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 piece of HVAC equipment is flawless. There’s always a possibility your mini-split can malfunction. To identify what is malfunctioning, you’ll want to locate where the mini-split error codes are displayed. Recognizing what these codes refer to 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 review your manual to find a guide for what each code means. You can also contact the HVAC pros at Lakeside Heating & Air. Our technicians are trained to recognize these codes in order to provide prompt mini-split repair in Chelan and Wenatchee. Give us a call at 509-284-4265 to request an appointment.

What Error Codes for Lennox Mini Splits Are Most Common?

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

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

Are there additional signs of what malfunctioned? A loud 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 indicates that communication between the mini-split system’s indoor and outdoor units has been hampered. It might be experiencing intermittent connection issues 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 could indicate a problem with the system’s voltage. A repair technician from Lakeside Heating & Air may refer to it as overcurrent protection. Both excessively high or low voltage can create this error code.

For mini-split air conditioners, this code may 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 may also be an issue 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 not working, the most likely reason is excessively high temperatures. A high temperature at the discharge line could also lead to 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 damaged, 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 can appear. You may also find the P6 code if the compressor is struggling with high or low pressure concerns.

Review Your Manual for the Exact Model

Remember that in general, error codes are different for each model of a Lennox mini-split system. Your manual will have a guide for these error codes and what they should mean. But since many of these codes refer to electrical problems, professional experience is usually necessary.

Contact Lakeside Heating & Air for Mini-Split Repair

Lakeside Heating & Air 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 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 Chelan and Wenatchee, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 509-284-4265 today.