Culligan MARK 100 Service Manual page 9

Display Blanking
As shipped from the factory, the display of the board will turn off if there has been no keypad activity for a 1 minute
period. To have the display constantly lit, press the STATUS button until the number 10 icon is lit. Next, press the
UP arrow. A "d" for disable will appear in the display. To have the display blank again , press the UP arrow. An "E"
will appear in the display .
Display Lockout
The Culligan Mark 100 control is equipped with a new feature which will allow you to protect the programmed
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settings from tampering by unauthorized individuals. When the lockout feature is activated, the only parameter
which can be adjusted is the Time-of-Day.
To activate the lockout feature, press the STATUS button until the number 9 icon is illuminated. A "U" for unlock will
be displayed. Press the UP and DOWN arrows simultaneously. A "L" for lock will appear along with an icon of a lock.
All program parameters, except time of day, are now frozen at their current settings. To disable this feature, press the
UP and DOWN arrows simultaneously.
Power Loss
The AccuSoft circuit board is equipped with a Hi-Cap Capacitor and EEPROM memory chip. The capacitor is
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capable of maintaining the time, for at least one day, in the event of a power outage. The EEPROM ensures that the
individual programming parameters of the softener are not lost.
If the power outage lasts long enough to drain the Hi-Cap Capacitor, the control will flash "12:00 PM" when
power is returned to the control. The unit will continue to keep time from the moment power is restored, and will
initiate a full regeneration at the preset regeneration time. The time of day will need to be reset in order to return
the regeneration to its preset time.
Failure Mode
The Culligan Mark 100 control is equipped to detect a motor or piston which is locked in a frozen position. The
AccuSoft circuit board will apply power to the motor for 30 seconds. If there is no change in the motor homing or
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position switch, the control will power down for 90 seconds. The circuit board will repeat this procedure two more
times in an attempt to remove the obstruction. If no movement has been detected, the control will permanently
power down and a phone icon will appear in the display. The phone indicates that a service call is required to fix the
control. To return to the service mode, turn off the power to the unit for 1 full minute and remove the obstruction to
the motor or piston.
FAMILIARIZATION 7