Lennox Mini Split Error Codes and What They Might Mean

October 25, 2021

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 offer both heating and cooling.

But no ductless mini split is flawless. There’s always a risk your mini split will malfunction. To find out what is malfunctioning, you’ll want to locate where the mini split error codes are displayed. Recognizing what these codes mean can help ensure fast 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 to find a guide for what each code means. You can also call the HVAC pros at Street Heating and Cooling. Our technicians are trained to learn these codes in order to ensure prompt mini split repair in Rapid City. Give us a call at 605-206-3915 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 may 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 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 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 properly 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 Street Heating and Cooling may refer to it as overcurrent protection. Both excessively high or low voltage can produce 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 may also be a problem with one of the temperature sensors.

P4 – Compressor Drive Error / High Temperature

A P4 error code will most times be concerned with your mini splits compressor system, located within the outdoor unit. When the compressor drive is faulty, the most likely cause 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 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 rise above 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 concerns.

Check the Manual for Your Specific Model

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

Call Street Heating and Cooling for Mini Split Repair

Street Heating and Cooling can deliver 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 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 Rapid City, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 605-206-3915 today.