Tuttnauer EA - Page 39

20. LOW PRESS MESSAGE IS DISPLAYED
This is usually due to insufficient water inside the chamber.
e If the water valve is OK, the electrode detecting the water level may be damaged. It may
detect water in the chamber although it is actually empty.
e The normal operation procedure of the electrode is to let water in the chamber 8
additional seconds after it has detected a sufficient water level.
If the electrode is short circuited, it may let water into the chamber for ONLY seconds.
e Check if there is any contact between the electrode and the chamber. Use an Ohm- meter
for that purpose. Make sure none of the tools to be sterilized has any contact with the
electrode. If the problem persists, the electrode circuit on the AJUNC3 board may be
short circuited or damaged.
21. CLOCK AND DATE ARE INACCURATE, NEW DATA IS NOT KEPT IN
MEMORY
e If new data (operator’s own parameters ) is not kept in memory, then the backup battery
is down, and the same unit has to be replaced as the backup battery is an integral part of
the Real Time Clock. Change the Real Time Clock (U2), on PREDG.
e The battery manufacturer offers a ten year guarantee, but it is recommended to change
the Real Time Clock including the integrated backup battery once every 8 years.
22. UNPREDICTED FUNCTION OF THE AUTOCLAVE
e Check the input and output voltages. Disconnect the printer as it may be causing a
short circuit if it is faulty. If the problem persists, the keypad may be short
circuited, replace it with the PREDG board, if that does not help, replace the
complete electronic system.
23. DISPLAYING OF LOW TEMPERATURE
If LOW TEMPERATURE is displayed, the following should be checked :
1. The proper amount of water is in the chamber.
The safety thermostat cuts off the heating elements during the sterilization stage.
To raise the working temperature, do one of the following:
Using a plier or a screwdriver, turn the thermostat stem clockwise 1/8 - 1/4”.
Repeat this procedure if necessary.
24. MEMORY RESET
To reset the memory of the autoclave control unit backed up by a battery, proceed as
follows: Be sure that there is no pressure in the autoclave chamber.
Turn the main switch to OFF position.
Press the STOP key. At the same time turn the main switch to ON position.
Keep pressing the STOP key until the program parameters are displayed.
Set the Sterilization temperature, Sterilization time, Date and Time.
Repeat the procedure of automatic water filling - Page 20.