Lennox Mini Split Error Codes and What They Could Mean

October 25, 2021

Lennox mini split systems are a solid way to provide compact, yet effective 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 could malfunction. To determine what is malfunctioning, you’ll want to locate where the mini split error codes are displayed. Knowing what these codes refer to can help ensure fast mini split repair, especially if professional help is necessary.

What the error 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 Quality Solutions. Our technicians are trained to learn these codes in order to ensure prompt mini split repair in Grove City. Give us a call at 614-871-4144 to book 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 see. To identify what your error code may mean, consider the following:

  • Is your system 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 a handful of the more common error codes for Lennox mini splits.

E1 – Indoor / Outdoor Unit Communication

In general, an E1 error code signifies that communication between the mini split system’s indoor and outdoor units has been hampered. 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 can stand for a problem with the system’s voltage. A repair technician from Air Quality Solutions may refer to it as overcurrent protection. Both excessively high or low voltage can create this error code.

For mini split air conditioners, this code can 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 could also be a problem with one of the temperature sensors.

P4 – Compressor Drive Error / High Temperature

A P4 error code will usually be concerned with your mini splits compressor system, located 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 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 malfunctioning, a P6 error code is common.

When temperatures rise above 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 struggling with high or low pressure concerns.

Review the Manual for Your Specific Model

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

Call Air Quality Solutions for Mini Split Repair

Air Quality Solutions 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 Grove City, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 614-871-4144 today.