SES 2000 Vac (LS3) AUTOCLAVE Part 3
ST-SM45g Page 17 of 53
PART 3 MAINTENANCE
FUSES (Fig. 2.4 )
1 The autoclave is protected by five fuses. Two mains supply fuses are fitted on the rear cover of the autoclave
(Fig. 2.4 item 2). Three more fuses are fitted to the solid state relay board (Fig. 2.4. item 14). All fuse ratings are given
in the TECHNICAL DATA section.
FAULT DIAGNOSIS
2 A number of typical faults which could occur, their possible causes and how to remedy them are listed below. For
maintenance procedures refer to Parts Replacement and Adjustment.
Note: Cross references in the ‘Remedy’ column (e.g. para.10) refer to paragraphs in the Parts Replacement and
Adjustment section that follow later in Part 3.
WARNINGS
Switch-off and disconnect mains power supply before removing the autoclave cover, or doing
maintenance procedures. During certain procedures mains voltage may have to be present with the
cover removed and extreme care should be taken to avoid contact with mains voltage.
Check that chamber is at atmospheric pressure before opening the door.
Should the door be opened beware of possible very hot water or steam escaping from the chamber.
Fault Diagnosis Table
Fault Possible Cause Remedy
(1) Nothing happens when power (a) Mains supply failure. (a) Check mains supply, also
switched on (No display). plug and supply cable
for loose connections
or breaks.
(b) Main fuses blown (b) Replace fuse(s)*.
(rear panel).
(c) Faulty power switch. (c) Replace power switch
(para 31).
(d) Solid-state relay board (d) Replace fuse*.
fuse blown or loose.
(e) Transformer failed. (e) Check transformer secondary
voltage (20V a.c. rms).
Replace transformer if
output is zero (para 8).
(f) Short circuit on (f) Check sensor, fill valve, vent
24V circuit. valve etc. for short circuit
Replace where necessary.
(g) Short circuit on solid-state (g) Check SSR board is correctly
relay board. fitted in bottom guide,
with correct clearance from
dividing panel. Also see
Appendix B
*Note: Blown fuses can indicate further problems. Always investigate the reason for any fuse blowing,
but bear in mind that fuses can ‘age’ and blow for no other reason.
Continued
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