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Lennox Mini Split Error Codes and What They Might Mean

October 25, 2021

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 deliver both heating and cooling.

But no piece of HVAC equipment 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. Recognizing what these codes refer to can help ensure fast mini split repair, especially if professional help is needed.

What the error code means will ultimately depend on the specific model of your mini split system. You can check your manual to find a guide for what each code means. You can also trust the HVAC pros at Three Rivers Heating & Cooling. Our technicians are trained to learn these codes in order to provide prompt mini split repair in Portland. Give us a call at 503-213-4433 to schedule an appointment.

Common Lennox Mini Split Error Codes

While error codes will differ from model to model, there are some codes you’ll be more likely to see. To determine what your error code might 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 impeded. It might be facing 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 stand for a problem with the system’s voltage. A repair technician from Three Rivers Heating & Cooling may refer to it as overcurrent protection. Both excessively high or low voltage can result in this error code.

For mini split air conditioners, this code may 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, like an E1 code. It might also be an issue with one of the temperature sensors.

P4 – Compressor Drive Error / High Temperature

A P4 error code will generally be concerned with your mini splits compressor system, found within the outdoor unit. When the compressor drive is faulty, the most likely cause is excessively high temperatures. A high temperature at the discharge line may 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 rise above 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 can appear. You may also find the P6 code if the compressor is struggling with high or low pressure concerns.

Review the Manual for Your Specific Model

Keep in mind that in general, error codes are different for each model of a Lennox mini split system. Your manual will provide a guide for these error codes and what they can mean. But because many of these codes refer to electrical problems, professional experience is often required.

Call Three Rivers Heating & Cooling for Mini Split Repair

Three Rivers 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 diagnose your specific 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 Portland, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 503-213-4433 today.