If your LG Washer is showing error code HS, the machine has detected that the hot and cold water supply hoses may be connected in reverse — hot water is entering where cold water is expected, or vice versa. Error HS is a supply reversal warning specific to certain LG Washer models that monitor inlet water temperature. Here is how to fix it.

⚡ Quick Fix – Top 3 Steps

1. Check that the hot and cold inlet hoses are connected correctly at the back of the machine. The LG Washer’s rear inlet ports are clearly labelled HOT and COLD. The hot water hose (usually marked with a red band or fitting) must connect to the HOT port, and the cold water hose (blue band or fitting) to the COLD port. Turn off the water supply, swap the hoses if they are reversed, and turn the supply back on.
2. Verify your home’s hot water supply is actually hot. If the hoses are correctly connected but the hot water pipe is not supplying hot water (for example, if the boiler is off or the hot water tap has been accidentally connected to a cold feed), the sensor may trigger HS. Check by running the hot tap at a nearby sink to confirm hot water is being supplied.
3. Reset the washer after correcting the hose connections. After confirming and correcting the inlet hose orientation, press Power to restart the machine. Select a wash cycle and press Start. If HS was caused solely by reversed hoses, it will not appear again.

What Does LG Washer Error HS Mean?

Error HS stands for Hot/Cold Supply error (also described as a supply hose reversal warning). Some LG Washer models — particularly older models that had both hot and cold water inlets — use a thermistor at each inlet to confirm water temperature. If hot water enters through the cold inlet, or cold water through the hot inlet, the sensors detect the mismatch and the board displays HS to prevent the wash cycle from running with incorrect water temperatures.

Modern cold-fill LG Washers (which use only a single cold water inlet and heat water internally) will not display HS related to supply reversal. If you see HS on a single-inlet model, it may be a model-specific thermistor or sensor reading variant — consult your model’s user manual.

Common Causes of LG Washer Error HS

• Reversed inlet hoses: Hot and cold hoses connected to the wrong ports after installation or a recent move.
• No hot water supply: The hot water supply to the home is off, causing the hot inlet to receive no water or cold water only.
• Faulty inlet thermistor: A sensor at the inlet port is reading incorrectly and falsely reporting reversed supply temperatures.

Related LG Washer Errors

• LG Washer Error IE — Water inlet error
• LG Washer Error tE — Temperature sensor error
• LG Washer Error HE — Heater error
• LG Washer Error Codes – Complete Guide