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You may also find the P6 code if the compressor is struggling with high or low pressure issues. If this switch is open, the P6 code could appear. 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 the drive board is faulty, a P6 error code is common. Your mini split system will have computer boards that make sure the indoor and outdoor units can communicate with one another. P6 – Compressor Switch Open or Drive Board Failure A high temperature at the discharge line may also lead to a P4 code. When the compressor drive is not working, the most likely cause is excessively high temperatures. P4 – Compressor Drive Error / High TemperatureĪ P4 error code will generally be related to your mini splits compressor system, housed within the outdoor unit. It could also be an issue with one of the temperature sensors. E6 – Indoor / Outdoor Unit CommunicationĪn E6 error code can also refer to a communication problem between the two units, similar to an E1 code. In other cases, it’s alerting you to a circuit problem with the outdoor temperature sensor. Both very high or low voltage can produce this error code.įor mini split air conditioners, this code can also stand for voltage issues. A repair technician from US Air Heating and Cooling may refer to it as overcurrent protection. If you own a mini split heat pump, an E5 error can indicate a problem with the system’s voltage. E5 – Voltage Protection or Temperature Sensor Error When the indoor and outdoor units can’t communicate with one another, it will not be able to effectively balance indoor temperatures. It might be experiencing intermittent connection issues or have failed entirely. In general, an E1 error code indicates that communication between the mini split system’s indoor and outdoor units has been impeded. Here are a handful of the more common error codes for Lennox mini splits.
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