Lennox Mini Split Error Codes and What They Might Mean

October 25, 2021

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 offer both heating and cooling.

But no home comfort system is flawless. There’s always a risk your mini split will malfunction. To find out what happened, you should locate where the mini split error codes are displayed. Knowing what these codes mean can help you kickstart 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 check your manual for a guide for what each code means. You can also call the HVAC pros at Colvin's Heating and Cooling. Our technicians are trained to recognize these codes in order to deliver prompt mini split repair in Excelsior Springs. Give us a call at 816-379-3918 to request an appointment.

Common Lennox Mini Split Error Codes

While error codes will differ from model to model, there are some codes you’ll be more likely to come across. To learn what your error code might mean, ask yourself 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 a key 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 disrupted. It might 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 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 Colvin's Heating and Cooling may refer to it as overcurrent protection. Both unusually high or low voltage can create this error code.

For mini split air conditioners, this code could also stand for 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, like an E1 code. It could 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 culprit 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 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 experiencing high or low pressure issues.

Check the Manual for Your Specific Model

Remember 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 should mean. But because many of these codes refer to electrical problems, professional experience is typically necessary.

Call Colvin's Heating and Cooling for Mini Split Repair

Colvin's Heating and Cooling 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 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 Excelsior Springs, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 816-379-3918 today.