Lennox mini-split systems are a solid way to provide compact, yet effective 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 risk your mini-split will malfunction. To identify what went wrong, you’ll want to locate where the mini-split error codes are displayed. Knowing what these codes mean can help ensure fast mini-split repair, especially if professional help is needed.

What any 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 contact the HVAC pros at Thurston Heating & Air Conditioning. Our technicians are trained to recognize these codes in order to deliver prompt mini-split repair in Kearney. Give us a call at 308-624-3485 to schedule an appointment.

Common Error Codes for Lennox Mini Splits

While error codes may 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 model a mini-split air conditioner or a mini-split heat pump?

Are there other signs of what malfunctioned? A loud noise coming from an important 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 impeded. It may be struggling with 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 adequately 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 Thurston Heating & Air Conditioning 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 may also indicate 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, 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 generally be connected to your mini-splits compressor system, found within the outdoor unit. When the compressor drive is faulty, the most likely reason is excessively high temperatures. A high temperature at the discharge line may 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 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 can appear. You may also find the P6 code if the compressor is struggling with high or low pressure issues.

Check the Manual for Specifics

Don’t forget that in general, error codes are specific to each model of a Lennox mini-split system. Your manual will offer a guide for these error codes and what they can mean. But since many of these codes refer to electrical problems, professional experience is typically necessary.

Trust Thurston Heating & Air Conditioning for Mini-Split Repair

Thurston Heating & Air Conditioning 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 specific 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 Kearney, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 308-624-3485 today.