SECTION II
TESTING AND TROUBLESHOOTING
© Midmark Corporation 2002 SF-1803 Page 2-23 Printed in U.S.A.
(Continued)
(Non-Coded Errors)
Sterilizer not drying instru-
ments properly.
(Continued)
Instruments are wet after
drying cycle is complete.
Vent Valve malfunction-
ing or related lines or fit-
tings restricted.
•Run Service Diagnostics
and check Vent Valve
Operation. Check for
debris in lines and valve.
•If Vent Valve does not
operate check for line
voltage at terminals of
valve.
•If line voltage is present
but valve does not oper-
ate, disconnect power
from unit.
Disconnect leads from
Vent Valve coil and
check continuity.
115 VAC = 0.4 MOhms
230 VAC = 3.2 MOhms
(cold readings +/- 10 %)
If no continuity replace
valve.
Clean or replace Vent Valve,
related lines and fittings (Refer
to para 4.18).
Heater not functioning. Run Service Diagnostics
and check operation
heater, and various com-
ponents.
Replace malfunctioning heater
or related component(s).
High Limit Switch(es) is
stuck in an “open” posi-
tion.
Disconnect power and
check continuity across
High Limit Switch.
Limits opens at 425°F
(218°C) to 475°F (246°C)
Close at 325°F (163°C)
to 375° F (191° C)
If continuity is not present and
temperature at limit is below
the Limits “Open” temperature
replace Limit Switch (Refer to
para 4.19).
(Non-Coded Errors)
Biological indicator strip
designates unit not steril-
izing.
Positive biological indica-
tor.
No color change, or incom-
plete change has occurred
on chemical indicator strip.
Sterilizer overloaded Check that pressure ves-
sel is not overloaded with
heavy linen packs.
Remove packs, allow unit to
cool and run a cycle. Instruct
operator to reduce load size.
Improper operation. Procedures used by
operator(s).
Demonstrate Normal Opera-
tion to operator(s).
Using trays for instru-
ments not manufacture-
red for sterilizer. Does
not get proper air flow or
steam penetration.
Check style of instrument
trays being used.
Explain to operator(s) to use
only trays manufactured for
use in M9 / M11 Sterilizer.
Wrong type of biological
indicator being used for
this type sterilizer.
Check biological indica-
tor to assure it is for grav-
ity type sterilizers and
correct for the cycle
times and temperatures
being run.
Contact supplier of biological
indicator to acquire correct
indicators. Review Installation
/ Operation Manual for correct
procedures.
Chemical indicator strip
has come into contact
with water in the steril-
izer.
Check with operator on
positioning of indicator
strip in sterilizer.
Explain to operator correct
positioning to prevent direct
contact with water.
Indicator strips are being
stored in damp and / or
hot environment.
Check condition of area
where indicators are
stored.
Inform operator to follow stor-
age recommendation of indi-
cator manufacturer.
Table 2-3. Troubleshooting Guide
Problem Display / Symptom Probable Cause Check Correction
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