Lennox Mini Split Error Codes and What They Might 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 deliver both heating and cooling.

But no piece of HVAC equipment is flawless. There’s always a chance your mini split will malfunction. To determine what is malfunctioning, you should locate where the mini split error codes are displayed. Recognizing 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 to find a guide for what each code means. You can also contact the HVAC pros at Cool Power LLC . Our technicians are trained to learn these codes in order to provide prompt mini split repair in Ronkonkoma. Give us a call at 631-246-4029 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 encounter. 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 clear signs of what is happening? A loud noise coming from a key 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 hampered. It may be experiencing 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 effectively 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 Cool Power LLC 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 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, located 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 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 malfunctioning, a P6 error code is common.

When temperatures exceed safe levels, a safety switch should 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 struggling with high or low pressure concerns.

Check the Manual for Your Specific Model

Don’t forget that in general, error codes are specific to each model of a Lennox mini split system. Your manual will offer a guide for these error codes and what they should mean. But because many of these codes stem from electrical problems, professional experience is often necessary.

Call Cool Power LLC for Mini Split Repair

Cool Power 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 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 Ronkonkoma, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 631-246-4029 today.