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 ductless mini-split is flawless. There’s always a possibility your mini-split can malfunction. To identify what happened, you’ll want to locate where the mini-split error codes are displayed. Knowing what these codes mean can help ensure fast mini-split repair, especially if professional help is required.

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 contact the HVAC pros at Cytech Heating & Cooling L.C.. Our technicians are trained to recognize these codes in order to provide prompt mini-split repair in McAllen. Give us a call at 956-553-3265 to schedule an appointment.

What Error Codes for Lennox Mini Splits Are Most Common?

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 might mean, ask yourself the following:

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

Are there clear signs of what is happening? A strange noise coming from an important 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 signifies that communication between the mini-split system’s indoor and outdoor units has been hampered. It could be facing intermittent connection problems 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 indicate a problem with the system’s voltage. A repair technician from Cytech Heating & Cooling L.C. 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 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 may also be a problem 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, found within the outdoor unit. When the compressor drive is faulty, the most likely culprit is excessively high temperatures. A high temperature at the discharge line could also trigger 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 faulty, a P6 error code is common.

When temperatures rise above 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 could appear. You may also find the P6 code if the compressor is experiencing high or low pressure issues.

Check Your Service Manual for Your Specific Model

Remember 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 stem from electrical problems, professional experience is typically required.

Trust Cytech Heating & Cooling L.C. for Mini-Split Repair

Cytech Heating & Cooling L.C. 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 unique 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 McAllen, bringing your new system online with minimal comfort disruption.

To schedule an appointment, give us a call at 956-553-3265 today.