unit.
An odour is detected in the room.
A white mist is expelled from the
indoor unit.
Water or moisture is expelled
from the outdoor unit.
The indicators of the remote con-
troller do not light up when oper-
ated.
CENTRALLY CONTROLLED indi-
cator is displayed in the remote
controller.
The start and stop functions are
not available just after restarting
the unit.
Fan speed doesn't match set fan
speed during DRY operation.
(Sometimes no air comes out dur-
ing DRY operation.)
Fan speed doesn't match set fan
speed during HEAT operation.
(Sometimes no air comes out dur-
ing HEAT operation.)
Air sometimes comes out when
operation is stopped after HEAT
operation.
47
Solution
This sound is made when internal
parts of the unit expand or contract
when the temperature changes.
This is caused when the unit
expels odours that have been
absorbed from the walls, carpets,
furniture or clothing.
This may occur just after the unit is
turned on when a high level of
humidity is present in the room.
This occurs to expel water or mois-
ture that may have collected in the
pipes or around piping fixtures.
This occurs to dispel water from
the heat exchanger.
Turn on the power switch " • " will
be displayed.
The start and stop function of the
remote controller are not available
when the CENTRALLY CON-
TROLLED indicator is displayed.
Wait about three minutes (opera-
tion has stopped to prevent dam-
age to the air conditioner).
Not an error.
During the DRY operation, blower
ON/OFF is controlled by a micro-
processor to prevent overcooling
and to ensure efficient dehumidifi-
cation. The fan speed can't be set
by the remote controller during
DRY operation.
Not an error.
1). When the HEAT operation
starts, to prevent the unit from
emitting cold air, the fan speed is
gradually increased from zero to
the set speed, in proportion to the
temperature rise of the air emitted.
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 melt the frost adhering to the
outdoor unit. During the DEFROST
operation, the blower is stopped to
prevent cold air coming from the
indoor unit.
Not an error.
The blower operates to eliminate
the residual heat in the heated air
conditioner. It stops after about 1
minute. This operation is performed
when operation is stopped with the
electric heater ON.