Mitsubishi Mr. Slim Owners Manual: A Comprehensive Guide
Welcome! This manual provides essential guidance for operating and maintaining your Mitsubishi Electric Mr. Slim air conditioning system, ensuring optimal performance and longevity.
Mitsubishi Electric’s Mr. Slim series represents a pinnacle of air conditioning technology, renowned for its sophisticated design, energy efficiency, and quiet operation. These systems are engineered to provide exceptional comfort while minimizing environmental impact. The Mr. Slim range encompasses a diverse selection of models, catering to various applications – from residential spaces to commercial environments.
This series utilizes advanced inverter technology, allowing for precise temperature control and reduced energy consumption. Key features include individual airflow control, intelligent defrosting, and self-cleaning functions; Understanding the specific capabilities of your Mr. Slim unit is crucial for maximizing its benefits. This manual will guide you through the features, operation, and maintenance procedures specific to your model, ensuring years of reliable performance. Always refer to the installation manual for specific restrictions.
Understanding Your Unit: Model Numbers & Specifications
Decoding your Mr. Slim model number is the first step to understanding your system’s capabilities. The alphanumeric code provides vital information about the unit’s capacity, features, and intended application. Refer to Mitsubishi Electric’s official documentation or website to decipher the specific meaning of each character within your model number.
Key specifications to note include cooling and heating capacity (measured in BTU or kW), power consumption, refrigerant type, and operating voltage. These details are crucial for ensuring proper installation and operation. The technical and service manual provides detailed specifications for your specific model, including error codes. Always consult these resources for accurate information. Proper understanding of these specifications will aid in troubleshooting and maintenance.
Safety Precautions & Warnings
Prioritize safety! Before operating your Mr. Slim unit, carefully review these crucial precautions. Installation and service must be performed by qualified professionals, adhering strictly to the installation manual. Never attempt self-repair, as improper handling can lead to electric shock or system damage.
Disconnect the power supply before cleaning or performing any maintenance. Do not operate the unit with a damaged power cord or plug. Keep flammable materials away from the indoor and outdoor units. Ensure adequate ventilation around the outdoor unit. Be aware of potential refrigerant leaks and contact a qualified technician immediately if suspected. Always follow the guidelines outlined in both the operation and installation manuals to prevent hazards and ensure safe operation of your Mr. Slim system.

Operation & Control
Mastering your system is easy! This section details powering on/off, remote control functions, mode selection, fan speed, timer settings, and airflow direction.
Powering On/Off & Basic Operation
Initial Power-Up: Upon initial installation, ensure the unit is properly connected to a grounded power source. Press the main power button on the remote control; a confirmation light will illuminate on the indoor unit. To turn the unit off, simply press the power button again. Allow several minutes for the system to fully shut down.
Emergency Operation: In the event of remote control malfunction, locate the emergency on/off switch on the indoor unit itself. This allows for manual control. Remember to restore normal operation via the remote as soon as possible.
Operational Modes: The system defaults to automatic mode upon startup. Utilize the mode selection button on the remote to choose your desired setting – Cool, Heat, Dry, or Auto. Confirm the selected mode is displayed on the indoor unit’s display panel.

Initial Test Run: After powering on, perform a brief test run to verify proper functionality and airflow.
Remote Control Functions Explained
Key Buttons: The remote features a power button for on/off control, mode selection (Cool, Heat, Dry, Auto), fan speed adjustment (Auto, Low, Medium, High), and temperature setting (+/- buttons). A ‘Timer’ button accesses scheduling features. The ‘I-Save’ button, if equipped, optimizes energy usage.
Display Panel: The remote’s LCD displays the current mode, set temperature, fan speed, and timer status. Low battery indicator alerts you to replace the batteries (typically AAA size). Ensure clear line of sight between the remote and the indoor unit.
Advanced Functions: Explore buttons for ‘Quiet Mode’ and ‘Energy Saving Mode’ for customized comfort and efficiency. The ‘Airflow Direction’ button controls louver positioning. Refer to the full manual for detailed explanations of each function.
Resetting the Remote: If the remote malfunctions, try replacing the batteries. If issues persist, consult the troubleshooting section.
Mode Selection: Cool, Heat, Dry, Auto
Cool Mode: Activates cooling, reducing room temperature. Adjust the set temperature using the +/- buttons for desired comfort levels. Fan speed can be adjusted independently.
Heat Mode: Enables heating, warming the room. Similar to Cool Mode, set the desired temperature. Note that heating performance may vary depending on outdoor temperature.
Dry Mode: Dehumidifies the air, reducing humidity without significant temperature change. Ideal for damp climates. Fan speed is typically set to low in this mode.
Auto Mode: The unit automatically selects cooling or heating based on the room temperature, maintaining a comfortable environment. This mode optimizes energy efficiency. The system intelligently adjusts fan speed and temperature.
Mode Indicator: The selected mode is clearly displayed on both the indoor unit and the remote control.
Fan Speed Control & Airflow Direction
Fan Speed: Your Mr. Slim unit offers multiple fan speed settings – Auto, Low, Medium, High, and sometimes a specific “Quiet” setting. Adjust via the remote control for personalized airflow. Auto mode adjusts speed based on temperature difference.
Airflow Direction (Horizontal): Louvers on the indoor unit allow you to control the horizontal airflow direction. Direct air where it’s needed most, avoiding direct drafts. Use the remote’s swing function for automated movement.
Airflow Direction (Vertical): Many models also feature vertical airflow control, allowing you to adjust the angle of the louvers up or down. This ensures even distribution throughout the room.
Swing Function: Activate the swing function on the remote to automatically move the louvers, distributing air more evenly. You can often set the swing angle and speed.
Timer Settings: On/Off & Scheduled Operation
On Timer: Program your Mr. Slim to automatically turn on at a specified time. This is ideal for pre-cooling or pre-heating a room before you arrive home, maximizing comfort. Set the desired time using the remote control’s timer buttons.
Off Timer: Schedule your unit to automatically turn off after a set period. This helps conserve energy and ensures the system doesn’t run unnecessarily while you sleep or are away.
Scheduled Operation: Some models offer advanced scheduling, allowing you to set different on/off times for each day of the week. This provides greater control and energy savings. Refer to your model’s specific instructions.
Real Time Clock: Ensure the unit’s internal clock is accurately set for precise timer operation. Adjust the clock via the remote control’s settings menu.

Maintenance & Care
Regular upkeep is crucial for peak performance. Cleaning filters, coils, and the exterior ensures efficient operation and extends the lifespan of your Mr. Slim unit.
Air Filter Cleaning & Replacement
Maintaining clean air filters is paramount for optimal performance and air quality. Regularly inspect your Mr. Slim’s air filters – typically monthly – for dust and debris accumulation. A clogged filter restricts airflow, reducing cooling/heating efficiency and potentially damaging the unit.
Cleaning Procedure: Gently vacuum the filters to remove loose particles. For more stubborn dirt, wash them with mild detergent and lukewarm water, ensuring they are completely dry before reinstallation.
Replacement: Depending on usage and environmental conditions, filters may need replacing every 3-6 months. Refer to your model’s specific instructions for the correct filter type and replacement frequency. Using a damaged or incorrect filter can compromise system performance and void the warranty. Always power off the unit before filter maintenance.
Coil Cleaning Procedures
Maintaining clean coils – both the evaporator (indoor) and condenser (outdoor) – is crucial for efficient operation. Dirty coils reduce heat transfer, leading to decreased cooling/heating capacity and increased energy consumption. Caution: Disconnect power before any coil cleaning!
Evaporator Coil: Use a commercially available coil cleaner specifically designed for air conditioning units. Follow the product instructions carefully. Gently brush the coil fins to remove debris, avoiding bending them.

Condenser Coil: Remove any obstructions around the outdoor unit. Use a garden hose with a gentle spray nozzle to rinse the condenser coil from the inside out, removing dirt and leaves. Avoid high-pressure washing, which can damage the fins. Professional cleaning is recommended annually for optimal results.
Exterior Cleaning & Upkeep
Regular cleaning of your Mr. Slim unit’s exterior helps maintain its appearance and prevents corrosion. Use a soft, damp cloth and mild detergent to wipe down the indoor and outdoor unit casings. Avoid abrasive cleaners or solvents, as they can damage the finish.
Outdoor Unit: Keep the area around the outdoor unit clear of debris like leaves, grass clippings, and snow. Ensure adequate airflow by trimming nearby vegetation. Inspect the fan blades periodically for damage and remove any obstructions.
Indoor Unit: Dust the unit regularly with a soft cloth. For stubborn stains, use a slightly damp cloth with mild soap. Never spray water directly onto the unit. A clean exterior contributes to the longevity and efficient operation of your system.
Troubleshooting Common Issues
Unit Not Cooling/Heating: First, check the air filter – a dirty filter restricts airflow. Ensure the thermostat is set correctly and the desired mode (Cool/Heat) is selected. Verify power supply and circuit breaker status.
Error Codes: If an error code appears on the display, consult the Error Codes & Troubleshooting Guide section of this manual for specific solutions. Note the code before contacting support.
Water Leaks: Check the drain line for clogs. A blocked drain line can cause water to overflow. Strange Noises: Unusual sounds may indicate a mechanical issue; discontinue use and contact a qualified service technician. Always refer to the full manual for detailed diagnostics.

Advanced Features & Settings
Explore enhanced functionalities! Discover energy-saving modes, quiet operation, I-Save features, and wireless remote pairing options for personalized comfort and efficiency.
Energy Saving Modes & Eco Function
Maximize efficiency and reduce energy consumption with your Mr. Slim unit’s advanced energy-saving features. The Eco Mode intelligently adjusts cooling or heating output based on room occupancy and temperature fluctuations, minimizing wasted energy. This mode automatically optimizes fan speed and setpoint temperatures to maintain comfort while conserving power.
Furthermore, certain models incorporate intelligent sensors that detect human presence, further refining operation for unoccupied spaces. Explore the settings within your remote control to activate and customize these features. Regularly utilizing these modes not only lowers your electricity bills but also contributes to a more sustainable environment. Refer to your specific model’s documentation for detailed instructions on accessing and configuring these energy-saving options.
Quiet Mode Operation
Enjoy a peaceful environment with the Mr. Slim’s Quiet Mode, designed to minimize operating noise. This feature reduces fan speed and compressor activity, creating a virtually silent cooling or heating experience – ideal for bedrooms, nurseries, or home offices. Activating Quiet Mode through your remote control prioritizes silent operation, though it may slightly affect cooling or heating capacity.
The level of noise reduction varies depending on the specific model and settings. Some units offer multiple levels of Quiet Mode for customized comfort. Regularly cleaning the air filters and ensuring proper unit maintenance will also contribute to quieter operation. Consult your model’s manual for specific instructions on enabling and optimizing Quiet Mode for your needs, ensuring a tranquil indoor climate.
I-Save Mode (If Applicable)
I-Save Mode, available on select Mr. Slim models, intelligently optimizes energy consumption while maintaining comfortable temperatures. This feature learns your usage patterns and automatically adjusts cooling or heating output to anticipate your needs, reducing energy waste. It works by pre-cooling or pre-heating the room before scheduled times, minimizing the strain on the compressor during peak demand.
To activate I-Save Mode, refer to your remote control and the unit’s operation manual. The system will then automatically manage temperature settings based on learned preferences. While offering significant energy savings, I-Save Mode may require an initial learning period to establish optimal performance. Check your specific model’s documentation to confirm availability and understand its unique functionalities.
Wireless Remote Control Pairing

Pairing your wireless remote to the Mr. Slim unit is crucial for seamless operation. If the remote isn’t responding, or you’ve replaced it, re-pairing is necessary. Begin by ensuring the indoor unit has power. Locate the pairing button – often a small, recessed button on the indoor unit itself – and press it. Simultaneously, press and hold the ‘Check’ and ‘Reset’ buttons on the remote control for several seconds.
The indoor unit should emit a beep or display a signal indicating pairing mode. Continue holding the remote buttons until the unit confirms successful pairing with another beep. Refer to your specific model’s manual for precise button locations and pairing procedures, as they can vary. A successful pairing allows full control of all unit functions via the remote.

Technical Information & Service
Detailed specifications, error codes, and interface details are provided for both users and qualified service professionals to diagnose and maintain the Mr. Slim system.
Technical Specifications (Capacity, Power Consumption)
Understanding your unit’s technical details is crucial for efficient operation and informed maintenance. The capacity of your Mr. Slim unit, measured in BTUs (British Thermal Units), determines its cooling and heating power. This varies significantly based on the model – for example, PU-P18VAKD offers a specific capacity, while PU-P42YAKD provides a larger output.
Power consumption, expressed in Watts, is another key specification. Refer to your model’s specific data plate (usually located on the indoor or outdoor unit) for precise values. These specifications are also detailed in the accompanying installation and service manuals. Knowing these figures allows for accurate energy usage calculations and helps optimize settings for cost-effectiveness. Always consult the official documentation for the most accurate and up-to-date information regarding your specific Mr. Slim model.
Error Codes & Troubleshooting Guide
Encountering an error? Your Mitsubishi Mr. Slim unit utilizes a diagnostic system that displays error codes to indicate potential issues. These codes, detailed in the service manual, provide valuable clues for troubleshooting. Common problems might include issues with the refrigerant, fan motor, or sensor malfunctions.
Before contacting support, consult the error code list to attempt a simple fix – often, resetting the unit can resolve minor glitches. However, complex issues require professional attention. Never attempt to disassemble or repair internal components yourself, as this could void your warranty and pose safety risks. The installation manual and service handbook offer detailed guidance for qualified technicians. Always prioritize safety and refer to official documentation for accurate diagnosis and repair procedures.
Connecting to Local Applications (Interface Details)
Integration with smart home systems? Mitsubishi Mr. Slim units can interface with local applications for enhanced control and monitoring. This typically involves connecting the outdoor unit to a compatible control system via a designated interface. Careful consideration of restrictions outlined in the installation manual is crucial during setup.
The interface allows for remote operation, data logging, and integration with building management systems. Designers should thoroughly review the technical specifications to ensure compatibility and proper communication protocols. Service personnel must understand these connections for effective diagnostics and maintenance. Detailed information regarding interface parameters, wiring diagrams, and communication protocols are available in the technical documentation and service handbook.
Installation Manual Reference (Important Notes)
Professional installation is key! The installation manual contains critical information for qualified technicians. Always refer to it for detailed instructions regarding refrigerant handling, electrical connections, and proper unit placement. Ignoring these guidelines can void the warranty and compromise system performance.
Ensure the outdoor unit is installed on a stable, level surface with adequate clearance for airflow and servicing. Pay close attention to local codes and regulations regarding electrical wiring and refrigerant piping. The manual emphasizes the importance of a leak test after installation and proper insulation of refrigerant lines. Both the installation and operation manuals must be provided to the end-user for future reference and safe operation.
Service Handbook Overview (For Professionals)
Designed for qualified technicians, the service handbook details advanced troubleshooting, component testing, and repair procedures for the Mr. Slim series. It’s crucial service personnel thoroughly review both the operation and installation manuals before any service work begins. The handbook provides comprehensive error code explanations, aiding in swift diagnosis of system malfunctions.
Detailed schematics, wiring diagrams, and parts lists are included to facilitate efficient repairs. Special attention is given to refrigerant circuit analysis and compressor diagnostics. The handbook also outlines procedures for specialized functions and interface connections. Remember to consult the handbook for restrictions and specific details related to each Mr. Slim model, ensuring accurate and safe service practices.

Resources & Support
Need assistance? Access downloadable manuals online, contact Mitsubishi Electric support directly, or register your warranty for exclusive benefits and prompt service.
Downloading Manuals Online
Accessing Your Manuals is Easy! Mitsubishi Electric provides a comprehensive online resource for downloading owner’s manuals, technical guides, and service handbooks for your Mr. Slim air conditioning unit. Visit The Manual Library or the official Mitsubishi Electric website to locate the specific documentation for your model number.
You can find manuals in PDF format, offering convenient viewing and printing options. Search by model series (like PEAD) or directly input your unit’s complete model number for precise results. These digital resources include installation manuals, operation manuals, and detailed service information.
Ensure you have the correct manual for your specific Mr. Slim system to understand all features, safety precautions, and troubleshooting steps. Regularly check for updated versions as Mitsubishi Electric may release revisions to improve clarity or add new information. Downloading provides immediate access to vital support materials.
Contacting Mitsubishi Electric Support
Need Assistance? We’re Here to Help! For direct support regarding your Mitsubishi Mr. Slim air conditioner, reach out to Mitsubishi Electric’s dedicated customer support team. While specific contact details may vary by region, their official website provides comprehensive contact information, including phone numbers and email addresses.

You can often find localized support options tailored to your country or area. Mitsubishi Electric prioritizes customer satisfaction and offers assistance with troubleshooting, warranty claims, and locating authorized service professionals.
Before contacting support, having your model number and purchase date readily available will expedite the process. Don’t hesitate to utilize their resources for any questions or concerns regarding your Mr. Slim system’s operation or maintenance. Prompt and reliable support is a key benefit of choosing Mitsubishi Electric.
Warranty Information & Registration
Protect Your Investment! Your Mitsubishi Mr. Slim air conditioner is backed by a comprehensive warranty, safeguarding against potential defects in materials and workmanship. The specific warranty duration and coverage details depend on the model and your region, so carefully review the warranty documentation included with your unit.
Prompt registration of your Mr. Slim system is crucial to activate the full warranty benefits. This typically involves submitting a registration form online through the Mitsubishi Electric website or mailing in a physical registration card.
Retain your proof of purchase, as it’s required for any warranty claims. Understanding your warranty terms ensures peace of mind and access to authorized service if needed. Registering your unit also allows Mitsubishi Electric to keep you informed about important updates and promotions.
















































































