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 ductless mini-split is flawless. There’s always a chance your mini-split can malfunction. To identify what is malfunctioning, you’ll want to locate where the mini-split error codes are displayed. Knowing 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 Kohles & Bach Heating & Cooling. Our technicians are trained to recognize these codes in order to ensure prompt mini-split repair in Des Moines. Give us a call at 515-207-6569 to schedule an appointment.

Common Lennox Mini-Split Error Codes

While error codes may differ from model to model, there are some codes you’ll be more likely to come across. To learn 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 clear signs of what malfunctioned? A loud 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 signifies that communication between the mini-split system’s indoor and outdoor units has been hampered. It might be struggling with 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 effectively balance indoor temperatures.

E5 – Voltage Protection or Temperature Sensor Error

If you own a mini-split heat pump, an E5 error can stand for a problem with the system’s voltage. A repair technician from Kohles & Bach Heating & Cooling may refer to it as overcurrent protection. Both very high or low voltage can produce this error code.

For mini-split air conditioners, this code can 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, similar to an E1 code. It may also be a problem 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 not working, the most likely reason 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 damaged, a P6 error code is common.

When temperatures rise above safe levels, a safety switch will 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 may appear. You may also find the P6 code if the compressor is experiencing high or low pressure concerns.

Consult 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 have a guide for these error codes and what they can mean. But since many of these codes start with electrical problems, professional experience is often required.

Call Kohles & Bach Heating & Cooling for Mini-Split Repair

Kohles & Bach Heating & Cooling 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 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 Des Moines, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 515-207-6569 today.