Mitsubishi air conditioner error code e6

Air conditioners are indispensable appliances that ensure our indoor spaces remain comfortable, especially during extreme weather conditions. Among various brands, Mitsubishi stands out for its innovation, efficiency, and longevity. However, like any other machine, Mitsubishi air conditioners can sometimes encounter issues, one of which is indicated by the E6 error code.

What is the E6 Error Code?

When your Mitsubishi air conditioner displays an error code, it’s an internal distress signal pointing to a specific issue. In the case of the E6 error code, it relates to a communication error between the indoor and outdoor units. This is commonly experienced with split-system or ductless air conditioners, where the indoor air handler and the outdoor condenser exchange information via electrical wiring. Understanding this error code is crucial in formulating an effective solution.

Root Causes of the E6 Error Code

Multiple factors could lead your Mitsubishi air conditioner to flash the E6 error code. Here’s a closer look at some of the possible causes:

  1. Faulty Wiring: The wiring connecting the indoor and outdoor units is the primary conduit of communication for these appliances. If the wires are damaged, disconnected, or improperly installed, it could lead to the E6 error code.
  2. Defective PCB (Printed Circuit Board): The printed circuit board in both the indoor and outdoor units is like the brain of the system. If there’s a malfunction in either of the PCBs, communication might be disrupted, leading to the E6 error code.
  3. Malfunctioning Fan Motor: In some cases, a malfunctioning fan motor in the outdoor unit can trigger the E6 error. If the motor isn’t spinning freely or has become defective, it can disrupt normal operation and prompt the E6 error.
  4. Power Surges or Fluctuations: Power inconsistencies, such as surges or fluctuations, can also lead to communication disruption between the units, resulting in the E6 error code.

These potential causes underline the multifaceted nature of the E6 error code. Its emergence doesn’t necessarily point to a single definitive problem but rather a general communication breakdown that requires further inspection.

A Step-By-Step Guide to Troubleshooting the E6 Error Code

Before calling a professional HVAC technician, you might want to do some preliminary troubleshooting. Here are the steps you can follow:

  1. Inspect the Wiring: First, look for any visible signs of damage to the wires connecting the indoor and outdoor units. Be sure to switch off and unplug the unit before checking. If the wires are frayed, burned, or cut, they’ll need replacement.
  2. Reset the Air Conditioner: Sometimes, a simple reset can do wonders. Disconnect your Mitsubishi air conditioner from the power source, wait for a few minutes, and then plug it back in. If the E6 error code was triggered by a minor glitch, this could solve the problem.
  3. Examine the Fan Motor: Check the fan motor in the outdoor unit to see if it’s working properly and able to spin freely. If it’s not, this could be the culprit behind the E6 error code.
  4. Assess Your Power Supply: Power supply issues can cause various problems for air conditioners. You might want to check for any signs of power surges or fluctuations in your home.

When to Contact a Professional

While troubleshooting can be a cost-effective way to handle the E6 error code, there are instances when professional help is needed. If you don’t feel comfortable handling electrical wires, are unable to identify the problem, or the error code persists despite your efforts, it’s advisable to call a professional HVAC technician. These experts are equipped with the necessary tools, skills, and knowledge to diagnose and fix the issue safely and effectively.


Although encountering the E6 error code on your Mitsubishi air conditioner can be frustrating, it’s not a sign of a catastrophic failure. With a little understanding of the underlying causes and some basic troubleshooting skills, you could possibly resolve the problem. But remember, when in doubt, it’s always best to call for professional assistance. Your air conditioner is an investment that deserves proper care and maintenance, so make sure any repairs are done correctly. The E6 error code is not a death sentence for your air conditioner, but a wake-up call reminding you to pay closer attention to its health and condition.