Lennox mini-split systems are an excellent 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 possibility your mini-split could malfunction. To identify what went wrong, 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 needed.

What the error code means will ultimately depend on the specific model of your mini-split system. You can review your manual for a guide for what each code means. You can also trust the HVAC pros at Edington Heating & Cooling Inc. Our technicians are trained to recognize these codes in order to deliver prompt mini-split repair in Troy. Give us a call at 937-558-9478 to book an appointment.

Common Error Codes for Lennox Mini Splits

While error codes can differ from model to model, there are some codes you’ll be more likely to see. To identify what your error code might mean, consider the following:

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

Are there other signs of what malfunctioned? A loud 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 means that communication between the mini-split system’s indoor and outdoor units has been disrupted. It might be struggling with intermittent connection problems or have failed entirely. When the indoor and outdoor units can’t communicate with one another, it will be unable to properly balance indoor temperatures.

E5 – Voltage Protection or Temperature Sensor Error

If you own a mini-split heat pump, an E5 error can refer to a problem with the system’s voltage. A repair technician from Edington Heating & Cooling 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 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 may also result in 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 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 may appear. You may also find the P6 code if the compressor is struggling with high or low pressure concerns.

Check the Manual for the Exact Model

Keep in mind that in general, error codes are specific to each model of a Lennox mini-split system. Your manual will provide a guide for these error codes and what they can mean. But as many of these codes start with electrical problems, professional experience is usually needed.

Contact Edington Heating & Cooling Inc for Mini-Split Repair

Edington Heating & Cooling Inc 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 Troy, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 937-558-9478 today.