Lennox Mini Split Error Codes and What They Could Mean

October 25, 2021

Lennox mini split systems are a solid 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 could malfunction. To find out what happened, 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 needed.

What the error code means will ultimately depend 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 Jent Mechanical LLC. Our technicians are trained to recognize these codes in order to ensure prompt mini split repair in Dayton. Give us a call at 937-845-1111 to request 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 come across. To learn what your error code may mean, consider the following:

  • Is your system 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 some 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 hampered. It might be struggling with intermittent connection issues or have failed entirely. When the indoor and outdoor units can’t communicate with one another, it will be unable to adequately balance indoor temperatures.

E5 – Voltage Protection or Temperature Sensor Error

If you own a mini split heat pump, an E5 error can refer to a problem with the system’s voltage. A repair technician from Jent Mechanical LLC may refer to it as overcurrent protection. Both unusually high or low voltage can result in this error code.

For mini split air conditioners, this code may 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, 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 concerned with your mini splits compressor system, found within the outdoor unit. When the compressor drive is faulty, the most likely reason is excessively high temperatures. A high temperature at the discharge line can also result in 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 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 manage the outdoor compressor. If this switch is open, the P6 code may appear. You may also find the P6 code if the compressor is experiencing high or low pressure issues.

Consult the Manual for Your Specific Model

Remember 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 often necessary.

Call Jent Mechanical LLC for Mini Split Repair

Jent Mechanical LLC 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 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 Dayton, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 937-845-1111 today.