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 offer both heating and cooling.

But no home comfort system is flawless. There’s always a possibility your mini-split can malfunction. To find out what happened, you should locate where the mini-split error codes are displayed. Understanding what these codes mean can help ensure fast mini-split repair, especially if professional help is necessary.

What any code means will ultimately depend 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 call the HVAC pros at Struven Heating & Cooling. Our technicians are trained to learn these codes in order to ensure prompt mini-split repair in Crown Point. Give us a call at 219-292-0956 to request 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 may mean, ask yourself the following:

Is your system a mini-split air conditioner or a mini-split heat pump?

Are there other signs of what is happening? A loud 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 signifies that communication between the mini-split system’s indoor and outdoor units has been disrupted. 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 adequately balance indoor temperatures.

E5 – Voltage Protection or Temperature Sensor Error

If you own a mini-split heat pump, an E5 error may stand for a problem with the system’s voltage. A repair technician from Struven Heating & Cooling may refer to it as overcurrent protection. Both very high or low voltage can create 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 usually be connected to 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 could also lead to 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 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 struggling with high or low pressure concerns.

Check Your Service Manual for the Exact Model

Keep in mind that in general, error codes are specific to 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 start with electrical problems, professional experience is usually needed.

Call Struven Heating & Cooling for Mini-Split Repair

Struven 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 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 Crown Point, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 219-292-0956 today.