Lennox Mini Split Error Codes and What They Could 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 provide both heating and cooling.

But no ductless mini split is flawless. There’s always a risk your mini split will malfunction. To find out what happened, you should locate where the mini split error codes are displayed. Knowing what these codes mean can help ensure fast mini split repair, especially if professional help is needed.

What each 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 Garoken Energy Co. Inc.. Our technicians are trained to learn these codes in order to deliver prompt mini split repair in Beaverton. Give us a call at 503-374-1934 to book 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, ask yourself the following:

  • Is your model a mini split air conditioner or a mini split heat pump?
  • Are there additional signs of what is happening? A loud 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 indicates that communication between the mini split system’s indoor and outdoor units has been impeded. It could be experiencing intermittent connection issues 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 could refer to a problem with the system’s voltage. A repair technician from Garoken Energy Co. Inc. 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 may also indicate 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 could also be an issue 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, located 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 can also lead to 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 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 experiencing high or low pressure issues.

Consult 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 provide a guide for these error codes and what they should mean. But because many of these codes start with electrical problems, professional experience is often necessary.

Call Garoken Energy Co. Inc. for Mini Split Repair

Garoken Energy Co. Inc. can deliver 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 Beaverton, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 503-374-1934 today.