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 offer both heating and cooling.

But no home comfort system is flawless. There’s always a risk your mini split will malfunction. To determine what went wrong, you’ll want to locate where the mini split error codes are displayed. Understanding what these codes refer to can help you kickstart mini split repair, especially if professional help is required.

What the error code means will ultimately depend on the specific model of your mini split system. You can check your manual for a guide for what each code means. You can also call the HVAC pros at Connolly Electric & Mechanical. Our technicians are trained to learn these codes in order to deliver prompt mini split repair in Cottonwood. Give us a call at 928-639-4251 to request an appointment.

Common Lennox Mini Split Error Codes

While error codes may differ from model to model, there are some codes you’ll be more likely to come across. 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 is happening? A strange noise coming from an important 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 disrupted. It could be facing intermittent connection problems or have failed entirely. When the indoor and outdoor units can’t communicate with one another, it will be unable to effectively balance indoor temperatures.

E5 – Voltage Protection or Temperature Sensor Error

If you own a mini split heat pump, an E5 error could stand for a problem with the system’s voltage. A repair technician from Connolly Electric & Mechanical 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 could 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, like 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 most times be concerned with your mini splits compressor system, housed within the outdoor unit. When the compressor drive is faulty, the most likely cause is excessively high temperatures. A high temperature at the discharge line could 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 rise above 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 may appear. You may also find the P6 code if the compressor is struggling with 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 can mean. But as many of these codes stem from electrical problems, professional experience is usually necessary.

Call Connolly Electric & Mechanical for Mini Split Repair

Connolly Electric & Mechanical 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 identify your unique 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 Cottonwood, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 928-639-4251 today.