Coffee Queen TOWER - Error Messages and Troubleshooting; Level Control Errors (E1, E4); Temperature Control Errors (E2, E3); Authorized Technician for Repairs

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12. Error message - SERVICE TOWER
Error message: Display shows: E1, E2, E3, E4.
LEVEL CONTROL
TEMPERATURE CONTROL
Display shows: E1 = Level sensors short electrod is Clean level sensor.
earthed, (GND) Change level sensor.
but not level sensors long electrod. Cables wrongly coupled.
Display shows: E4 = Filling time too long. Restart machine.
Low pressure on water.
Water tap not open.
Display shows: E2 = Temp. sensor out of range 5°C - 105°C.
Temp. sensor failure. Change temp. sensor.
Cable is loose. Connect cable.
Display shows: E3 = Heating time too long. Restart machine.
Solid state defect. Change solid state.
Element defect. Change heating element.
High limit control defect.
IMPORTANT! All maintenance and installations must be done of an
authorized technician.