Lennox mini-split systems are an excellent way to provide compact, yet powerful 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 ductless mini-split is flawless. There’s always a possibility your mini-split will malfunction. To identify what went wrong, you’ll want to locate where the mini-split error codes are displayed. Understanding what these codes refer to can help you kick-start mini-split repair, especially if professional help is necessary.

What each code means will ultimately rely on the specific model of your mini-split system. You can consult your manual for a guide for what each code means. You can also trust the HVAC pros at Fire & Ice HVAC. Our technicians are trained to recognize these codes in order to deliver prompt mini-split repair in Manassas. Give us a call at 703-595-4157 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 encounter. To identify what your error code may mean, consider the following:

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

Are there other signs of what malfunctioned? A loud noise coming from a key 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 signifies that communication between the mini-split system’s indoor and outdoor units has been hampered. 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 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 could refer to a problem with the system’s voltage. A repair technician from Fire & Ice HVAC may refer to it as overcurrent protection. Both unusually high or low voltage can produce this error code.

For mini-split air conditioners, this code could also stand for 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 may 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 malfunctioning, the most likely reason is excessively high temperatures. A high temperature at the discharge line could 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 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 control the outdoor compressor. If this switch is open, the P6 code can appear. You may also find the P6 code if the compressor is facing high or low pressure issues.

Consult the Manual for the Exact Model

Remember 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 should mean. But as many of these codes refer to electrical problems, professional experience is often necessary.

Call Fire & Ice HVAC for Mini-Split Repair

Fire & Ice HVAC can provide 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 Manassas, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 703-595-4157 today.