Burkert Type 8660 - Manual (Page 32)

Type 8660 Control Center
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heater/hour key will blink. This key is used to quit the error message. Pressing the key will clear the
display and stop the blinking of the light-emitting diode, and further operational activity is possible.
The error message will not be saved, and will appear only when the corresponding unit is contacted.
Possible causes:
- Drive power supply interrupted.
- Potentiometer feedback interrupted.
- Motor of the drive is defect.
- Valve is mechanically stuck.
Possible operational activity:
Quit the error message by pressing the Supplementary heater/hour key. A dot on the display will
show that the message has been quitted.
Consequence:
Depending on the temperature set point w, end positions will be assumed
(w < 50%: closed; w > 50%: open).