Part 3 SES 2000 AUTOCLAVE
Page 28 of 43 ST-SM8l
PART 3 MAINTENANCE
ERRORS AND ERROR CLEARING
General
3.40 Various situations can give rise to an error code
being displayed. Any error is stored in the internal
memory of the microcomputer. The autoclave is
automatically ‘locked’ out of action until the error has
been cleared. The area of error is stored for service
engineering and indicated briefly by the display of one
of the error codes shown below on entering the
‘Engineering’ mode (section 3.27). This will only be
displayed once as entering the ‘Engineering’ mode
also cancels the message.
Code Meaning
Err 1* Clock fault or Faulty temperature sensor/
channel detected
Err 2 Door open during cycle
Err 3 Chamber did not fill with water (LoH2O)
Err 4 Water loss early in cycle (H2O)
Err 5 No heat
Err 6 Control temperature low
Err 7 Control temperature high
Err 8* Monitor temperature low
Err 9* Monitor temperature high
* Printer version only
Note: These error codes are not displayed during
normal operation (see Part 2, section 2.23).
3.41 Once the fault has been corrected, clear the error
from the microcomputer memory as follows:
a Switch off power to the unit.
b Push and hold in any one of the programme
selector buttons (not switch 5) and switch on
power.
c Release programme selector button after two
seconds.
Control Sensor Selection (Printer version only)
3.42 At any time during normal operation of the
autoclave, when the heater is operating and the
temperature display is showing, pressing switch 5 will
‘switch’ the display to the control sensor and ‘c’ will be
displayed in the far left position for as long as the button
is pressed. This feature enables a check to be made
on the control temperature in relation to the display
temperature.
Autocheck (Printer version only)
3.43 When the sterilizing phase has been reached a
check is automatically made to ensure that the
temperature recorded on each sensor does not exceed
specific limits for the cycle selected. Should this
happen, the appropriate error code from E6 to E9 will
be displayed (see section 3.40).
ROUTINE CALIBRATION PROCEDURE
General
3.44 The autoclave will retain its calibration well over
long periods of time but, occasionally, and when a new
sensor or controller board has been fitted, re-calibration
is necessary. The chamber temperature should be
measured using a ‘needle’ thermocouple connected to
a temperature indicator of known accuracy. In the
factory a chart recorder is used. The thermocouple
should be inserted through the port available in the
manifold at the rear of the chamber (Fig. 4 item 19).
CAUTION
Take care not to damage the internal seals in the
test port fitting. Avoid using a sharp pointed
thermocouple probe, if possible.
3.45 It is recommended that the calibration is checked
at least every twelve months, or more often if the unit is
heavily used or if local codes of practice require it.
3.46 For the purpose of this description it will be
assumed that the autoclave is working correctly and
that a routine temperature calibration is required.
3.47 It is particularly important that the following points
are noted before calibration is attempted:
a There must be no steam leaks.
b The air valve must close between 99 and 104°C.
c The machine should have been run sufficiently to
become thoroughly warm.
Note 1
A machine with suspect calibration should only be run
using the calibration sequence described below. This
should avoid the possibility of the safety valve lifting
due to excess chamber pressure, which might be the
case if the 134°C programme were to be selected.
Note 2
To ensure accurate calibration the cover should be
replaced (not fixed) whenever possible during stages
3.48 'b to e'.
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