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 piece of HVAC equipment is flawless. There’s always a risk your mini-split can malfunction. To find out what happened, 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 required.

What any code means will ultimately depend on the specific model of your mini-split system. You can consult your manual for a guide for what each code means. You can also call the HVAC pros at North Mechanical Heating and Cooling. Our technicians are trained to learn these codes in order to deliver prompt mini-split repair in Payson. Give us a call at 928-263-8570 to book 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 see. To learn what your error code might mean, ask yourself the following:

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

Are there additional signs of what is happening? A strange noise coming from a key component, for example.

Here are a handful 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 might 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 effectively balance indoor temperatures.

E5 – Voltage Protection or Temperature Sensor Error

If you own a mini-split heat pump, an E5 error may refer to a problem with the system’s voltage. A repair technician from North Mechanical Heating and Cooling 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 could 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, 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 usually be related to your mini-splits compressor system, housed within the outdoor unit. When the compressor drive is faulty, the most likely culprit is excessively high temperatures. A high temperature at the discharge line may 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 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 issues.

Consult Your Service Manual for Your Specific Model

Remember 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 should mean. But as many of these codes start with electrical problems, professional experience is often necessary.

Call North Mechanical Heating and Cooling for Mini-Split Repair

North Mechanical 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 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 Payson, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 928-263-8570 today.