Lennox Mini-Split Error Codes and What They Could Mean

Lennox mini-split systems are a great 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 piece of HVAC equipment is flawless. There’s always a risk your mini-split can malfunction. To identify what is malfunctioning, you’ll want to locate where the mini-split error codes are displayed. Recognizing what these codes refer to can help you kick-start mini-split repair, especially if professional help is necessary.

What the error 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 trust the HVAC pros at ACE Solutions. Our technicians are trained to learn these codes in order to provide prompt mini-split repair in Hasbrouck Heights. Give us a call at 201-579-2562 to schedule 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 learn what your error code can 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 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 indicates that communication between the mini-split system’s indoor and outdoor units has been impeded. It might be experiencing 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 could refer to a problem with the system’s voltage. A repair technician from ACE Solutions may refer to it as overcurrent protection. Both very high or low voltage can create this error code.

For mini-split air conditioners, this code could 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, like 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 connected 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 lead to 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 faulty, 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.

Consult 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 have a guide for these error codes and what they should mean. But since many of these codes refer to electrical problems, professional experience is often necessary.

Contact ACE Solutions for Mini-Split Repair

ACE Solutions 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 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 Hasbrouck Heights, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 201-579-2562 today.