If your manual states it is a water sensor problem then you are probably looking at an LS3 manual not an LS5. LS3 error 3 is "Chamber did not fill with water which is different to LS5 error 3.
Change the door switch...
Error 3 is a Door lock error and has nothing to do with the water sensor. Tighten the door down snuggly, but don't over-tighten. If it still doesn't work it may need a door rebuild or switch replacement. Call for service if it doesn't restart.
Here is a list of errors for your machine.
I hope they help you.
SAMSUNG WASHING MACHINES, ERROR FUNCTIONS
When an error occurs, the alarm noise will sound and the error code displayed in the program window. Listed below is a series of error codes you may or may not see for your model of Samsng Washing Machine. The errors are shown as blinking in O.5 second intervals until the error status has cleared. In this case, all the driving devices are turned off until the error is cleared.
1. WATER SUPPLY ERROR - Display shows 4E.
Water Supply Error occurs when water level frequency does not show changes more than 100Hz or water is not supplied up to the preset water level after 10 Minutes or more at the time of initial water supply. The error status can be cleared by turning the POWER switch OFF and back ON.
2. WATER DRAIN ERROR - Display shows 5E.
5E is displayed if the water level frequency detected is 25 KHz or less in the initial phase of the UNB -detecting cycle. The Water Drain error can be cleared by turning POWER SW OFF and back ON.
3. OVER-FLOW ERROR - Display shows oE.
Over-Flow error occurs when the water level is too high. It can be cleared by turning POWER switch OFF. Water is drained prior to POWER switch OFF. The tub is drained for 2 minutes if a frequency of more than 25 KHz is detected.
4. UNBALANCE ERROR - Display shows UE.
Laundry load is unbalanced, manually loosen any tangled laundry.
If only one item of clothing needs washing, such as a bathrobe or jeans, the final spin result might be unsatisfactory and an UE error message will be shown in the display. Unbalance error is cleared by POWER switch OFF and back ON.
5. WATER HEATER ERROR - Display shows HE, HE1.
HE, HE1 is displayed if the water temperature rises by 7 C or more in 1 Min or by 2 C or less 20 Min after heating process has started. The error can be cleared by turning POWER switch OFF.
6. WATER PRESSURE SWITCH ERROR - Display shows 1 E.
* Generated Frequency Signal of WATER LEVEL (WIL) SIW (KHz)
Normal Level = Abnormal W/L Frequency
Low Level = 30.00 Khz
High Level = 15.00 Khz
If the same signal is detected for more than 5 seconds, it is a PRESSURE SWITCH Error. When this error occurs the drain pump will operate for 3 min. and the display will show 1 E indicating a pressure switch error.
7. ABNORMAL WATER TEMPERATURE ERROR- Display shows cE.
e.g. If the water temperature is 50 C or more, during a Delicate or Wool cycle.
At the time of initial water supply, if the water temperature is not appropriate, the display will show cE. This error can be cleared by POWER SWITCH OFF.
8. WATER LEAKAGE ERROR - Display shows 11 E.
Water Leakage error occurs when the water drains naturally, (by leakage) after the washing program starts.
9. THERMISTOR ERROR - Display shows tE
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