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 deliver both heating and cooling.

But no home comfort system is flawless. There’s always a risk your mini-split will malfunction. To determine what happened, you’ll want to locate where the mini-split error codes are displayed. Knowing what these codes refer to can help ensure fast mini-split repair, especially if professional help is needed.

What any code means will ultimately rely on the specific model of your mini-split system. You can review your manual to find a guide for what each code means. You can also contact the HVAC pros at Pepper AC & Heat. Our technicians are trained to learn these codes in order to provide prompt mini-split repair in Justin. Give us a call at 940-202-1184 to request 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 come across. To identify 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 strange 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 means that communication between the mini-split system’s indoor and outdoor units has been impeded. It could be experiencing intermittent connection issues 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 stand for a problem with the system’s voltage. A repair technician from Pepper AC & Heat 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 may 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 might also be a problem with one of the temperature sensors.

P4 – Compressor Drive Error / High Temperature

A P4 error code will most times be related to your mini-splits compressor system, located within the outdoor unit. When the compressor drive is faulty, the most likely culprit is excessively high temperatures. A high temperature at the discharge line can 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 faulty, 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 may appear. You may also find the P6 code if the compressor is struggling with high or low pressure concerns.

Review Your Service Manual for Specifics

Keep in mind 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 can mean. But as many of these codes start with electrical problems, professional experience is often needed.

Contact Pepper AC & Heat for Mini-Split Repair

Pepper AC & Heat can deliver 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 Justin, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 940-202-1184 today.