Page 72 of 101 pages
Symptoms
Possible causes check-
ups and tests
Corrections
3. Steam pressure goes
beyond the control
point.
3.1
Pressure switch faulty or
incorrectly set.
3.1
Check, repair or
replace the pressure
switch.
3.2
Contacts at contactor
welded because of short
circuit.
3.2
Check the cause,
replace the damaged
contactor.
4.The conditioning
phase (pre-vacuum
does not work).
4.1
Check if the trouble is
due to pump or its
electrical supply circuit.
4.1 See solutions indicated
in par. 2.
4.2 The vacuum valve
passing water through the
vacuum pump stuck or
damaged.
4.2 Check, repair or
replace the water to
pump valve.
4.3
The exhaust to pump
valve stuck or damaged.
4.3
Check repair or
replace the fast
exhaust valve.
4.4
Door improperly closed,
gasket damaged or
incorrectly seated on the
groove.
4.4
Close the door, fix or
replace the gasket.
4.5
Leakage at the vacuum
or exhaust piping.
4.5
Check and tighten
fitting joints, replace
defective packing.
4.6
Steam inlet valve blocked
or damaged.
4.6
Fix or replace the
steam valve.
No steam inlet or low
steam pressure.
4.7
Low pressure at the
steam supply line.
4.7
Check the steam
generator as shown in
par. 2.
4.8
Control system trouble.
4.8
Replace the control
boards.
5. Pre-vacuum phase
completed but
temperature and
pressure are low and
the sterilization point is
not reached or takes a
long time to reach it.
5.1
5.2
Low pressure at the
steam supply line.
Steam inlet valve clogged
or damaged.
5.1
5.2
Check steam
generator, fix pressure.
Check and fix or
replace the steam
valve.
5.3
Electronic
pressure
transducers or measuring
circuits faulty or set too
low.
5.3
Set correctly or replace
boards.
5.4
Control system trouble.
5.4
Replace the control
boards.
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