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 risk your mini-split could malfunction. To identify what happened, you should locate where the mini-split error codes are displayed. Recognizing what these codes mean can help you kick-start 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 review your manual to find a guide for what each code means. You can also call the HVAC pros at Booneville Heating & Cooling. Our technicians are trained to learn these codes in order to provide prompt mini-split repair in Booneville. Give us a call at 662-269-8716 to book 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 learn what your error code can mean, ask yourself the following:

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

Are there clear signs of what is happening? A loud noise coming from a specific 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 disrupted. It may be struggling with intermittent connection issues or have failed entirely. When the indoor and outdoor units can’t communicate with one another, it will be unable to properly 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 Booneville Heating & Cooling may refer to it as overcurrent protection. Both unusually high or low voltage can produce this error code.

For mini-split air conditioners, this code could 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, like an E1 code. It could also be an issue with one of the temperature sensors.

P4 – Compressor Drive Error / High Temperature

A P4 error code will most times be connected to your mini-splits compressor system, found within the outdoor unit. When the compressor drive is malfunctioning, the most likely cause 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 faulty, 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 manage the outdoor compressor. If this switch is open, the P6 code can appear. You may also find the P6 code if the compressor is facing high or low pressure concerns.

Consult Your Manual for the Exact Model

Keep in mind 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 stem from electrical problems, professional experience is usually required.

Contact Booneville Heating & Cooling for Mini-Split Repair

Booneville Heating & Cooling 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 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 Booneville, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 662-269-8716 today.