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 piece of HVAC equipment is flawless. There’s always a possibility your mini split could malfunction. To find out what is malfunctioning, you’ll want to locate where the mini split error codes are displayed. Recognizing what these codes mean can help you kickstart mini split repair, especially if professional help is necessary.

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 contact the HVAC pros at Oak Grove Heating & Air Conditioning. Our technicians are trained to learn these codes in order to deliver prompt mini split repair in Hattiesburg. Give us a call at 601-292-9763 to request an appointment.

Common Lennox Mini Split Error Codes

While error codes can differ from model to model, there are some codes you’ll be more likely to see. 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 key 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 struggling with 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 may indicate a problem with the system’s voltage. A repair technician from Oak Grove Heating & Air Conditioning may refer to it as overcurrent protection. Both unusually high or low voltage can result in this error code.

For mini split air conditioners, this code may 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 might 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, located 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 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 malfunctioning, 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 may appear. You may also find the P6 code if the compressor is experiencing high or low pressure concerns.

Consult the Manual for Your Specific Model

Keep in mind that in general, error codes are specific to each model of a Lennox mini split system. Your manual will provide a guide for these error codes and what they can mean. But as many of these codes refer to electrical problems, professional experience is usually needed.

Call Oak Grove Heating & Air Conditioning for Mini Split Repair

Oak Grove Heating & Air Conditioning 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 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 Hattiesburg, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 601-292-9763 today.