Lennox Mini Split Error Codes and What They Might Mean

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

What any code means will ultimately depend on the specific model of your mini split system. You can review your manual for a guide for what each code means. You can also trust the HVAC pros at Abilene Air-Tech Inc. Our technicians are trained to learn these codes in order to deliver prompt mini split repair in Abilene. Give us a call at (325) 692-5850 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 see. To learn what your error code can mean, consider the following:

Is your model a mini split air conditioner or a mini split heat pump?
Are there clear signs of what malfunctioned? A loud noise coming from a key component, for example.

Here are a few 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 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 not be able to properly balance indoor temperatures.

E5 – Voltage Protection or Temperature Sensor Error

If you own a mini split heat pump, an E5 error could refer to a problem with the system’s voltage. A repair technician from Abilene Air-Tech Inc may refer to it as overcurrent protection. Both excessively high or low voltage can produce this error code.

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

P4 – Compressor Drive Error / High Temperature

A P4 error code will most times be related to your mini splits compressor system, found 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 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 damaged, a P6 error code is common.

When temperatures exceed safe levels, a safety switch should 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 struggling with high or low pressure issues.

Check 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 have a guide for these error codes and what they can mean. But since many of these codes refer to electrical problems, professional experience is often required.

Call Abilene Air-Tech Inc for Mini Split Repair

Abilene Air-Tech Inc 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 identify your specific 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 Abilene, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at (325) 692-5850 today.