Lennox mini-split systems are a great 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 home comfort system is flawless. There’s always a risk your mini-split will malfunction. To determine what is malfunctioning, you’ll want to locate where the mini-split error codes are displayed. Understanding what these codes refer to can help you kick-start mini-split repair, especially if professional help is necessary.

What the error 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 Knoechel Heating. Our technicians are trained to recognize these codes in order to deliver prompt mini-split repair in Zelienople. Give us a call at 724-425-5852 to schedule 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 might mean, consider the following:

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

Are there additional signs of what is happening? 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 hampered. It might be experiencing intermittent connection problems 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 could refer to a problem with the system’s voltage. A repair technician from Knoechel Heating may refer to it as overcurrent protection. Both very high or low voltage can create this error code.

For mini-split air conditioners, this code can also stand for 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 related to your mini-splits compressor system, housed 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 can also lead to 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 facing high or low pressure issues.

Check 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 provide a guide for these error codes and what they should mean. But because many of these codes stem from electrical problems, professional experience is often necessary.

Call Knoechel Heating for Mini-Split Repair

Knoechel Heating 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 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 Zelienople, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 724-425-5852 today.