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 home comfort system is flawless. There’s always a risk your mini-split can 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 you kick-start 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 for a guide for what each code means. You can also call the HVAC pros at May's Heating & Air. Our technicians are trained to learn these codes in order to ensure prompt mini-split repair in Frederick. Give us a call at 301-690-0397 to schedule an appointment.
Common Lennox Mini-Split Error Codes
While error codes can differ from model to model, there are some codes you’ll be more likely to come across. To determine what your error code might mean, ask yourself the following:
Is your system a mini-split air conditioner or a mini-split heat pump?
Are there additional signs of what is happening? A strange noise coming from a specific 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 means that communication between the mini-split system’s indoor and outdoor units has been impeded. It might 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 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 May's Heating & Air may refer to it as overcurrent protection. Both excessively high or low voltage can result in this error code.
For mini-split air conditioners, this code could 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, like 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 generally be related to your mini-splits compressor system, found within the outdoor unit. When the compressor drive is not working, the most likely cause 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 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 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 may appear. You may also find the P6 code if the compressor is struggling with high or low pressure issues.
Check the Manual for Your Specific Model
Don’t forget 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 since many of these codes start with electrical problems, professional experience is often required.
Call May's Heating & Air for Mini-Split Repair
May's Heating & Air 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 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 Frederick, bringing your new system online with little to no comfort disruption.
To schedule an appointment, give us a call at 301-690-0397 today.