Lennox Mini Split Error Codes and What They Could Mean

October 25, 2021

Lennox mini split systems are an excellent way to provide compact, yet effective temperature control for your home. Some models are built for air conditioning only, while heat pump models can provide both heating and cooling.

But no piece of HVAC equipment is flawless. There’s always a risk your mini split can malfunction. To identify what happened, you should locate where the mini split error codes are displayed. Understanding what these codes refer to can help ensure fast mini split repair, especially if professional help is required.

What each code means will ultimately rely on the specific model of your mini split system. You can check your manual to find a guide for what each code means. You can also contact the HVAC pros at Cytech Heating & Cooling L.C.. Our technicians are trained to recognize these codes in order to ensure prompt mini split repair in the Rio Grande Valley. Give us a call at 956-630-3522 to schedule an appointment.

Common Lennox Mini Split Error Codes

While error codes will differ from model to model, there are some codes you’ll be more likely to encounter. To identify what your error code may mean, ask yourself the following:

  • Is your model a mini split air conditioner or a mini split heat pump?
  • Are there additional signs of what malfunctioned? A loud noise coming from a specific component, for example.

Here are some of the more common error codes for Lennox mini splits.

E1 – Indoor / Outdoor Unit Communication

In general, an E1 error code indicates that communication between the mini split system’s indoor and outdoor units has been impeded. It might be struggling with intermittent connection problems or have failed entirely. When the indoor and outdoor units can’t communicate with one another, it will not be able to effectively balance indoor temperatures.

E5 – Voltage Protection or Temperature Sensor Error

If you own a mini split heat pump, an E5 error can refer to a problem with the system’s voltage. A repair technician from Cytech Heating & Cooling L.C. may refer to it as overcurrent protection. Both very high or low voltage can produce this error code.

For mini split air conditioners, this code may also represent voltage issues. In other cases, it’s pointing you to a circuit problem with the outdoor temperature sensor.

E6 – Indoor / Outdoor Unit Communication

An E6 error code can also refer to a communication problem between the two units, similar to an E1 code. It might also be an issue with one of the temperature sensors.

P4 – Compressor Drive Error / High Temperature

A P4 error code will most times be concerned with your mini splits compressor system, housed within the outdoor unit. When the compressor drive is not working, the most likely reason is excessively high temperatures. A high temperature at the discharge line can also lead to a P4 code.

P6 – Compressor Switch Open or Drive Board Failure

Your mini split system will have computer boards that make sure the indoor and outdoor units can communicate with one another. If the drive board is faulty, a P6 error code is common.

When temperatures rise above safe levels, a safety switch will protect the electrical components of your mini split system, including any components that control the outdoor compressor. If this switch is open, the P6 code may appear. You may also find the P6 code if the compressor is experiencing high or low pressure issues.

Review the Manual for Your Specific Model

Remember that in general, error codes are different for each model of a Lennox mini split system. Your manual will have a guide for these error codes and what they should mean. But since many of these codes start with electrical problems, professional experience is typically required.

Call Cytech Heating & Cooling L.C. for Mini Split Repair

Cytech Heating & Cooling L.C. can provide fast and affordable ductless mini split repair. Whether you own a mini split AC system or a mini split heat pump, our technicians can quickly diagnose your specific problem.

For some problems, repairs might not be worth it. But that doesn’t mean the mini split replacement process has to be stressful. We can provide equally effective mini split installation in the Rio Grande Valley, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 956-630-3522 today.