Error, fault and alarm codes of products - what each code means, its causes and what to do - read from the manufacturers’ manuals, with the manual page each answer comes from.
The indoor unit cannot receive the signal from the Wired Remote Control for more than 1 minute during normal operation. The manual's first action is: “-Check the connection of terminal between remote control and indoo…
Low pressure error occurs when suction pressure drops below 7.35 PSI for five minutes and repeats five times within two hours. The manual's first action is: “-Check if 3-way valve (gas side) is open. -Checked strainer…
Compressor temperature error occurs when compressor temperature exceeds 236°F (107.8°C) twice in 24 hours. The manual's first action is: “-Check EEV, strainer. (Ref. Service Tip #001-Discharge Temperature Thermistor E…
Discharge temperature error occurs when discharge temperature exceeds 23°F (110°C) twice in 24 hours. The manual's first action is: “-Check if 3-way valve is open. -Check EEV, strainer. (Ref. Service Tip #001-HFI Disc…
The 4-way valve error code indicates the compressor stops when indoor heat exchanger temp minus room temp exceeds 20°F (cooling) or falls below -20°F (heating). The manual lists no action for this code.
Heat sink thermistor error indicates the heat sink temperature thermistor is open or shorted. The manual's first action is: “-Check for erroneous connection or removed connector.”
Outdoor thermistor error detected when outdoor temperature thermistor is open or short-circuited. The manual's first action is: “-Check connection of connector, loose, erroneous connection.”
Heat Exchanger (Pipe) Thermistor Error – When heat exchanger temperature thermistor open or short-circuit is detected at power up or while running the compressor. The manual's first action is: “-Check connection of co…
Compressor thermistor error detected when the compressor temperature sensor is open or short-circuited while powered on or running. The manual's first action is: “-Check for erroneous connection or removed connector.”
Discharge thermistor error detected when the thermistor is open or short-circuited during power-up or compressor operation. The manual's first action is: “-Check connection of connector, loose, erroneous connection.”
IPM error / Trip terminal I error indicates abnormal current at the IPM due to blocked heat radiation. The manual's first action is: “-Check connections of outdoor unit electrical components.”
Active filter / PFC Circuit error code 64 indicates abnormal DC voltage levels or repeated power interruptions. The manual's first action is: “-Check external cause at the indoor or outdoor (voltage drop or noise).”
Inverter error indicates a problem with the inverter's transistor PCB. The manual's first action is: “Check connection of molex plugs on inverter PCB for loose connections.”
Outdoor unit main PCB error The manual's first action is: “Check external cause; voltage drop, poor ground connection.”
The system has detected a problem with the drain pump. The manual's first action is: “Check connector of (CN9) / wire.”