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 offer both heating and cooling.

But no home comfort system is flawless. There’s always a chance your mini-split can malfunction. To identify what went wrong, you’ll want to locate where the mini-split error codes are displayed. Knowing what these codes refer to can help you kick-start mini-split repair, especially if professional help is necessary.

What any code means will ultimately rely on the specific model of your mini-split system. You can check your manual to find a guide for what each code means. You can also call the HVAC pros at Gilray Heating and Cooling. Our technicians are trained to learn these codes in order to ensure prompt mini-split repair in Wausau. Give us a call at 715-301-0727 to request an appointment.

Common Lennox Mini-Split Error Codes

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

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

Are there clear signs of what malfunctioned? A loud noise coming from a specific 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 indicates that communication between the mini-split system’s indoor and outdoor units has been disrupted. It could 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 effectively balance indoor temperatures.

E5 – Voltage Protection or Temperature Sensor Error

If you own a mini-split heat pump, an E5 error may refer to a problem with the system’s voltage. A repair technician from Gilray Heating and Cooling 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 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, 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 generally be related to your mini-splits compressor system, found within the outdoor unit. When the compressor drive is malfunctioning, the most likely reason is excessively high temperatures. A high temperature at the discharge line can 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 damaged, 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 experiencing high or low pressure concerns.

Check the Manual for Your Specific 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 typically needed.

Call Gilray Heating and Cooling for Mini-Split Repair

Gilray Heating and Cooling 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 identify 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 Wausau, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 715-301-0727 today.