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 could malfunction. To identify what went wrong, you should locate where the mini-split error codes are displayed. Knowing what these codes refer to can help you kick-start mini-split repair, especially if professional help is necessary.

What each code means will ultimately rely 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 Better Air. Our technicians are trained to recognize these codes in order to ensure prompt mini-split repair in Dundas and Northfield. Give us a call at 507-663-1208 to schedule 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 determine 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 clear signs of what malfunctioned? A loud noise coming from an important 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 disrupted. It might be facing intermittent connection issues 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 can refer to a problem with the system’s voltage. A repair technician from Better Air may refer to it as overcurrent protection. Both unusually high or low voltage can result in this error code.

For mini-split air conditioners, this code could 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 generally 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 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 faulty, a P6 error code is common.

When temperatures rise above 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 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

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

Call Better Air for Mini-Split Repair

Better Air 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 Dundas and Northfield, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 507-663-1208 today.