Understanding the Double Dash Error on Mr. Cool Air Conditioner

How Much Clearance Must Be Left Around Outdoor HVAC Unit?

Key Takeaways:

Decode the mystery behind the Mr. Cool Air Conditioner double dash error with our guide. Unravel the causes, troubleshoot effectively, and prevent future issues to keep your cooling system running smoothly. Explore the essentials in this concise article.

Understanding the Double Dash Error on Mr. Cool Air Conditioner

Encountering a double dash error on the display of your Mr. Cool air conditioner can be a cause for concern. However, decoding the meaning behind this error is crucial for prompt troubleshooting and resolution. This article aims to elucidate the significance of the Mr. Cool Air Conditioner double dash error and provide potential solutions.

Interpreting the Double Dash Error:

The manifestation of a double dash error on a Mr. Cool air conditioner typically indicates a breakdown in communication between the indoor and outdoor units. Various factors may contribute to this error, including:

1. Loose or damaged wiring connections
2. Malfunctioning control board
3. Issues with the temperature sensor

When communication breaks down between the indoor and outdoor components, it can adversely affect the overall performance and efficiency of the air conditioning system.

Guidelines for Troubleshooting Mr. Cool Double Dash Error:

If you encounter the double dash error on your air conditioner, follow these detailed troubleshooting steps:

1. Inspect Wiring Connections:

  • Thoroughly examine the wiring connections between the indoor and outdoor units.
  • Look for loose or damaged wires by checking for visible wear, fraying, or disconnections.

Inspect Wiring Connections:

2. Reset the Unit:

    • Power down your air conditioner by following the specific steps outlined in your Mr. Cool user manual.
    • Wait for at least 10 minutes before restarting the unit.
    • Check if the error persists after rebooting.

3. Clean Air Filters:

  • Locate the air filters on your Mr. Cool air conditioner (refer to your user manual).
  • Follow these step-by-step instructions to clean or replace the air filters.

 3. Clean Air Filters:

4. Professional Assistance:

  • If the error persists despite your efforts, seek help from a qualified HVAC technician.
  • Provide them with details about the troubleshooting steps you’ve taken for a more efficient diagnosis.

After encountering the double dash error, I followed the detailed steps to inspect wiring connections. I found a loose wire and fixed the issue within minutes. The troubleshooting guide was a lifesaver!” – John from Texas.

Preventing Future Errors:

To prevent the recurrence of the double dash error adopt these preventive measures:

  1. Schedule regular maintenance: Engage a professional HVAC technician for routine maintenance to proactively identify and address potential issues.
  2. Maintain cleanliness: Ensure that the outdoor unit remains free from debris, leaves, and obstructions that could hinder its performance.
  3. Adhere to manufacturer’s guidelines: Consult the user manual provided by the manufacturer for essential information on maintenance and model-specific troubleshooting for your Mr. Cool air conditioner.


While the double dash error may cause concern, a comprehensive understanding of its implications, along with appropriate troubleshooting measures, facilitates effective issue resolution. Prioritizing regular maintenance and adhering to manufacturer guidelines are pivotal in averting future errors and ensuring optimal air conditioner performance.

Encountering a double dash error on your Mr. Cool air conditioner’s display can be perplexing, potentially indicating underlying issues that require prompt attention. Expanding on the significance of this error, it’s essential to recognize that such an error typically signifies a disruption in communication between the indoor and outdoor units of the air conditioning system. This communication breakdown can arise from various factors beyond just loose wiring connections or a malfunctioning control board. In some instances, issues with the temperature sensor could also contribute to this error, exacerbating the disruption between the system’s components. Understanding these nuances is fundamental to effectively diagnosing and resolving the double dash error, ensuring the efficient operation of your cooling system.

To delve deeper into troubleshooting the double dash error, meticulous attention to wiring connections is imperative. Beyond mere inspection, ensure that all connections are snug and intact, addressing any signs of wear, fraying, or disconnections promptly. Additionally, resetting the unit following the manufacturer’s guidelines can often rectify transient issues. However, if the error persists, consider cleaning or replacing the air filters as clogged filters can impede airflow, exacerbating communication issues between indoor and outdoor units. Moreover, seeking professional assistance from HVAC technicians equipped with the expertise to diagnose and rectify complex issues is advisable, especially if the error persists despite initial troubleshooting efforts. By diligently following these troubleshooting steps and seeking professional assistance when necessary, you can effectively address the double dash error and restore your Mr. Cool air conditioner to optimal functionality, ensuring uninterrupted comfort in your living space.

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About the author


I am Ben , a seasoned HVAC specialist with over 6 of experience in the HVAC industry. I holds HVAC Certification and has a proven track record in providing expert advice on HVAC systems.