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 provide both heating and cooling.

But no ductless mini-split 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. Understanding what these codes mean can help you kick-start mini-split repair, especially if professional help is needed.

What the error code means will ultimately depend on the specific model of your mini-split system. You can check your manual to find a guide for what each code means. You can also call the HVAC pros at Custom Air Systems Inc. Our technicians are trained to recognize these codes in order to deliver prompt mini-split repair in Port St. Lucie. Give us a call at 772-247-2283 to schedule 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 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 clear 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 means that communication between the mini-split system’s indoor and outdoor units has been impeded. It might be facing intermittent connection issues 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 Custom Air Systems Inc may refer to it as overcurrent protection. Both very 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, 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 connected to your mini-splits compressor system, found within the outdoor unit. When the compressor drive is malfunctioning, 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 faulty, 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 may appear. You may also find the P6 code if the compressor is experiencing high or low pressure issues.

Check the Manual for Your Specific Model

Don’t forget 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 because many of these codes refer to electrical problems, professional experience is often necessary.

Call Custom Air Systems Inc for Mini-Split Repair

Custom Air Systems 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 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 Port St. Lucie, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 772-247-2283 today.