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 offer both heating and cooling.

But no home comfort system is flawless. There’s always a risk your mini-split could malfunction. To determine what is malfunctioning, you should 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 required.

What any code means will ultimately rely on the specific model of your mini-split system. You can review your manual to find a guide for what each code means. You can also contact the HVAC pros at Central Heating & Plumbing. Our technicians are trained to recognize these codes in order to provide prompt mini-split repair in New Castle. Give us a call at 724-401-1843 to book an appointment.

What Error Codes for Lennox Mini Splits Are Most Common?

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

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

Are there other signs of what malfunctioned? A strange 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 means that communication between the mini-split system’s indoor and outdoor units has been hampered. It may 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 can stand for a problem with the system’s voltage. A repair technician from Central Heating & Plumbing may refer to it as overcurrent protection. Both unusually high or low voltage can create 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 might 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 not working, the most likely culprit is excessively high temperatures. A high temperature at the discharge line can also trigger 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 may appear. You may also find the P6 code if the compressor is struggling with high or low pressure issues.

Check the Manual for Specifics

Don’t forget that in general, error codes are specific to each model of a Lennox mini-split system. Your manual will offer a guide for these error codes and what they can mean. But since many of these codes stem from electrical problems, professional experience is typically required.

Call Central Heating & Plumbing for Mini-Split Repair

Central Heating & Plumbing 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 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 New Castle, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 724-401-1843 today.