Lennox mini-split systems are a great way to provide compact, yet effective 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 could malfunction. To find out what is malfunctioning, you should locate where the mini-split error codes are displayed. Understanding what these codes refer to 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 for a guide for what each code means. You can also trust the HVAC pros at AW Heating & Air Conditioning. Our technicians are trained to recognize these codes in order to deliver prompt mini-split repair in Lincoln. Give us a call at 402-438-7992 to request an appointment.

Common Error Codes for Lennox Mini Splits

While error codes will differ from model to model, there are some codes you’ll be more likely to encounter. To identify what your error code might 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 malfunctioned? A strange noise coming from a specific 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 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 could refer to a problem with the system’s voltage. A repair technician from AW Heating & Air Conditioning may refer to it as overcurrent protection. Both unusually high or low voltage can produce this error code.

For mini-split air conditioners, this code could also stand for 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 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, located within the outdoor unit. When the compressor drive is not working, 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 malfunctioning, 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 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 Your Service Manual for Specifics

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 often needed.

Trust AW Heating & Air Conditioning for Mini-Split Repair

AW Heating & Air Conditioning 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 unique 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 Lincoln, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 402-438-7992 today.