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 piece of HVAC equipment is flawless. There’s always a possibility your mini-split will malfunction. To determine what is malfunctioning, you should 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 necessary.

What each 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 call the HVAC pros at Indoor Comfort Systems HVAC. Our technicians are trained to recognize these codes in order to provide prompt mini-split repair in Croydon. Give us a call at 215-741-5505 to request an appointment.

Common Error Codes for Lennox Mini Splits

While error codes may differ from model to model, there are some codes you’ll be more likely to see. To learn what your error code could 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 few of the more common error codes for Lennox mini-splits.

E1 – Indoor / Outdoor Unit Communication

In general, an E1 error code means that communication between the mini-split system’s indoor and outdoor units has been disrupted. 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 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 may refer to a problem with the system’s voltage. A repair technician from Indoor Comfort Systems HVAC may refer to it as overcurrent protection. Both very high or low voltage can produce this error code.

For mini-split air conditioners, this code can also represent 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, similar to an E1 code. It might also be a problem with one of the temperature sensors.

P4 – Compressor Drive Error / High Temperature

A P4 error code will usually be related to your mini-splits compressor system, housed within the outdoor unit. When the compressor drive is malfunctioning, the most likely cause 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 control the outdoor compressor. If this switch is open, the P6 code could appear. You may also find the P6 code if the compressor is facing high or low pressure issues.

Check the Manual for Specifics

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 start with electrical problems, professional experience is typically necessary.

Trust Indoor Comfort Systems HVAC for Mini-Split Repair

Indoor Comfort Systems HVAC can provide 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 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 Croydon, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 215-741-5505 today.