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 could malfunction. To determine what went wrong, you should locate where the mini split error codes are displayed. Knowing what these codes mean can help ensure fast mini split repair, especially if professional help is necessary.

What each 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 Redhawk Heating & Air Conditioning. Our technicians are trained to recognize these codes in order to deliver prompt mini split repair in Odessa. Give us a call at 432-237-0168 to request an appointment.

Common Lennox Mini Split Error Codes

While error codes may 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, 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 loud noise coming from a specific 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 may be facing 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 adequately balance indoor temperatures.

E5 – Voltage Protection or Temperature Sensor Error

If you own a mini split heat pump, an E5 error can stand for a problem with the system’s voltage. A repair technician from Redhawk Heating & Air Conditioning 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 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 might 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, found within the outdoor unit. When the compressor drive is malfunctioning, 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 malfunctioning, 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 experiencing high or low pressure issues.

Check the 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 have a guide for these error codes and what they should mean. But since many of these codes start with electrical problems, professional experience is usually needed.

Call Redhawk Heating & Air Conditioning for Mini Split Repair

Redhawk Heating & Air Conditioning 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 diagnose 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 Odessa, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 432-237-0168 today.