How to Check Friedrich Inverter Error Code: A Comprehensive Guide

Troubleshooting your Friedrich air conditioner’s inverter error codes can be a daunting task, but with the right information and approach, you can quickly identify and resolve the issue. This comprehensive guide will walk you through the step-by-step process of checking and interpreting Friedrich inverter error codes, equipping you with the knowledge and tools necessary to maintain your air conditioning system effectively.

Understand the Friedrich Inverter Error Code System

Friedrich air conditioners utilize an advanced inverter technology that provides efficient and precise temperature control. However, like any complex system, the inverter can occasionally encounter issues that trigger error codes. These codes are designed to help you and your HVAC technician quickly identify the root cause of the problem.

Friedrich’s inverter error codes are typically alphanumeric, consisting of a combination of letters and numbers. Each code represents a specific issue, ranging from sensor malfunctions to compressor failures. By understanding the meaning behind these codes, you can take the appropriate actions to resolve the problem.

Locate the Error Code Display

how to check Friedrich inverter error code

The first step in checking the Friedrich inverter error code is to locate the display where the code is shown. Depending on your specific model, the error code may be displayed on the indoor unit’s control panel, the remote control, or both. Consult your Friedrich air conditioner’s user manual to determine the exact location of the error code display.

Interpret the Error Code

Once you have identified the error code, you can refer to the Friedrich service manual or the manufacturer’s website to decipher its meaning. These resources will provide a comprehensive list of all the possible error codes, along with a detailed description of the issue and the recommended troubleshooting steps.

Here’s an example of how to interpret a common Friedrich inverter error code:

Error Code Description Possible Cause
E5 Compressor Overload Protection – Compressor overload due to high pressure or locked rotor
– Compressor winding issue
– Refrigerant overcharge or undercharge

By understanding the meaning of the error code, you can then proceed to the next step of troubleshooting and resolving the issue.

Inspect the Wiring and Connections

If the error code indicates a problem with the power supply or wiring, you should carefully inspect the internal wiring of the air conditioner. Ensure that all connections are secure and there are no visible signs of damage or corrosion.

When inspecting the wiring, pay close attention to the following:

  1. Power Supply Connections: Check the integrity of the power supply connections, including the main power cord, circuit breaker, and any other electrical components.
  2. Sensor Connections: Verify that the connections for the various sensors (temperature, pressure, etc.) are properly secured and free from damage.
  3. Compressor Connections: Inspect the connections to the compressor, ensuring that they are tight and free from any issues.

If you identify any loose or damaged connections, carefully tighten them or replace the affected components as necessary.

Utilize the Built-in Troubleshooting Tool

Some Friedrich air conditioners are equipped with a built-in troubleshooting tool that can help you diagnose and resolve common issues. This tool may be accessible through the control panel or the remote control, and it can provide step-by-step guidance on how to interpret the error code and perform basic troubleshooting.

Refer to your user manual or the Friedrich website to learn how to access and use the built-in troubleshooting tool for your specific model. This feature can be a valuable resource in identifying and addressing the problem without the need for advanced technical knowledge.

Consult a Licensed HVAC Technician

If you are unable to resolve the issue after following the steps outlined above, it is recommended that you contact a licensed HVAC technician. These professionals have the expertise, tools, and experience necessary to diagnose and repair more complex issues with your Friedrich air conditioner’s inverter system.

HVAC technicians can perform advanced diagnostics, access service mode, and utilize specialized equipment to identify and address the root cause of the error code. They can also provide guidance on proper maintenance and preventive measures to help avoid future issues.

By working with a licensed HVAC technician, you can ensure that your Friedrich air conditioner is repaired correctly and continues to operate at peak efficiency.


Checking and interpreting Friedrich inverter error codes is a crucial step in maintaining the optimal performance of your air conditioning system. By following the comprehensive guide outlined in this article, you can confidently identify and resolve common issues, saving time and money on costly repairs.

Remember to always refer to your Friedrich air conditioner’s user manual and service resources, as they contain the most up-to-date and model-specific information. Additionally, don’t hesitate to consult a licensed HVAC technician if you encounter any complex or persistent problems with your Friedrich inverter system.

With the right knowledge and approach, you can keep your Friedrich air conditioner running smoothly and efficiently for years to come.


  1. Friedrich Service Manual
  2. YouTube video on Friedrich troubleshooting tool
  3. Friedrich Air Conditioner Error Codes – Luce Aircon