I have a LG dishwasher that exhibits occasional groaning, 1E error and poor cleaning. Sometime it works fine but lately it's getting more common.

Dishwasher Error Codes. The 1E and/or the OE Error Code is caused by blockage preventing the unit from draining proplerly. Fortunately, most of the time this can be resolved by cleaning the Fine Filter System and Sump in the dishwasher. If that does not resolve the issue, unfortunately service is required.

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E1 error on LG Dishwasher - YouTube

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www.youtube.com/watch?v=2qcwAyHI9ik
Aug 24, 2012 - Uploaded by 62spindrift My fix for E1 error on LF Dishwasher. ... Dishwasher Pump and Motor Assembly Replacement - LG ...

R u sure it is not an (LE) error code. Kinda looks like an upside down (F)? Very common on older LG washers. Indicates a hall sensor/ motor position sensor error.

On LG's, a 1E error message usually means there is a problem with the water inlet valve. Check your shutoff valve under the sink, first, just to make sure someone didn't accidentally turn it off. If it's on, then it's most likely the water inlet valve located under the dishwasher.

This happens to my LG dishwasher every 6 months or so. It also makes a groaning sound as if the system is starved for water. I resolve the problem by removing the dishwasher and laying it over on it's right side. I then remove the two plastic assemblies that are on the left side and I remove them from the dishwasher (you will need a vice grips to remove the hose clamps from behind them, you will also need to remove the round circular water intake plastic disk that is on the inside of your dishwasher on the left hand side right in the middle of the left wall) and clean them. Once the water can run freely through these plastic parts you will get a good water flow and you should be fine. Until you have time to do this I recommend putting a few quarts of hot water into your dishwasher once you start to hear the groaning problem. This solution should be very easy for anyone who is comfortable doing their own oil change. Oh, and turn off the power supply first. I think the origin of the problem might be too much food on the plates and too strong of a dishwasher gel detergent so the food is turned into gunk which coats the channels of the plastic assemblies.

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This happens to my LG dishwasher every 6 months or so. It also makes a groaning sound as if the system is starved for water. The resolve the problem by removing the dishwasher and laying it over on it's right side. I then remove the two plastic assemblies that are on the left side and I remove them from the dishwasher (you will need a vice grips to remove the hose clamps from behind them, you will also need to remove the round circular water intake plastic disk that is on the inside of your dishwasher on the left hand side right in the middle of the left wall) and clean them. Once the water can run freely through these plastic parts you will get a good water flow and you should be fine. Until you have time to do this I recommend putting a few quarts of hot water into your dishwasher once you start to hear the groaning problem. This solution should be very easy for anyone who is comfortable doing their own oil change. Oh, and turn off the power supply first.

1E error is Not reached to the normal water level in spite of 10 min. water supply
POSSIBLE CAUSE REMEDY FOR ERROR OCCURRENCE The Water Supply Tap is closed. The Water Supply is shut off. The Inlet Hose is kinked. The Water Pressure is very low. (below 10 psi) Inlet Valve is OK? The filter of Inlet Valve is clogged by impure water. The Hall sensor is OK? The Impeller of Air Guide is bound.
Remedy Take action on Water Supply device. Measure the electric resistance of Inlet Valve. (950-1300 ) Clean the filter of Inlet Valve. Check the frequency of Inlet Water by the Test Mode. Replace the Air Braker.

Inlet water error 1E
Not reached to the normal water level in spite of 10 min. water supply
The Water Supply Tap is closed. The Water Supply is shut off. The Inlet Hose is kinked. The Water Pressure is very low. (below 10 psi) Inlet Valve is OK? The filter of Inlet Valve is clogged by impure water. The Hall sensor is OK? The Impeller of Air Guide is bound.
Take action on Water Supply device. Measure the electric resistance of Inlet Valve. (950-1300 ) Clean the filter of Inlet Valve. Check the frequency of Inlet Water by the Test Mode. Replace the Air Braker.

I had a LG certified repairman come out and fix. The electrical wires within the door were melted into the "tar" (sound deafening spray) and one wire actualy sheered. Apparently the drying cycle heats the tar and the wires become embeded and melt into the tar. This is what was causing the error code. After the wire was tested and spliced everything worked great. Long term...The door/electrical harness was replaced by LG.

Are you sure it's 1E and not LE error code??  The symptoms you mentioned indicates that it is an LE error code and the motor has an issue.  You will need to call a qualified LG technician to diagnose and resolve the problem.