Lennox Mini Split Error Codes and What They Could Mean

October 25, 2021

Lennox mini split systems are a great way to provide compact, yet powerful 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 refer to can help you kickstart mini split repair, especially if professional help is needed.

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 trust the HVAC pros at Ocean Air Conditioning and Heating . Our technicians are trained to recognize these codes in order to ensure prompt mini split repair in Laguna Niguel. Give us a call at 949-525-9119 to book 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 might mean, consider 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 an important 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 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 properly 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 Ocean Air Conditioning and Heating may refer to it as overcurrent protection. Both excessively high or low voltage can create this error code.

For mini split air conditioners, this code may 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, 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 concerned with your mini splits compressor system, housed 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 could also lead to 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.

Consult 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 as many of these codes stem from electrical problems, professional experience is typically needed.

Call Ocean Air Conditioning and Heating for Mini Split Repair

Ocean Air Conditioning and Heating 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 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 Laguna Niguel, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 949-525-9119 today.