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 ductless mini-split is flawless. There’s always a chance your mini-split could malfunction. To identify what went wrong, you’ll want to 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 each 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 call the HVAC pros at Farnell Mechanical, Inc.. Our technicians are trained to recognize these codes in order to ensure prompt mini-split repair in Auburn and Opelika. Give us a call at 334-524-2458 to schedule an appointment.

Common Error Codes for Lennox Mini Splits

While error codes may differ from model to model, there are some codes you’ll be more likely to come across. To learn what your error code could mean, ask yourself the following:

Is your model a mini-split air conditioner or a mini-split heat pump?

Are there other 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 means that communication between the mini-split system’s indoor and outdoor units has been impeded. It may be struggling with intermittent connection issues 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 could refer to a problem with the system’s voltage. A repair technician from Farnell Mechanical, Inc. may refer to it as overcurrent protection. Both excessively high or low voltage can result in this error code.

For mini-split air conditioners, this code could also indicate 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 might also be an issue with one of the temperature sensors.

P4 – Compressor Drive Error / High Temperature

A P4 error code will most times be connected to 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 trigger 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 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 struggling with high or low pressure issues.

Review the Service Manual for the Exact 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 as many of these codes start with electrical problems, professional experience is typically necessary.

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 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 Auburn and Opelika, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 334-524-2458 today.