Lennox Mini-Split Error Codes and What They Could Mean

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 chance your mini-split can malfunction. To determine what went wrong, you’ll want to locate where the mini-split error codes are displayed. Understanding what these codes refer to can help ensure fast 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 for a guide for what each code means. You can also call the HVAC pros at Central Air LLC. Our technicians are trained to learn these codes in order to deliver prompt mini-split repair in Brookfield. Give us a call at 203-357-5913 to book an appointment.

Common Error Codes for Lennox Mini Splits

While error codes may differ from model to model, there are some codes you’ll be more likely to see. To determine 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 a key 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 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 not be able to properly balance indoor temperatures.

E5 – Voltage Protection or Temperature Sensor Error

If you own a mini-split heat pump, an E5 error may stand for a problem with the system’s voltage. A repair technician from Central Air LLC may refer to it as overcurrent protection. Both excessively high or low voltage can produce 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 usually be connected to your mini-splits compressor system, housed within the outdoor unit. When the compressor drive is malfunctioning, the most likely culprit 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 make sure the indoor and outdoor units can communicate with one another. If the drive board is faulty, a P6 error code is common.

When temperatures rise above safe levels, a safety switch should 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 could appear. You may also find the P6 code if the compressor is facing high or low pressure issues.

Review Your 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 provide a guide for these error codes and what they should mean. But because many of these codes refer to electrical problems, professional experience is typically required.

Trust Central Air LLC for Mini-Split Repair

Central Air LLC 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 might 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 Brookfield, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 203-357-5913 today.