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 could malfunction. To find out what went wrong, you should 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 any code means will ultimately rely on the specific model of your mini-split system. You can consult your manual to find a guide for what each code means. You can also call the HVAC pros at B & G HVAC. Our technicians are trained to learn these codes in order to provide prompt mini-split repair in Marshalltown. Give us a call at 641-316-3360 to request an appointment.
Common Lennox Mini-Split Error Codes
While error codes will differ from model to model, there are some codes you’ll be more likely to see. To determine 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 clear signs of what malfunctioned? A strange noise coming from a key 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 disrupted. 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 effectively balance indoor temperatures.
E5 – Voltage Protection or Temperature Sensor Error
If you own a mini-split heat pump, an E5 error could refer to a problem with the system’s voltage. A repair technician from B & G HVAC 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, like 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 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 ensure 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 experiencing high or low pressure issues.
Check the Service 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 as many of these codes start with electrical problems, professional experience is typically necessary.
Trust B & G HVAC for Mini-Split Repair
B & G HVAC can deliver 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 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 Marshalltown, bringing your new system online with little to no comfort disruption.
To schedule an appointment, give us a call at 641-316-3360 today.