Carrier 40MBFAQ User manual

Specifications subject to change without notice.
TABLE OF CONTENTS
PAGE
A NOTE ABOUT SAFETY ........................................................................................................................2
GENERAL...................................................................................................................................................2
PARTS .........................................................................................................................................................3
WIRELESS REMOTE CONTROL.............................................................................................................4
REMOTE CONTROL .................................................................................................................................6
REMOTE CONTROL FUNCTIONS..........................................................................................................8
CLEANING, MAINTENANCE AND TROUBLESHOOTING ..............................................................13
TROUBLESHOOTING.............................................................................................................................15
NOTE TO EQUIPMENT OWNER:
Please read this Owner’s Information Manual carefully before installing and using this appliance and
keep this manual for future reference.
For your convenience, please record the model and serial numbers of your new equipment in the spaces
provided. This information, along with the installation data and dealer contact information, will be
helpful should your system require maintenance or service.
UNIT INFORMATION
Model # _______________________________
Serial # ________________________________
INSTALLATION INFORMATION
Date Installed ___________________________
DEALERSHIP CONTACT INFORMATION
Company Name: ______________________
Address:_____________________________
Phone Number:________________________
Technician Name:______________________
Owner’s Manual
40MBFAQ
Floor Console Ductless System
Size 12K

40MBFAQ: Owner’s Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
2
A NOTE ABOUT SAFETY
Any time you see this symbol in manuals, instructions and on the unit, be
aware of the potential for personal injury.
There are 3 levels of precaution :
DANGER identifies the most serious hazards which results in severe
personal injury or death. WARNING signifies hazards that could result in
personal injury or death. CAUTION is used to identify unsafe practices
which could result in minor personal injury or product and property
damage.
NOTE is used to highlight suggestions which results in enhanced
installation, reliability, or operation.
GENERAL
The floor console fan coil unit provides quiet, maximum comfort.
In addition to cooling and/or heating, the floor console fan coil unit
matched with an outdoor condensing unit filters and dehumidifies the air
in the room to provide maximum comfort.
IMPORTANT: The floor console fan coil unit should be installed by
authorized personnel only; using approved tubing and accessories. If
technical assistance, service or repair is needed, contact the installer.
The floor console fan coil unit can be set up and operated from the remote
control (provided). If the remote is misplaced, the system can be operated
from the AUTO setting on the unit.
Operating Modes
The floor console unit has five operating modes:
• FAN Only
• AUTO
•HEATING
•COOLING
• DEHUMIDIFICATION (DRY)
FAN Only
In the FAN Only mode, the system filters and circulates the room air
without changing room air temperature.
AUTO
In the AUTO mode, the system automatically cools or heats the room
according to the user-selected set point.
NOTE: AUTO mode is recommended for use on single zone
applications ONLY. Using AUTO CHANGEOVER on multi-
zone applications could set an indoor unit to STANDBY mode,
indicated with two dashes (--) on the display, which will turn off
the indoor unit until all the indoor units are in the same mode
(COOLING or HEATING). HEATING is the system's priority
mode. Simultaneous HEATING and COOLING is not allowed.
HEATING
In the HEATING mode, the system heats and filters the room air.
COOLING
In the COOLING mode, the system cools, dries and filters the room air.
DEHUMIDIFICATION (DRY)
In DEHUMIDIFICATION mode, the system dries, filters and slightly
cools the room air temperature. This mode prioritizes air
dehumidification but it does not take the place of a dehumidifier.
Wireless Remote Control
The remote control transmits commands to set up and operate the system.
The control has a window display panel that displays the current system
status. The control can be secured to a surface when used with the
mounting bracket provided.
Wired Remote Control (Optional)
Refer to the Wired Controller manual.
24V Interface (Optional)
Allows the control of the Ductless System with a third party thermostat.
PERSONAL INJURY, DEATH AND / OR PROPERTY
DAMAGE HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock,
or other conditions which may cause personal injury or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The
qualified installer or service agency must use factory−authorized
kits or accessories when modifying this product.
Read and follow all instructions and warnings, including labels
shipped with or attached to unit before operating your new air
conditioner.
WARNING

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3
PARTS
Fig. 1 — Parts
• when Wireless Control feature is activated
Drain hose
Refrigerant
connecting
pipe
Display panel
Air inlet (air filter installed)
Air flow louver (at air outlet)
Air flow louver (at air outlet)
Display panel
•
Displays temperature and Error codes:
“ ” when defrosting
“ ” for 3 seconds when:
• TIMER ON is set
• SWING or SILENCE is turned on
“ ” for 3 seconds when:
• TIMER OFF is set
• SWING or SILENCE is turned o
“ ” when unit is self-cleaning
“ ” when 46.4° F/ 8° C heating feature is turned on
• When ECO function is activated

40MBFAQ: Owner’s Manual
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4
WIRELESS REMOTE CONTROL
Before you begin using your new air conditioner, familiarize yourself with the remote control.
Fig. 2 — Remote Controller Function Buttons
NOTE: New remote controller starting on production of week 10 year 2021 (serial number 1021V17181). For advanced functions, refer to the
RG10B(B1)/BGEFU1 Wireless Remote Controller’s Service Manual.
ON/OFF
Turns the unit on or off. MODE
OK
TIMER
HUMIDITY
LED
BOOST
ECO/GEAR
Scrolls through operation modes
as follows: AUTO
J COOL J
DRY JHEAT JFAN
FAN SPEED
SWING
Increases temperature in
1°F (0.5°C) increments.
Max. temperature is
86°F (30°C).
NOTE: Press together &
buttons at the same time
for 3 seconds alternates
the temperature display
between the °F and °C.
TEMP
TEMP
Use to confirm the selected functions.
Decreases temperature
in 1 F°(0.5° C) increments.
Min. temperature is
OO
60 F(16 C).
Turns indoor unit’s LED display
and air conditioner buzzer on
and off, which creates a comfortable
and quiet environment.
Adjust the room humidity during the
Dry mode in a range of 35%~85%.
Press to increase the humidity in
5% increments.
NOTE: After setting, the humidity
settings appear on the screen.
NOTE: If the floor console is
matched with a multi zone outdoor
unit or if a wired controller is used,
the humidity sensor is not active.
Set timer to turn unit on or off
Humidity
Press to enter the energy efficient
mode in the following sequence:
ECO GEAR(75%)
GEAR(50%)
mode ECO 
Selects fan speeds in the
following order:
AU
J
J
20%
60%40% 80% 100%.
JJ J
Press the TEMP or button
to increase/decrease the fan
speed in 1% increments. Enables unit to reach preset
temperature in shortest possible time.
Boost
Previous setting
SET
Scrolls through operation
functions as follows:
The selected symbol flashes
on the display area, press
OK to confirm.
Starts and stops the horizontal
louver movement. Hold down
for 2 seconds to initiate vertical
louver auto swing feature.
BREEZE AWAY
This feature avoids direct air flow
blowing on the skin
Sleep( )
Follow Me( ) AP mode
J
J
J
J
.......
Fresh( )
( ) clean( )
Active
Active
J
clean( )

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5
WIRELESS REMOTE CONTROL LCD SCREEN INDICATORS
Fig. 3 — Wireless Remote Controller Indicators
Transmission Indicator
MODE display
TIMER ON display
FAN SPEED display
TIMER OFF display
Silence feature
display
ECO display
GEAR display
LOCK display
Horizontal louver
swing display
Vertical louver auto
swing display
TURBO mode display
Temperature/Timer/Fan speed
display
Active clean feature display
Fresh feature display
Sleep mode display
Follow me feature display
Wireless control feature display
Low battery detection display(If flashes)
Displays when LOCK feature
is activated.
Silence
LOW
MED
HIGH
AUTO
Lights up when remote
sends signal to indoor
unit
Displays selected fan speed:
Displays the current
including:
mode,
2%-20%
21%-40%
41%-60%
61%-80%
81%-100%
1%
This fan speed can not be
adjusted in
AUTO or DRY
mode.
Displays when ECO
feature is activated
Displays when GEAR
feature is activated
Displays the set temperature
by default, or fan speed or
timer setting when using
TIMER ON/OFF functions.
Temperature range:
o
o
oo
16-30 C
60-86 F/
Timer setting range:
0-24 hours
Fan speed setting range:
Humidity setting range:
AU -100%
35% -85%
This display is blank when
operating in FAN mode.
JJ
JJJ
(68-82 F/20-28 C)
(Model dependent)
Breeze Away display

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6
REMOTE CONTROL
IMPORTANT: The wireless remote control can operate the unit from a
distance of up to 26 ft. (8 m) as long as there are no obstructions.
NOTE: If a wireless remote controller is used, relocate the IR
(Infrared) receiver within the line of sight of the remote
location using the 6 ft. cable (included). The factory location
of the IR receiver is inside the control box. An authorized
technician should perform this work.
When the timer function is used, the remote control should be kept in the
vicinity of the unit (within 26 ft. (8 m).
The remote control can perform the following basic functions:
• Turn the system ON and OFF
• Select the operating mode
• Adjust room air temperature set point and fan speed
Refer to the “WIRELESS REMOTE CONTROL” on page 4 for a
detailed description of all the capabilities of the remote control.
Battery Installation
Two AAA 1.5v alkaline batteries (included) are required to operate the
remote control.
To install or replace batteries:
1. Slide the back cover off the control to open the battery compartment.
2. Insert the batteries. Follow the polarity markings inside the battery
compartment.
3. Replace the battery compartment cover.
NOTES:
1. When replacing batteries, do not use old batteries or a different
type of battery. This may cause the remote control to malfunction.
2. If the remote is not going to be used for several weeks, remove the
batteries. Otherwise, battery leakage may damage the remote
control.
3. The average battery life under normal use is about 6 months.
4. Replace the batteries when there is no audible beep from the
indoor unit or if the Transmission Indicator fails to light.
5. When batteries are removed, the remote control erases all
programmed settings. The control must be reprogrammed after
the insertion of new batteries.
Remote Control Operation - Quick Start
NOTE: When transmitting a command from the remote control to
the unit, be sure to point the control toward the right side of
the unit. The unit confirms receipt of a command by
sounding an audible beep.
1. Turn the unit on by pushing ON/OFF.
NOTE: If there is a preference for °C rather than °F (default),
press and hold TEMP or TEMP together for approximately
3 seconds.
2. Select the desired mode by pushing MODE.
Fig. 4 —Modes
3. Select the temperature set point by pointing the control toward the unit
and pressing the increase/decrease temperature set point buttons until
the desired temperature appears on screen.
4. Press FAN to select the desired fan speed.
NOTE: If the unit is operating in DRY or AUTO mode, the fan speed
will be automatically set.
5. Set the airflow direction. When the unit is turned on, the Up-Down
airflow louvers default to the cooling or heating position. The user can
adjust the horizontal Up-Down airflow louver position by pushing
DIRECT or have continuous louver movement by pressing SWING.
Manual Operation
If the remote control is lost, damaged, or the batteries are exhausted,
MANUAL can be used to run the unit. When MANUAL is pressed once, the
AUTO mode takes affect (heat or cool). When this button is pressed twice,
the system enters the TEST mode and runs for 30 minutes in the COOLING
mode (it will run in the
AUTO mode afterward). When pressed three times,
the system turns OFF .
Fig. 5 — Manual Button
The set conditions of manual operation are as follows:
• Preset set point: 76°F (24°C)
• Fan speed: AUTO
• Discharge air direction: Pre-set position based on operation in the
COOL or HEAT mode
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage. Handle the
control with care and avoid getting the control wet.
CAUTION
AUTO COOL DRY
HEAT
FAN

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7
BASIC REMOTE CONTROL OPERATION
Before operation, ensure the unit is plugged in and power is available.
COOL Mode
Fig. 6 — COOL Mode
1. Press MODE to select the COOL mode.
2. Set your desired temperature using TEMP or TEMP .
3. Press FAN to select the fan speed in a range of AU‘100%,
4. Press ON/OFF to start the unit.
Setting Temperature
The operating temperature range for units is 60-86°F (16-30°C)/(68-82 °F
(20-28°C) (depends on model). You can increase or decrease the set
temperature in 1°F (0.5°C) increments.
HEAT Mode
Fig. 7 — HEAT Mode
1. Press MODE to select the HEAT mode.
2. Set your desired temperature using TEMP or TEMP .
3. Press FAN to select the fan speed in the range of AU-100%.
NOTE: As the outdoor temperature drops, the performance of your
unit’s HEAT function may be affected. In such instances, we
recommend using this air conditioner in conjunction with
other heating appliances.
AUTO Mode
In AUTO mode, the unit automatically selects the COOL, FAN, or
HEAT operation based on the set temperature.
Fig. 8 — AUTO Mode
1. Press MODE to select AUTO.
2. Set your desired temperature using TEMP or TEMP .
3. Press ON/OFF to start the unit.
NOTE: FAN Speed can not be set in the AUTO mode.
1
3
2
4
Humidity
Boost
1
3
2
4
Humidity
Boost
1
3
2
Humidity
Boost

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8
DRY Mode
Fig. 9 — DRY Mode
1. Press MODE to select the DRY mode.
2. Set your desired temperature using TEMP or TEMP .
3. Press ON/OFF to start the unit.
FAN Mode
Fig. 10 — FAN Mode
1. Press MODE to select the FAN mode.
2. Press FAN to select the fan speed in the range of AU-100%.
3. Press ON/OFF to start the unit.
REMOTE CONTROL FUNCTIONS
Press ON/OFF
When the air conditioner is not in operation, the remote control displays
the last set point and mode.
• Press ON/OFF to start the unit
- The unit starts in the last operating mode and set point. The ON/
OFF indicator appears.
• Press ON/OFF to stop the unit
- All the indicator lights on the unit go out, and the remote control
displays the set point and mode.
NOTE: If ON/OFF is pressed too soon after a stop, the compressor
will not start for 3 to 4 minutes due to the inherent protection
against frequent compressor cycling. The unit only emits an
audible beep when the signals are received correctly.
Selecting an Operating Mode
Use OPERATING MODE to select one of the available modes.
Fig. 11 — Operating Modes
Setting the Room Temperature Set Point
Press TEMP or TEMP to raise or lower the temperature. The unit
confirms the signal receipt with a beep and the value of the set
temperature appears on the display and changes accordingly. The
temperature can be set between 62°F (17°C) and 86°F (30°C) in
increments of 1°F or 1°C.
NOTE: In the COOLING mode, if the temperature selected is higher
than the room temperature, the unit will not start. The same
applies for the HEATING mode if the selected temperature is
lower than the room temperature.
Selecting the Fan Speed
Fig. 12 — Fan Speeds
Press FAN to select the fan speed.
NOTE: When the unit is on, the fan runs continuously in cooling or
heating. When in heating, there might be situations where
the fan will slow down or shut off to prevent cold blow.
1
3
2
Humidity
Boost
1
3
2
Humidity
Boost
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
Handle the controller with care and avoid getting it wet.
CAUTION
AUTO LOW MED
HIGH

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9
Selecting the Up-Down Airflow Louver Position
To optimize comfort, the horizontal louver should be adjusted to the
desired position.
When COOLING
Adjust the up-down airflow louver downwards or horizontally (see Fig. 13).
Fig. 13 — Cooling Airflow
When HEATING
Adjust the up−down airflow louver vertically (see Fig. 14).
Fig. 14 — Heating Airflow
The horizontal up−down airflow louvers can be adjusted by pressing
DIRECT on the remote controller. Press SWING to set the louvers to a
stationary position or to move continuously. The up−down airflow louver
position is stored in the settings, however it is deactivated when the
TURBO or MANUAL settings are set, or when a power interruption
takes place.
Air Direction
Press DIRECT repeatedly to choose one of the up−down airflow
louver positions. Every time DIRECT is pushed, the specific louver
swings 30 degrees.
In the COOLING, DEHUMIDIFICATION, and FAN ONLY modes,
the up−down airflow louver swings in the cooling range.
In the HEATING mode, the louver swings in the heating range.
NOTE: Always use the remote controller to adjust the up−down
airflow louver position, otherwise abnormal operation may
occur. If the horizontal louver is manually adjusted out of its
range, power the unit off and then back on again.
Auto Swing
For automatic horizontal up−down airflow louver swing, press SWING.
Fig. 15 — Louver Up-Down Swing

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10
Selecting Right−Left Direction of the Louver
The right-left louvers can be adjusted manually to direct the airflow to
achieve optimal comfort in the space. A knob can be found on the right
side and the left side of the louvers.
Fig. 16 — Louver Right-Left (Size 12)
AIRFLOW SELECTION
1. Open the front panel.
2. Make the airflow selection that best suits you. When setting the air flow
selection, use the Dual Air Flow icon (see Fig. 17).
Fig. 17 — Dual Air Flow
NOTE: The air conditioner automatically determines the
appropriate blowing pattern based on the operating mode or
situation.
Table 1 — Operating Mode
Fig. 18 — Air Blows from Upper and Lower Outlets
Air is blown from the upper air outlet during the DRY mode, so cold air
does not come into direct contact with people.
Do not adjust the up−down airflow louver by hand. When
adjusting by hand, the mechanism may not operate properly or
condensation may drip from the air outlets.
CAUTION
OPERATING
MODE COOL MODE HEAT MODE
Situation
When the room
totally cools, or
when one hour
has passed since
turning on the air
conditioner
At operation
start or other
times when
the room is
not totally
cooled.
At times
other than
below
(normal time)
At the start or
when the air
temp. is low.
Blowing Pattern
So air does not
come into direct
contact with
people, air is
blown from the
upper air outlet,
and the room
temp. is equalized.
Air is blown from the upper
and lower air outlets for high
speed cooling during the
COOL mode, and for filling
the room with warm air
during the HEAT mode (see
Fig. 18).
To keep air
from coming
into direct
contact with
occupants,
air blows
from the
upper air
outlet.
Before opening the front panel be sure to stop the operation and
turn the breaker OFF.
Do not touch the metal parts on the inside of the indoor unit, as it
may result in injury.
CAUTION

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11
When Setting the Air Outlet Selection Switch to Single Air
Flow
Fig. 19 — Single Air Flow
• Regardless of the operating mode or situation, air blows from the
upper air outlet.
• Use this switch when you do not want air coming from the lower air
outlet; for example while sleeping.
NOTE: Lower air outlet only available on size 12.
Timer Function
TIMER ON (to start the unit) and TIMER OFF (to stop the unit) can be
used separately or together.
Timer ON Only
This function allows the unit to start automatically at the set time. The
TIMER ON function can be set while the unit is on or off.
Unit On
1. Press TIMER ON to initiate the auto-on time sequence. The set time is
displayed in the remote control display. Every time TIMER ON is
pressed, the time increases by 30 minutes, up to 10h. It increases by 60
minutes, afterwards, until the time setting reaches 24h.
2. When the TIMER ON is set, the TIMER light on unit illuminates.
The unit continues to run at the set time.
Unit Off
1. Set the timer described in the UNIT ON section. The unit starts at the
set time.
2. Adjust the TIMER ON settings to 0.0 to cancel this option.
Timer OFF Only
This function allows the unit to stop automatically at the set time. The
timer can be set while the unit is on or while it is off.
Unit On
Press TIMER OFF to initiate the auto-off time sequence. The set time
appears on the remote control display. Every time TIMER OFF is
pressed, the time increases by 30 minutes, up to 10h. It increases by 60
minutes, afterwards, until the time settings reach 24h.
When the TIMER OFF is set, the timer light on the unit illuminates and
the unit turns off automatically at the set time.
Unit Off
1. Set the TIMER OFF as described in the UNIT ON section. The
TIMER display on the unit illuminates and the unit remains off.
2. Adjust the TIMER ON settings to 0.0 to cancel this option.
Timer ON and Timer OFF
Use both functions to program the unit to turn on and shut off at specified
times.
Unit Off
1. Set TIMER ON as previously described.
2. Set TIMER OFF as previously described. The unit starts
automatically at the set TIME ON and turns off at the set TIME OFF.
Unit On
1. Set TIME OFF as previously described.
2. Set TIME ON as previously described. The unit turns off
automatically at the set TIME OFF and turns on at the set TIME ON.
SLEEP Mode
SLEEP mode is used to conserve energy. The mode can be used when the
unit is in the COOL, HEAT or AUTO mode only.
HEATING Mode
Same as the COOLING mode however the set points are lowered by 1.8°F
(1°C).
COOLING Mode
Push SLEEP. After 1 hour the set point raises by 1.8°F (1°C). After
another hour, the set point raises by another 1.8°F (1°C) and the fan runs
in a low speed. The unit shuts off 5 hours after setting the SLEEP mode.
SLEEP mode cancels if either MODE, TEMP, FAN, TIMER, or ON/
OFF on the remote control is pressed.
TURBO Mode
Use TURBO to cool or heat the room rapidly.
1. Press TURBO. An audible “beep” is heard if the indoor unit supports
this function. The fan runs on super high speed. The TURBO mode
terminates automatically 20 minutes after selecting TURBO.
2. To cancel TURBO, select TURBO mode again. When the TURBO
mode terminates, the unit reverts to the original setting.

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12
SILENCE Mode
NOTE: The SILENCE Mode (SLC) is not available on this model.
LED Light
Press LED to turn the display light on and off.
Resetting the Remote Control
If the batteries in the remote control are removed, the current settings are
erased and the control returns to the initial settings and enters the
STANDBY mode. Push ON/OFF to activate.
Time Delay
If ON/OFF is pressed too soon after a stop, the compressor will not start
for 3 to 4 minutes due to the inherent protection against frequent
compressor cycling. The unit only emits an audible beep when the signals
are received correctly.
Heating Features
If the unit is in the HEATING mode, there is a delay when the fan starts.
The fan starts only after the coil is warmed up to prevent cold blow.
Auto Defrost Operation
In the HEATING mode, if the outdoor coil is frosted, the indoor fan and
outdoor fan turns off while the system removes the frost from the outdoor
coil. The system automatically reverts to normal operation when frost is
removed from the outdoor unit.
Auto Start
If the power fails while the unit is operating, the unit stores the
operating condition, and the unit will start operation automatically under
those conditions when the power is restored.

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13
CLEANING, MAINTENANCE AND TROUBLESHOOTING
Periodic Maintenance
Periodic maintenance is recommended to ensure proper operation of the unit.
Recommended maintenance intervals may vary depending on the installation
environment, e.g., dusty zones, etc. Refer to Table 2 on page 15.
Cleaning the Coil
Clean the coil at the beginning of each cooling season, or when necessary.
Use a vacuum cleaner or a long-bristle brush to avoid damage to the coil
fins.
Cleaning the Air Filters
Remove and clean the air filters once a month. A clogged air conditioner
can reduce the cooling efficiency of your unit, and can also be bad for
your health.
NOTE: If air filters show signs of excessive wear or are torn, they
must be replaced. Contact your local dealer for replacement
filters.
1. Open the front panel.
Fig. 20 — Open the front panel
2. Remove the air filter.
Fig. 21 — Remove the air filter
3. Remove the carbon filter. Hold the frame’s tabs and remove the four
claws. The carbon filter can be renewed by washing it with water once
every 6 months.
NOTE: The manufacturer recommends that the carbon filter be
replaced every year.
Fig. 22 — Carbon Filter
4. Clean the air filter. A vacuum cleaner or pure water may be used to
clean the air filter. If the dust accumulation is excessive, please use a
soft brush and mild detergent to clean it and dry out in cool place.
IMPORTANT: The air-in side should face up when using vacuum
cleaner. The air-in side should face down when using water.
5. Set the air filter and the carbon filter as they were and close the front
panel. Operating the unit without the air filters may result in equipment
damage or even failure as dust will accumulate inside the indoor unit.
ELECTRICAL SHOCK HAZARD
Failure to follow this caution may result in personal injury or
death. Always turn off power to the system before performing any
cleaning or maintenance to the system. Turn off the outdoor
disconnect switch located near outdoor unit. Be sure to disconnect
the indoor unit if on a separate switch.
CAUTION
EQUIPMENT DAMAGE/OPERATION HAZARD
Failure to follow this caution may result in equipment damage or
improper unit operation.
Operating the system with dirty air filters may damage the indoor
unit and could cause reduced cooling performance, intermittent
system operation, frost build-up on indoor coil or blown fuses.
CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury. The coil
fins are very sharp. Use caution when cleaning.
Always wear safety protection.
CAUTION
Air Outlet
Selection Switch
Carbon Filter
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage. When
cleaning the front panel, do not use water hotter than 105 ° F (40.6 ° C)
and do not pour water onto the fan coil.
Do not use abrasive or petroleum based cleaners as they may damage
the front panel.
CAUTION

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14
Indoor Unit Front Panel
To clean the front panel on the indoor unit, wipe the outside with a soft,
dry cloth.
Preparing for Extended Shutdown Period
Clean the filters and reposition them in the unit. Operate the unit in FAN
ONLY mode for 12 hours to dry all internal parts. Turn the main power
supply off and remove batteries from the remote control.
System Operation Recommendations
The items outlined in the following list help to assure proper system
operation:
•Replace both remote control batteries at the same time.
• Point the remote control toward the unit display panel when
transmitting a command.
• Keep doors and windows closed while unit is operating.
• Contact an authorized service representative if a problem arises that
cannot be easily resolved.
• Do not perform cleaning or maintenance activities while the unit is on.
• Keep the display panel on the unit away from direct sunlight and heat
as this may interfere with remote control transmissions.
• Do not block air intakes and outlets on the indoor or outdoor units.
Energy Saving Recommendations
The following recommendations will add greater efficiency to the
ductless system:
• Select a comfortable thermostat setting and leave it at chosen setting.
Avoid continually raising and lowering the setting.
• Keep the filter clean. Frequent cleaning may be necessary depending
on indoor air quality.
• Use drapes, curtains or shades to keep direct sunlight from heating the
room on very hot days.
• Limit the unit’s run time by using the TIMER function.
• Do not obstruct the air intake on the front panel.
• Turn on the air conditioning unit before the indoor air becomes too
uncomfortable.

40MBFAQ: Owner’s Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
15
TROUBLESHOOTING
Refer to Table 3 before contacting your local dealer.
Table 2 — Periodic Maintenance
* Increase frequency in dusty zones.
†Maintenance to be carried out by qualified service personnel. Refer to the Installation Manual.
Common Problems
Table 3 — Common Problems
* Diagnostic lights are a combination of lights that will illuminate in the display area on the unit. They are a combination of the lights you see during normal operation.
INDOOR UNIT EVERY MONTH EVERY 6 MONTHS EVERY YEAR
Clean Air Filter* ··
Replace Carbon Filter ·
Change Remote Control Batteries ·
OUTDOOR UNIT EVERY MONTH EVERY 6 MONTHS EVERY YEAR
Clean Outdoor Coil from Outside ·
Clean Outdoor Coil from Inside† ·
Blow Air Over Electric Parts† ·
Check Electric Connection Tightening† ·
Clean Fan Wheel† ·
Check Fan Tightening† ·
Clean Drain Pans† ·
PROBLEM POSSIBLE CAUSE SOLUTION
Unit/System Does Not Work
The circuit breaker has tripped or a fuse has
blown.
Reset the circuit breaker or replace the fuse with the specified
replacement fuse.
Power failure Restart the operation when the power is restored.
Diagnostic lights illuminate.* Call your service representative
Voltage is too low. Call your service representative.
Unit stops during operation The OFF timer is not operating correctly. Restart the operating mode.
Diagnostic lights illuminate Call a service representative for service

© 2023 Carrier. All rights reserved.
Edition Date:01/23 Catalog No: OM-40MBFAQ-01
Replaces: NEW
40MBFAQ: Owner’s Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
16
Table 4 — Troubleshooting
PROBLEM POSSIBLE CAUSES SOLUTION
Poor Cooling Performance
Temperature setting may be higher than
ambient room temperature Lower the temperature setting
The heat exchanger on the indoor or
outdoor unit is dirty Clean the affected heat exchanger
The air filter is dirty Remove the filter and clean it according to instructions
The air inlet or outlet of either unit is
blocked Turn the unit off, remove the obstruction and turn it back on
Doors and windows are open Ensure all doors and windows are closed while operating the unit
Excessive heat is generated by sunlight Close windows and curtains during periods of high heat or bright sunshine
Too many sources of heat in the room
(people, computers, electronics, etc.) Reduce amount of heat sources
Low refrigerant due to leak or long-term
use Check for leaks, re-seal if necessary and top o refrigerant
Poor Heating Performance
The filter is blocked with dust. Clean the filter.
The temperature is set too low. Check the temperature and reset if necessary.
A window or door is open Ensure all the doors and windows are closed while operating the unit.
The outdoor unit is obstructed. Turn the unit off, remove the obstruction and turn the unit back on.
The unit is not working
Power failure Wait for the power to be restored
The power is turned off Turn on the power
The fuse is burned out Replace the fuse
Remote control batteries are dead Replace batteries
The unit’s 3-minute protection has been
activated Wait three minutes after restarting the unit
Timer is activated Turn timer off
The unit starts and stops
frequently
There’s too much or too little refrigerant in
the system Check for leaks and recharge the system with refrigerant.
Incompressible gas or moisture has
entered the system. Evacuate and recharge the system with refrigerant
System circuit is blocked Determine which circuit is blocked and replace the malfunctioning piece of
equipment
The compressor is broken Replace the compressor
The voltage is too high or too low Install a manostat to regulate the voltage
Poor heating performance
The outdoor temperature is extremely low Use auxiliary heating device
Cold air is entering through doors and
windows Make sure that all doors and windows are closed during use
Low refrigerant due to leak or long-term
use Check for leaks, re-seal if necessary and top off the refrigerant
Indicator lamps
continue flashing
The unit may stop operation or continue to run safely. If the indicator lamps continue to flash or error codes appear, wait
for about 10 minutes. The problem may resolve itself. If not, disconnect the power, then connect it again. Turn the unit
on. If the problem persists, disconnect the power and contact your nearest customer service center.
Error code appears and
begins with the letters
as the following in the
window display of
indoor unit:
E(x), P(x), F(x)
EH(xx), EL(xx), EC(xx)
PH(xx), PL(xx), PC(xx)