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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 ductless mini split is flawless. There’s always a risk your mini split could malfunction. To find out what went wrong, 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 required.

What the error code means will ultimately rely on the specific model of your mini split system. You can consult your manual for a guide for what each code means. You can also trust the HVAC pros at Contra Costa Heating & AC. Our technicians are trained to recognize these codes in order to provide prompt mini split repair in the Bay Area. Give us a call at 510-343-9841 to schedule 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 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 other signs of what is happening? 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 could be facing intermittent connection issues 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 can indicate a problem with the system’s voltage. A repair technician from Contra Costa Heating & AC 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 could 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, like 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 most times be related to your mini splits compressor system, found within the outdoor unit. When the compressor drive is not working, the most likely culprit is excessively high temperatures. A high temperature at the discharge line may 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 damaged, 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 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 facing high or low pressure issues.

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

Call Contra Costa Heating & AC for Mini Split Repair

Contra Costa Heating & AC 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 diagnose your specific 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 the Bay Area, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 510-343-9841 today.