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 provide both heating and cooling.

But no piece of HVAC equipment is flawless. There’s always a risk your mini-split can malfunction. To identify what went wrong, you’ll want to 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 the error code means will ultimately rely 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 contact the HVAC pros at Stephen Hurst Pack Heating and Cooling. Our technicians are trained to learn these codes in order to provide prompt mini-split repair in Circleville. Give us a call at 740-474-5940 to request an appointment.

Common Lennox Mini-Split Error Codes

While error codes will differ from model to model, there are some codes you’ll be more likely to see. To identify what your error code could 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 few 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 could refer to a problem with the system’s voltage. A repair technician from Stephen Hurst Pack Heating and Cooling 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 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 may 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, located 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 can 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 will 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 Service 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 usually necessary.

Call Stephen Hurst Pack Heating and Cooling for Mini-Split Repair

Stephen Hurst Pack Heating and 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 identify your unique 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 Circleville, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 740-474-5940 today.