Lennox Mini Split Error Codes and What They Might Mean

October 25, 2021

Lennox mini split systems are a solid way to provide compact, yet powerful temperature control for your home. Some models are built for air conditioning only, while heat pump models can provide 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’ll want to locate where the mini split error codes are displayed. Recognizing what these codes mean can help you kickstart mini split repair, especially if professional help is needed.

What the error code means will ultimately depend on the specific model of your mini split system. You can review your manual for a guide for what each code means. You can also trust the HVAC pros at Air Houston Mechanical LLC. Our technicians are trained to learn these codes in order to provide prompt mini split repair in Huffman. Give us a call at 832-777-1521 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 see. To determine what your error code can mean, ask yourself the following:

  • Is your system a mini split air conditioner or a mini split heat pump?
  • Are there clear 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 means that communication between the mini split system’s indoor and outdoor units has been impeded. It could be experiencing 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 could indicate a problem with the system’s voltage. A repair technician from Air Houston Mechanical LLC may refer to it as overcurrent protection. Both very high or low voltage can result in this error code.

For mini split air conditioners, this code can also represent 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 generally be related to your mini splits compressor system, housed within the outdoor unit. When the compressor drive is malfunctioning, the most likely reason 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 experiencing high or low pressure concerns.

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 have a guide for these error codes and what they can mean. But because many of these codes stem from electrical problems, professional experience is often required.

Call Air Houston Mechanical LLC for Mini Split Repair

Air Houston Mechanical LLC 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 unique 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 Huffman, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 832-777-1521 today.