W&H Lisa VA131-17 Instructions For Use Manual page 107

Problem
When the sterilizer is connected
to an automated water supply
system: there is no clean water in
the tank, but the automatic water
filling does not fill the water
The sterilizer enters into standby
mode immediately after opening
the chamber door.
At the end of the cycle the display
reads "Open the door" but
opening the door is impossible.
The sterilization process phase of
a sterilization cycle was longer
than expected.
Warning about USB saving (HTML
and SCL files).
Warning about programmed
maintenance.
LISA | Instructions for use | VA131 ENG Rev. 05 | 31/07/2018 | © 2018 W&H Sterilization Srl
Possible cause
Water fill system not connected.
When the water fill system attempted to fill the
tank, water was temporarily unavailable.
Faulty MIN water level sensor in the clean water
tank.
The chamber door has not been opened after the
previous cycle had finished and the standby mode
delay has expired.
The chamber is in vacuum due to an internal
malfunction.
The bacteriological filter is blocked.
The chamber temperature dropped below the
minimum threshold and the software performed a
successful recovery.
The USB pen drive is not connected or not properly
connected to the sterilizer.
A component shall be replaced for the programmed
maintenance of the sterilizer.
Connect the water fill system to the sterilizer. See "Water quality" on page 118.
Since water tank filling is attempted only once in-between cycle execution, this event
inhibits water feeding. Switch the sterilizer OFF and then ON again.
Check the external water supply system.
Check for water leaks from the sterilizer.
Call service.
Press the standby button to exit.
Switch the sterilizer OFF: this releases any internal pressures allowing the chamber door
to be opened. Call technical service if the problem persists.
Remove the bacteriological filter to get the pressure released. Replace the filter.
Note: The bacteriological filters need to be replaced every 400 cycles.
Wait for cycle completion. If the problem occurs frequently, call technical service.
Check presence and connection of the USB pen drive.
If the problem persist, call service.
Call service to order the requested component (door seal, dust filter, bacteriological
filter...).
See "Ordinary maintenance" on page 74
Solutions
Diagnostic
107