GE Profile PNSF31Z01 Owner's Manual page 12

About the water softening system.
Feature: Program Memory
Feature/Service: Automatic Electronic Diagnostics
12
If electrical power to the water softening system is interrupted, the
time display is blank, but the timer keeps correct time for about six
hours. When power is restored, you have to reset the present time
only if the display is flashing. All other settings are maintained and
never require resetting unless a change is desired.
If the time is flashing after a long power outage, the water softening
system continues to work as it should to provide you with soft water.
However, regenerations may occur at the wrong time of day
until you reset the timer to the correct time of day.
The timer computer has a self-diagnostic function for the electrical
system (except input power and water meter). The computer
monitors the electronic components and circuits for correct
operation. If a malfunction occurs, an error code appears in the
timer display.
The chart on Error Codes
appear and possible defects for each code. While an error code is
displayed, all timer buttons are inoperable except for the SELECT
button. SELECT remains operational so the service person can make
the Manually Initiated Electronic Diagnostics to further isolate the
defect and check the water meter.
shows the error codes that could