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 effective 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 identify what went wrong, you should locate where the mini split error codes are displayed. Recognizing what these codes mean can help ensure fast mini split repair, especially if professional help is needed.

What each code means will ultimately depend on the specific model of your mini split system. You can consult your manual to find a guide for what each code means. You can also trust the HVAC pros at Gee & Missler Heating & Air Conditioning. Our technicians are trained to learn these codes in order to ensure prompt mini split repair in Wyandotte. Give us a call at 734-363-8907 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 see. To determine what your error code may mean, ask yourself the following:

  • Is your system a mini split air conditioner or a mini split heat pump?
  • Are there other signs of what is happening? A loud noise coming from an important 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 impeded. It might be struggling with intermittent connection issues or have failed entirely. When the indoor and outdoor units can’t communicate with one another, it will be unable to adequately 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 Gee & Missler Heating & Air Conditioning may refer to it as overcurrent protection. Both unusually high or low voltage can create this error code.

For mini split air conditioners, this code could also stand for voltage issues. In other cases, it’s alerting 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 generally be related to 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 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 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 manage the outdoor compressor. If this switch is open, the P6 code can 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

Don’t forget 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 because many of these codes stem from electrical problems, professional experience is usually required.

Call Gee & Missler Heating & Air Conditioning for Mini Split Repair

Gee & Missler Heating & Air Conditioning 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 unique 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 Wyandotte, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 734-363-8907 today.