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 will malfunction. To find out what went wrong, you’ll want to locate where the mini-split error codes are displayed. Knowing what these codes refer to can help ensure fast mini-split repair, especially if professional help is needed.
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 trust the HVAC pros at B & B Heating & Cooling. Our technicians are trained to recognize these codes in order to ensure prompt mini-split repair in Florissant and St. Charles. Give us a call at 314-325-7552 to request an appointment.
Common Error Codes for Lennox Mini Splits
While error codes will differ from model to model, there are some codes you’ll be more likely to see. To identify 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 other signs of what is happening? A loud 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 signifies that communication between the mini-split system’s indoor and outdoor units has been disrupted. It might be experiencing intermittent connection problems or have failed entirely. When the indoor and outdoor units can’t communicate with one another, it will be unable to properly balance indoor temperatures.
E5 – Voltage Protection or Temperature Sensor Error
If you own a mini-split heat pump, an E5 error can refer to a problem with the system’s voltage. A repair technician from B & B Heating & Cooling may refer to it as overcurrent protection. Both unusually high or low voltage can create this error code.
For mini-split air conditioners, this code may 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 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, 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 can 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 malfunctioning, 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 can appear. You may also find the P6 code if the compressor is struggling with high or low pressure issues.
Consult the Manual for the Exact Model
Keep in mind that in general, error codes are different for each model of a Lennox mini-split system. Your manual will provide a guide for these error codes and what they can mean. But as many of these codes stem from electrical problems, professional experience is often necessary.
Contact B & B Heating & Cooling for Mini-Split Repair
B & B Heating & Cooling 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 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 Florissant and St. Charles, bringing your new system online with minimal comfort disruption.
To schedule an appointment, give us a call at 314-325-7552 today.