Lennox mini-split systems are an excellent 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 ductless mini-split is flawless. There’s always a possibility your mini-split could malfunction. To find out what happened, you’ll want to locate where the mini-split error codes are displayed. Understanding what these codes mean can help you kick-start mini-split repair, especially if professional help is needed.

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 contact the HVAC pros at Tokay. Our technicians are trained to learn these codes in order to provide prompt mini-split repair in Lodi. Give us a call at 209-257-3156 to book 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 encounter. To determine what your error code could mean, consider the following:

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

Are there additional signs of what malfunctioned? A strange noise coming from an important component, for example.

Here are some of the more common error codes for Lennox mini-splits.

E1 – Indoor / Outdoor Unit Communication

In general, an E1 error code signifies that communication between the mini-split system’s indoor and outdoor units has been disrupted. It could be facing 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 adequately balance indoor temperatures.

E5 – Voltage Protection or Temperature Sensor Error

If you own a mini-split heat pump, an E5 error could stand for a problem with the system’s voltage. A repair technician from Tokay 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 may also represent 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 generally be connected to 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 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 malfunctioning, a P6 error code is common.

When temperatures exceed safe levels, a safety switch should 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 could appear. You may also find the P6 code if the compressor is struggling with high or low pressure concerns.

Check Your 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 offer a guide for these error codes and what they should mean. But because many of these codes start with electrical problems, professional experience is usually required.

Contact Tokay for Mini-Split Repair

Tokay 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 specific 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 Lodi, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 209-257-3156 today.