Lennox Mini Split Error Codes and What They Could Mean

October 25, 2021

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 deliver both heating and cooling.

But no ductless mini split is flawless. There’s always a risk your mini split will malfunction. To identify what happened, you should 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 each code means will ultimately depend on the specific model of your mini split system. You can consult your manual to find a guide for what each code means. You can also contact the HVAC pros at Paso Robles Heating and Air. Our technicians are trained to recognize these codes in order to provide prompt mini split repair in Paso Robles. Give us a call at 805-203-8667 to book an appointment.

Common Lennox Mini Split Error Codes

While error codes can differ from model to model, there are some codes you’ll be more likely to come across. To determine 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 clear signs of what is happening? A strange noise coming from a specific 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 hampered. It may be facing intermittent connection problems or have failed entirely. When the indoor and outdoor units can’t communicate with one another, it will be unable to properly balance indoor temperatures.

E5 – Voltage Protection or Temperature Sensor Error

If you own a mini split heat pump, an E5 error may indicate a problem with the system’s voltage. A repair technician from Paso Robles Heating and Air may refer to it as overcurrent protection. Both very high or low voltage can result in 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 an issue with one of the temperature sensors.

P4 – Compressor Drive Error / High Temperature

A P4 error code will usually be concerned with your mini splits compressor system, found within the outdoor unit. When the compressor drive is faulty, 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 faulty, 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 facing high or low pressure concerns.

Review the Manual for Your Specific Model

Don’t forget that in general, error codes are different for each model of a Lennox mini split system. Your manual will have a guide for these error codes and what they should mean. But as many of these codes refer to electrical problems, professional experience is typically needed.

Call Paso Robles Heating and Air for Mini Split Repair

Paso Robles Heating and Air 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 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 Paso Robles, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 805-203-8667 today.