Lennox mini-split systems are an excellent way to provide compact, yet powerful 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 determine what went wrong, you’ll want to 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 needed.

What any code means will ultimately rely on the specific model of your mini-split system. You can check your manual for a guide for what each code means. You can also contact the HVAC pros at Herman Allen Plumbing, Heating & Cooling. Our technicians are trained to recognize these codes in order to ensure prompt mini-split repair in Greater Richmond. Give us a call at 804-302-6657 to book an appointment.

Common Error Codes for Lennox Mini Splits

While error codes can differ from model to model, there are some codes you’ll be more likely to come across. 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 other signs of what is happening? A loud noise coming from an important 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 might be facing intermittent connection problems 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 indicate a problem with the system’s voltage. A repair technician from Herman Allen Plumbing, Heating & Cooling 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 may 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, housed 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 result in 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 should 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 concerns.

Consult Your Manual for Your Specific Model

Keep in mind 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 should mean. But as many of these codes start with electrical problems, professional experience is typically necessary.

Trust Herman Allen Plumbing, Heating & Cooling for Mini-Split Repair

Herman Allen Plumbing, Heating & Cooling 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 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 Greater Richmond, bringing your new system online with little to no comfort disruption.

To schedule an appointment, give us a call at 804-302-6657 today.