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 piece of HVAC equipment is flawless. There’s always a possibility your mini-split can malfunction. To identify what happened, you should locate where the mini-split error codes are displayed. Knowing what these codes mean can help you kick-start mini-split repair, especially if professional help is required.

What any code means will ultimately rely 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 Kilbourne Heating & AC. Our technicians are trained to learn these codes in order to deliver prompt mini-split repair in Delray Beach. Give us a call at 561-287-7071 to schedule an appointment.

What Error Codes for Lennox Mini Splits Are Most Common?

While error codes can differ from model to model, there are some codes you’ll be more likely to come across. To determine what your error code might mean, consider the following:

Is your model a mini-split air conditioner or a mini-split heat pump?

Are there other signs of what is happening? A strange noise coming from a key 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 signifies that communication between the mini-split system’s indoor and outdoor units has been hampered. It might 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 stand for a problem with the system’s voltage. A repair technician from Kilbourne Heating & AC 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 may also represent 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 may also be an issue 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 faulty, 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 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 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 could appear. You may also find the P6 code if the compressor is experiencing high or low pressure concerns.

Consult the Manual for the Exact Model

Don’t forget 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 can mean. But as many of these codes refer to electrical problems, professional experience is often needed.

Trust Kilbourne Heating & AC for Mini-Split Repair

Kilbourne Heating & AC 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 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 Delray Beach, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 561-287-7071 today.