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 deliver both heating and cooling.

But no piece of HVAC equipment is flawless. There’s always a risk your mini-split will malfunction. To determine what happened, 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 needed.

What the error code means will ultimately depend on the specific model of your mini-split system. You can check your manual to find a guide for what each code means. You can also trust the HVAC pros at Stieferman Heating Company Inc. Our technicians are trained to recognize these codes in order to ensure prompt mini-split repair in Jefferson City. Give us a call at 573-635-3547 to schedule 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 can mean, ask yourself 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 strange noise coming from a key 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 means that communication between the mini-split system’s indoor and outdoor units has been hampered. It may 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 properly 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 Stieferman Heating Company Inc 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 can also stand for 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, similar to 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 most times be connected to your mini-splits compressor system, located 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 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 malfunctioning, 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.

Check Your Manual for Specifics

Don’t forget that in general, error codes are different for each model of a Lennox mini-split system. Your manual will have a guide for these error codes and what they should mean. But since many of these codes start with electrical problems, professional experience is usually needed.

Contact Stieferman Heating Company Inc for Mini-Split Repair

Stieferman Heating Company Inc 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 identify your unique 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 Jefferson City, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 573-635-3547 today.