How to Use the MRCOOL Zone Controller: A Comprehensive Hands-On Guide

The MRCOOL zone controller, also known as the remote control, is a crucial component of the MRCOOL DIY Ductless Mini Split system. It allows users to precisely control the indoor unit, offering a range of advanced features that enhance user experience and energy efficiency. This comprehensive guide delves into the intricate details of how to effectively utilize the MRCOOL zone controller, providing a hands-on approach for DIY enthusiasts.

Basic Functions

The MRCOOL zone controller features an On/Off button that powers the unit on or off. The temperature up and down buttons adjust the temperature in one-degree increments, with the ability to toggle between Fahrenheit and Celsius by holding down the temperature button for three seconds.

Mode Settings

how to use MRCOOL zone controller

The mode button on the MRCOOL zone controller allows users to cycle through various settings, including Auto, Cool, Dry, Heat, and Fan. Each mode offers unique functionalities and performance characteristics:

  • Auto Mode: Automatically selects the optimal cooling or heating mode based on the ambient temperature, ensuring maximum comfort and energy efficiency.
  • Cool Mode: Provides precise temperature control for cooling the indoor environment, with the ability to set the desired temperature between 62°F (17°C) and 86°F (30°C).
  • Dry Mode: Reduces humidity levels in the room, helping to create a more comfortable and dehumidified atmosphere.
  • Heat Mode: Enables efficient heating, with the temperature range adjustable between 62°F (17°C) and 86°F (30°C).
  • Fan Mode: Circulates the air without cooling or heating, allowing for improved air circulation and ventilation.

The fan button on the MRCOOL zone controller allows users to set the fan speed to Auto, Low, Medium, or High, depending on their preference and the desired airflow.

Sleep Function

The sleep button on the MRCOOL zone controller is designed for use when going to bed. In Cool mode, the unit automatically increases the temperature by 2°F (1°C) after the first hour and another 2°F (1°C) after the second hour, gradually adjusting the temperature to provide a more comfortable sleeping environment. Conversely, in Heat mode, the unit decreases the temperature by 2°F (1°C) after the first hour and another 2°F (1°C) after the second hour. The unit will then turn off after seven hours, ensuring energy efficiency and a restful night’s sleep.

Turbo and Self-Clean Function

The MRCOOL zone controller features a Turbo function that allows the unit to reach the preset temperature at cooling or heating operation in the shortest possible time. This is particularly useful when you need to quickly cool or heat a space.

The Self-Clean function is another valuable feature of the MRCOOL zone controller. This mode automatically cleans and dries the evaporator, keeping it fresh and ready for the next operation, thus maintaining optimal performance and air quality.

Silence/FP Function

The Silence button on the MRCOOL zone controller operates the compressor at a low frequency, reducing noise levels and creating a quieter indoor environment. Holding the Silence button for two seconds enables the Freeze Protection (FP) mode, which can only be activated within the Heat setting. The FP mode helps protect the unit from potential damage caused by freezing temperatures.

Timer Function

The Timer button on the MRCOOL zone controller allows users to set the unit to turn on or off at a specific time. Each press of the button increases the auto time setting in 30-minute increments. When the setting time displays 10, each press increases the auto time setting by 60-minute increments, providing greater flexibility in scheduling the unit’s operation.

Swing/Direct Function

The Swing/Direct button on the MRCOOL zone controller adjusts the airflow direction. Pushing the Swing button causes the airflow to oscillate, ensuring even distribution of conditioned air throughout the room. Pushing the Direct button sets the airflow to a fixed direction, allowing users to target specific areas as needed.

Advanced Features

The MRCOOL zone controller also includes advanced features that enhance user experience and energy efficiency:

  1. Follow Me Function: This feature displays the temperature of the area where the remote is located and sends a signal to the air conditioner every three minutes. The unit will then activate when the temperature drops below the set point in Auto mode, ensuring the desired comfort level is maintained.
  2. Wireless Connectivity: Some MRCOOL zone controllers feature wireless connectivity, allowing users to control the unit remotely via a smartphone app or voice commands (e.g., Amazon Alexa, Google Assistant).
  3. Energy-Saving Modes: The zone controller may offer specialized energy-saving modes, such as Eco mode, which optimizes the unit’s performance to minimize energy consumption without compromising comfort.
  4. Advanced Diagnostics: The zone controller may provide advanced diagnostic capabilities, enabling users to monitor the system’s performance, identify any issues, and troubleshoot problems more effectively.

Common Issues and Troubleshooting

While the MRCOOL zone controller is generally reliable, users may occasionally encounter some common issues:

  • Remote Not Working: If the remote control is not functioning properly, the first step is to replace the batteries. If the issue persists, it may indicate a problem with the remote itself, and you may need to contact MRCOOL customer support for further assistance.
  • Spotty App Connectivity: For units with wireless connectivity, users may experience intermittent issues with the smartphone app. This can be due to various factors, such as network connectivity, device compatibility, or app software updates. Ensure that your Wi-Fi network is stable and that the app is up-to-date.

Warranty and Customer Service

MRCOOL offers excellent customer service and honors their warranty on the zone controller and other components of the DIY Ductless Mini Split system. However, it’s important to note that the warranty only covers the parts, and the customer is responsible for the shipping fees. If a part fails within the warranty period, MRCOOL will send a replacement, but the customer must cover the cost of shipping the new part.

By thoroughly understanding the features and functionalities of the MRCOOL zone controller, DIY enthusiasts can maximize the efficiency and performance of their MRCOOL DIY Ductless Mini Split system, ensuring a comfortable and energy-efficient indoor environment.


  1. How to use the MrCool DIY Ductless Mini Split Remote –
  2. How to Use the Remote for the MR COOL DIY Ductless Mini Split –
  3. How to Use the Remote for the MR COOL DIY Ductless Mini Split – YouTube
  4. Things I wish I knew before installing MrCool Minisplits – Reddit
  5. How to Install the MRCOOL Smart Controller – YouTube