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Portable Air Conditioner
Owner’s Manual Nestfair LMS288454A Portable Air Conditioner



Our powerful portable air conditioners are great cooling solutions for single rooms, creating a comfortable atmosphere in your space. It also has ventilation and dehumidifying function for circulating air and removal of moisture. They’re self-contained systems that do not require any permanent installation allowing you to move to the space in which it is most needed. They’re commonly used in kitchens, temporary-resided, computer rooms, garages, and many other places where installation of Air-conditioner Outdoor Units is limited.


  • This household appliance is intended for use in domestic environments and should not be used for other purposes.
  • This appliance can be used by children aged 8 years and above and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning the use of the appliance in a safe way and understand the hazards involved. Children shall not play with the appliance. Cleaning and user maintenance shall not be made by children without supervision.
  • The refrigerant loop is sealed. Only a qualified technician should attempt to service!
  • Do not discharge the refrigerant into the atmosphere. It collects first in low areas but can be circulated by the fans.


Your safety is the most important thing we are concerned about! 

warning 4
Please read this manual carefully and fully understand before operating your appliance.


  • If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or similarly qualified persons in order to avoid a hazard.
  • The appliance shall be disconnected from its power source during service.
  • Always operate the unit from a power source of equal voltage, frequency, and rating as indicated on the product identification plate.
  • Always use a power outlet that is grounded.
  • Unplug the power cord when cleaning or when not in use.
  • Do not operate with wet hands. Prevent water from spilling onto the unit.
  • Do not immerse or expose the unit to rain, moisture or any other liquid.
  • Do not leave the unit running unattended. Do not tilt or turn over the unit.
  • Do not unplug while the unit is operating.
  • Do not unplug by pulling on the power cord.
  • Do not use an extension cord or an adapter plug.
  • Do not put objects on the unit.
  • Do not climb or sit on the unit.
  • Do not insert fingers or other objects into the air outlet.
  • Do not touch the air inlet or the aluminum fins of the unit.
  • Do not operate the unit if it is dropped, damaged or showing signs of product malfunction.
  • Do not clean the appliance with any chemicals.
  • The unit shall be installed in accordance with national wiring regulations.
  • Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer.
  • The appliance shall be stored so as to prevent mechanical damage from occurring.
  • Do not pierce or burn, even after use.
  • Be aware that refrigerants may not contain an odor.
  • Compliance with national gas regulations shall be observed.
  • Keep any required ventilation openings clear of obstruction.



Nestfair LMS288454A Portable Air Conditioner - DIAGRAM

1 Control Panel 4 Power Cord 6 Air Exhaust
2 Air Outlet With Adjustable Louver 5 Recessed Handle 7 Drain Opening With Sealing Plug
3 Air Inlet

Note: The picture shown above is for illustration purposes only. The actual product may vary due to product enhancement.


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BOSCH 600861902 Keo Cordless Universal Cutters - icon11 Temperature setting and display
BOSCH 600861902 Keo Cordless Universal Cutters - icon11LED Digital display
BOSCH 600861902 Keo Cordless Universal Cutters - icon11 Electronic control with a built-in timer, sleep mode
BOSCH 600861902 Keo Cordless Universal Cutters - icon11 Self-evaporating system for better efficiency
BOSCH 600861902 Keo Cordless Universal Cutters - icon11 Auto shut off when the tank is full
BOSCH 600861902 Keo Cordless Universal Cutters - icon11 Automatic restart in the event of a power outage
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BOSCH 600861902 Keo Cordless Universal Cutters - icon11 2-speed fan
BOSCH 600861902 Keo Cordless Universal Cutters - icon11 Casters for easy mobility


  • Unpack the carton and take the appliance and accessories out.
  • Inspect the device after unpacking for any damage or scratches.
  • Accessories:
  • 1. Exhaust Hose
  • 2. Hose Connector
  • 3. Window Kit Adapter
  • 4. Remote Control
  •  5. Window kit

Nestfair LMS288454A Portable Air Conditioner - UNPACKING


  • If tipped more than 45°, allow the unit to set upright for at least 24 hours before start-up.
  • Place the unit on a firm, level surface in an area with at least 20 inches of free space around it to allow for proper air circulation.
  • Do not operate in close proximity to walls, curtains, or other objects that may block the air inlet and outlet. Keep the air inlet and outlet free of obstacles.
  • Never install the unit where it could be subject to:

Nestfair LMS288454A Portable Air Conditioner - LOCATION

  • Heat sources such as radiators, heat registers, stoves or other products that produce heat.
  • Direct sunlight
  • Mechanical vibration or shock
  • Excessive dust
  • Lack of ventilation, such as cabinet or bookcase
  • Uneven surface

The air conditioner requires being vented outside so that the exhaust air can escape the room which coming from the appliance contains waste heat and moisture. Do not replace or extend the exhaust hose which will result in decreased efficiency, even worse shut down the unit due to low back pressure.
Step 1: Connect the hose connector to one end of the exhaust hose.

Nestfair LMS288454A Portable Air Conditioner - Step 1

Step 2: Connect the windows kit adapter to the other end of the exhaust hose.Nestfair LMS288454A Portable Air Conditioner - Step2

Step 3: Extend the adjustable window kit the length of your window. Connect the exhaust hose to the window kit.Nestfair LMS288454A Portable Air Conditioner - Step3

Step 4: Close your window to secure the kit in place. It needs to hold the windows kit firmly in place. Secure the window kit with duct tape if required.
It is recommended that the gap between the adapter and the sides of the window should be sealed off for maximum efficiency.
Nestfair LMS288454A Portable Air Conditioner - Step4Step 5: Attach the hose connector to the exhaust air outlet of the unit.
Nestfair LMS288454A Portable Air Conditioner - Step5Step 6: Adjust the length of the flexible exhaust hose, and avoid bends in the hose. Then place the unit near an electrical outlet.
Nestfair LMS288454A Portable Air Conditioner - Step6Step 7: Adjust the louver at the air outlet, and then switch on the unit.



Nestfair LMS288454A Portable Air Conditioner - PANEL

1. Power (Led) Press to switch the machine on or off.
2. Mode Press to switch the operation mode between cool, fan, and dry.
3. Indicators The corresponding indicator light illuminates to indicate the current mode setting.
4. Add/Down Add/Reduce desired temperature (61°F ∼90°F/1EC ∼32°C) or timer setting.
5. Indicators Indicate the current fan speed (high & low)
6. Timer Sets a time for the unit to automatically start or stop.
7. Fan Press to switch the fan speed between HIGH and LOW
8. Digital Display Displays timer setting and room temperature.

Start-up and Shutdown

  • Press POWER to turn the unit on. The unit runs in FAN mode as default.
  • Press the MODE button to select the desired operation mode.
  • Press POWER again to turn off the power.

Operation Mode
The unit has 4 operation modes: Cool, dry, fan, and sleep. The corresponding indicator light will illuminate to indicate the current mode setting.

  • Air Conditioning Mode (Cool)

Select the cool mode to lower the temperature in your room. Press Up/Down to adjust the temperature which is displayed on the screen. The temperature can be set between 61°F~90°F/16℃~32℃.
Press the Speed button to choose desired fan speed. To control the direction of the airflow horizontally, please adjust the inner louver by hand.
Note: The air conditioner stops if the room temperature is lower than the selected temperature.

  • Fan Mode (Fan)
    For air circulation without air conditioner cooling. Press the Speed button to choose desired fan speed.
  • Dehumidifying Mode (Dry)
    The user should connect the hose to the drain outlet for continuous drainage.
    Note: In this mode, fan speed is preset to low, and cannot be adjusted.
  • Sleep Mode (this function can only be used with remote control) The sleep mode can be activated when in cool mode.
    When Sleep Mode is activated in Cool Mode, the set temperature will increase by 1°F/1 ℃ after the first hour of cooling and will increase a further 1°F/1 ℃ after the second hour of cooling. The unit will maintain this temperature after 2 hours of cooling.


Nestfair LMS288454A Portable Air Conditioner - REMOTE

Timer Control
The timer is adjustable between 1 – 24 hours.

Auto Turn Off (When power on) Press the Timer key to turn on the timer function. Press Up/Down to select the auto OFF time.
Auto Turn On (When power off) Press the Timer key to turn on the timer function. Press Up/Down to select the auto ON time.
Cancel timer Press Up/Down repeatedly until the LED shows ‘00’.
Note: Press POWER will also exit the timer setting.

Automatic Defrost
At low room temperatures, frost may build up at the evaporator, and the air conditioner will, at some point during operation, perform an auto “defrost” cycle. Some owners feel that this is a fault because the unit isn’t performing as well as it should. Defrosting is a normal part of the operation, and is not a fault with the product. The unit will automatically start defrosting and the POWER light flashes. The defrost control sequence is as follows:
When the compressor runs for more than 20 minutes, the temperature sensor begins measuring the temperature. Defrost starts when the temperature sensor senses a  temperature ≤34°F/1℃ for 3 minutes, the compressor stops working, the fan runs at high speed, and the power light flashes. When the temperature is detected ≥45°F/7℃, the unit will automatically stop the defrosting. The compressor restarts in 3 minutes, and the temperature sensor begins measuring again.

Overload Protection
After a power outage, it takes 3 minutes for the compressor to restart.

Self-Evaporating System
The self-evaporating system uses the collected water to cool the condenser coils for better efficient performance. There is no need to empty the drainage tank in Cool Mode except in Dry Mode and high humidity conditions. The condensate water evaporates at the condenser or through the exhaust hose. For continuous operation or unattended operating in Dry Mode, please connect the attached drain hose to the unit. Condensate water will automatically flow into a bucket or drain by gravity.

• Unplug the unit from the power source.
• Remove the plug of the water outlet opening, and keep it in a safe area. Some residual water may spill so please have a pan to collect the water.
• Connect the drain hose securely and make sure it is not kinked and clear of obstruction.
• Place the outlet of the hose over a floor drain or bucket. Make sure that water could flow out of the unit freely.
• Do not submerge the end of the hose into the water; otherwise it can cause an “Air Lock” in the hose.
Nestfair LMS288454A Portable Air Conditioner - power

To avoid water spillage:

  • As the negative pressure of the condensate drain pan is large, tilt the drain hose down toward the floor. It is best that the degree of inclination should exceed 20 degrees.
  • Do not bend the hose. A bent hose will block water and cause the unit to malfunction or shut off.


The air filter is to be cleaned every two weeks to maintain a cleaner environment and air-cooling efficiency. It is removable for easy cleaning. Do not operate the unit without an air filter, or the evaporator may be contaminated.

  1. Press the POWER button to switch off the unit and unplug the unit.
  2. Remove the filter from the unit.
  3. Use a vacuum cleaner to remove dust from the filter.
  4. Gently wash using running water, rinse thoroughly and let the water run through the filter in the opposite direction of airflow. Set aside and allow the filter to air dry completely before reinstalling.

Nestfair LMS288454A Portable Air Conditioner - Pic1

DO NOT touch the evaporator surface with bare-hand. Doing so can cause serious injury.

General Measures:

  1. Gas/vapor is heavier than air and can collect in low-lying areas, particularly at or below ground level.
  2. Identify and eliminate all possible ignition sources.
  3. Use appropriate personal protective equipment (PPE).
  4. Keep out unnecessary and unprotected personnel. Isolate and ventilate the area.
  5. Do not get in eyes, on the skin, or on clothing. Do not breathe vapors or gas.
  6. Prevent entry into sewers and public waters.
  7. Stop the source of the release, if safe to do so. Consider the use of water spray to disperse vapors.
  8. Isolate the area until gas has dispersed. Ventilate and gas test area before entering. Contact competent authorities after a spill.


Symptom Inspection Solution
The unit does not operate. ✓Power plug is not properly plugged in. Insert the power cord securely into the outlet.
✓Check if the water is full? Empty the drain pan by removing the rubber plug.
✓Check the room temperature. The range of operating temperature is 41-95°F.
The unit works with reduced capacity. I Check the air filter for dirt. > Clean the air filter as necessary.
✓Check if the air duct is blocked. > Clear the obstacle.
✓Check if the room door or window is open. Keep the door and windows closed.
✓Check if the desired operating mode is selected and the temperature is properly set. Set the mode and temperature at the proper set-point according to the manual.
✓The exhaust hose is detached. Make sure the exhaust hose is securely attached.
Water Leakage ✓Overflow while moving the unit.  Empty the water tank before transport.
✓Check if the drain hose is kinked or bends.  Straighten the hose to avoid a trap existing.
Excessive Noise ✓Check if the unit is securely positioned. Place the unit on firm and level ground.
✓Check if any loose, vibrating parts. > Secure and tight the parts.
✓Noise sounds like water flowing.  Noise comes from flowing refrigerant. This is normal.
EO ✓Communication faults between main PCB and display PCB. Check the wire harness of the display PCB for damage. Contact the seller first.
El ✓Ambient temperature sensor failure > Check connection or replace it. To clean or replace the temperature sensor. Contact the seller first.
E2 ✓Coil temperature sensor failures.
Ft ✓Condensate water high-level alarm. Empty the drain pan by removing the rubber plug.


If the unit will not be used for a long time (more than a few weeks), be sure to clean the unit, and drain the left-over water condensation completely. Please store the unit per the following steps:

  1. Unplug the unit, and remove the exhaust hose and window kit. Store them with the unit.
  2. Drain the remaining water from the unit.
  3. Remove the air filter and clean it with water. Dry the air filter and then reinstall.
  4. The unit must be kept in an upright position when in storage.
  5. Store the machine in a cool, dry place, away from direct sunlight and corrosive gas.

The evaporator inside the machine has to be dried out before the unit is packed to avoid component damage and molds. Unplug the unit and place it in a dry open area for days to dry it out. Another way to dry the unit is to turn on the machine, adjust it to low-speed fan mode, and maintain this state until the drainage pipe becomes dry, so as to keep the inside of the body in a dry state and prevent it from mildewing.

Warning WARNING!!!
Releasing refrigerant into the atmosphere is strictly forbidden!
Dustbin Do not dispose of electrical appliances as unsorted municipal waste, in particular household waste. Contact your local government for information regarding the collection systems available. If electrical appliances are disposed of in landfills or dumps, hazardous substances can leak into the groundwater and get into the food chain, damaging your health and well-being.

Documents / Resources

Nestfair LMS288454A Portable Air Conditioner [pdf] Owner's Manual
LMS288454A Portable Air Conditioner, LMS288454A, Portable Air Conditioner

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