Lennox Mini Split Error Codes and What They Might Mean

October 25, 2021

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

But no ductless mini split is flawless. There’s always a possibility your mini split could malfunction. To find out what went wrong, you should locate where the mini split error codes are displayed. Knowing what these codes mean can help ensure fast mini split repair, especially if professional help is required.

What any code means will ultimately rely on the specific model of your mini split system. You can review your manual to find a guide for what each code means. You can also trust the HVAC pros at Air Concepts of Middle Georgia. Our technicians are trained to learn these codes in order to ensure prompt mini split repair in Middle Georgia. Give us a call at 478-200-5689 to request 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 come across. 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 other signs of what malfunctioned? A loud noise coming from a specific component, for example.

Here are a handful 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 hampered. It could be experiencing 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 could refer to a problem with the system’s voltage. A repair technician from Air Concepts of Middle Georgia may refer to it as overcurrent protection. Both excessively high or low voltage can result in this error code.

For mini split air conditioners, this code may also indicate 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, like an E1 code. It may also be an issue with one of the temperature sensors.

P4 – Compressor Drive Error / High Temperature

A P4 error code will usually be related to your mini splits compressor system, found within the outdoor unit. When the compressor drive is not working, the most likely culprit is excessively high temperatures. A high temperature at the discharge line can also result in 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 damaged, a P6 error code is common.

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

Check the Manual for Your Specific Model

Don’t forget that in general, error codes are specific to each model of a Lennox mini split system. Your manual will offer a guide for these error codes and what they can mean. But because many of these codes start with electrical problems, professional experience is often necessary.

Call Air Concepts of Middle Georgia for Mini Split Repair

Air Concepts of Middle Georgia can offer 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 may 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 Middle Georgia, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 478-200-5689 today.