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CH44: DC Link Voltage Error (LG)

LG heat pump inverter DC link voltage is outside the acceptable operating range.

What This Error Code Means

The DC bus voltage in the inverter drive is too high or too low for safe compressor operation.

Common Causes

  • Utility power supply fluctuation
  • Inverter PCB fault
  • Main capacitor bank failure
  • Rectifier diode failure
  • Loose power connection

Affected Brands

LG

How ROMA Heating Fixes This

  • Measure incoming AC voltage
  • Check DC link voltage at inverter
  • Inspect main capacitors for bulging or leaking
  • Test rectifier diodes
  • Replace inverter PCB if voltage out of range

Why Trust ROMA Heating

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