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One of the problems that I see with these units is the Grinder setting. Sometimes the grinder is set too fine for Dark and Oily beans. This setting will ( can) clog up the brew screen after less than 10 cups are brewed. Also, running the cleaning tablets through to create a clean starting point may help you. Try turning the grinder to a slightly coarser setting and try that.
The LE error message means locked motor error and it is almost always accounted for an out-of-order Hall Effect Sensor. Other causes includes defective Main Board and broken wiring harness.
To check the Hall Effect Sensor:
Unplug the machine.
Remove the top plate assembly by unscrewing the two screws on the back of the top plate.
Look for the Main Board assembly on the rear left side of the machine.
Remove the power connector and sensor switch assembly.
Remove the Main Board assembly protection cover by releasing the latches along its sides.
Look for the 4-pin white connector with white, gray , red, and blue wires. It is the wiring harness going to the Hall Effect Sensor. Disconnect it from the board.
Using a multimeter, check the resistance between the white and blue wires and between the white and red wires. Resistance should read about 10k ohms.
If either resistance reads open, check for a broken wiring
harness and repair or replace as necessary. Otherwise, the Hall Effect
Sensor is defective and must be replaced.
If the tests above show that the Hall Effect Sensor seemed to be good, you have
to check if the Main Board delivers 10 to 15 Vdc supply to it.
Reconnect the machine to the power outlet.
Press POWER but DO NOT PRESS START.
Set the multimeter to DC volt and measure the voltage between white and gray wire terminals on the Main Board. Voltage should be 10 to 15 Vdc. Otherwise, the Main Board is defective and must be replaced.
Connect the red test lead to the red wire and the black test lead to the gray wire.
Turn the motor rotor slowly by hand.
You should measure a pulsating 10 Vdc if the Hall Effect Sensor is okay.
Repeat the step with the red test lead connected to the blue wire.
If you measure a 10 Vdc but not pulsating, the Hall Effect Sensor is defective and must be replaced.
Feel free to inform me if the Hall Effect Sensor or the Main Board needs to be replaced and if you want to replace it yourself.