Lennox Mini Split Error Codes and What They Could Mean

October 25, 2021

Lennox mini split systems are a solid 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 chance your mini split will malfunction. To identify what happened, you should locate where the mini split error codes are displayed. Understanding what these codes mean can help ensure fast mini split repair, especially if professional help is required.

What any code means will ultimately rely 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 Farnell Mechanical, Inc.. Our technicians are trained to recognize these codes in order to provide prompt mini split repair in Opelika. Give us a call at 334-245-4748 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 encounter. To learn what your error code can mean, ask yourself the following:

  • Is your model a mini split air conditioner or a mini split heat pump?
  • Are there clear 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 indicates that communication between the mini split system’s indoor and outdoor units has been impeded. 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 be unable to adequately balance indoor temperatures.

E5 – Voltage Protection or Temperature Sensor Error

If you own a mini split heat pump, an E5 error may indicate a problem with the system’s voltage. A repair technician from Farnell Mechanical, Inc. 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 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, similar to an E1 code. It could also be an issue 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 malfunctioning, the most likely cause is excessively high temperatures. A high temperature at the discharge line could also result in 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 faulty, a P6 error code is common.

When temperatures exceed safe levels, a safety switch will protect the electrical components of your mini split system, including any components that manage the outdoor compressor. If this switch is open, the P6 code may appear. You may also find the P6 code if the compressor is experiencing high or low pressure issues.

Consult the Manual for Your Specific Model

Keep in mind that in general, error codes are different for each model of a Lennox mini split system. Your manual will provide a guide for these error codes and what they should mean. But since many of these codes stem from electrical problems, professional experience is usually required.

Call Farnell Mechanical, Inc. for Mini Split Repair

Farnell Mechanical, Inc. 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 identify 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 Opelika, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 334-245-4748 today.