Lennox Mini Split Error Codes and What They Might Mean

October 25, 2021

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

But no home comfort system is flawless. There’s always a possibility your mini split can malfunction. To determine what is malfunctioning, 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 needed.

What the error code means will ultimately rely on the specific model of your mini split system. You can consult your manual for a guide for what each code means. You can also call the HVAC pros at Vogts Heating & Air. Our technicians are trained to learn these codes in order to provide prompt mini split repair in Pocatello. Give us a call at 208-621-0129 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 see. To identify what your error code could mean, consider 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 means that communication between the mini split system’s indoor and outdoor units has been hampered. It might be facing intermittent connection issues or have failed entirely. When the indoor and outdoor units can’t communicate with one another, it will be unable to properly balance indoor temperatures.

E5 – Voltage Protection or Temperature Sensor Error

If you own a mini split heat pump, an E5 error may indicate a problem with the system’s voltage. A repair technician from Vogts Heating & Air 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 could also stand for 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 may also be a problem 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, housed within the outdoor unit. When the compressor drive is malfunctioning, the most likely culprit is excessively high temperatures. A high temperature at the discharge line could also trigger a P4 code.

P6 – Compressor Switch Open or Drive Board Failure

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

When temperatures exceed 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 could appear. You may also find the P6 code if the compressor is facing high or low pressure issues.

Review the Manual for Your Specific Model

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

Call Vogts Heating & Air for Mini Split Repair

Vogts Heating & Air 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 Pocatello, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 208-621-0129 today.