Troubleshooting
Samsung Electronics 4-29
4-2-23. IPM(IGBT Module) heat sink error - (E474)
IPM overheat error - (E500)
Outdoor unit display
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Judgment Method
• Check if IPM is correctly assembled on the heat sink
• Check if the inlet is blocked.
• Replace the IPM.
Cause of problem
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4-2-24. Input current sensor error (Short/Open) - (E485)
Outdoor unit display
Judgment Method
• Check the input sensor while the set is in stop status.
• If error occurs, turn on/off the power several times. The same error occurs while the power is
off, replace the inverter PCB.
Cause of problem
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