W&H MN-111 Operating instructions

MN-111 110 V / 220 V
SERVICE BOOK
ENG - Rev08
Errors and Troubleshooting

ii MN-111| Service book |Errors and Troubleshooting MN-111 ENG Rev08 |2019/06/21 |© 2019 W&H Sterilization Srl
Product service literature
WHERE TO FIND TOPICS
Topic Service book or other source
Accessories Repair and Spare Parts
Adjusting the 24V power output Repair and Spare Parts
Assembling and disassembling instructions Repair and Spare Parts
Authorized Service Partners Instructions for use
Calibration Instructions for use of the Sterilizer Calibration Device
Cycle descriptions and phases Product description and operation
Diagnostic cycles Test instructions
Diagnostics and fault finding Errors and Troubleshooting
Displaying the functional parameters INFO screen Instructions for use - Test instructions
Electric diagram Product description and operation
Electrical component testing Test instructions
Error list Errors and Troubleshooting
Hydraulic diagram Product description and operation
Importers and local Partners Instructions for use (inside the back cover)
Installation Instructions Instructions for use
Installation of upgrading and retrofitting kits Repair and Spare Parts
Installation requirements Instructions for use
Level switch testing Test instructions
Loop cycle Test instructions
Maintenance program table Instructions for use - Repair and Spare Parts
Manufacturer reference contacts All
Message list Instructions for use
Operational states of components Product description and operation
Passwords and special codes Repair and Spare Parts
Pressure sensor testing Test instructions
Repair and spare parts instructions Repair and Spare Parts
Replacement of consumables Instructions for use
Replacing the backup battery of the main board Repair and Spare Parts
Requirements for the supply water Instructions for use - Product description and operation
Retrofitting and upgrading kits Repair and Spare Parts
Safety thermostat testing Test instructions
Saturated steam: pressure - temperature correlation table Test instructions
Service kits Repair and Spare Parts
Software menu (Service) Product description and operation
Software menu (User) Instructions for use
Software update Repair and Spare Parts
Software version installed Repair and Spare Parts
Spare part list Repair and Spare Parts
Technical data Instructions for use - Product description and operation
Test cycles Instructions for use - Test instructions
Time duration of cycles and Phases Test instructions
Tool list Repair and Spare Parts
Torque values for bolts and nuts Repair and Spare Parts
Water consumption table Test instructions

Table of contents
MN-111| Service book |Errors and Troubleshooting MN-111 ENG Rev08 |2019/06/21 |© 2019 W&H Sterilization Srl iii
About this manual 4
Conformity 5
Symbols and messages 6
Safety warnings 8
Emergency door opening 9
Errors 10
Checks and actions 10
Other problems 18
Water tank problems 18
Water spillage problems 18
Printer problems 18
USB device problems 19
Display problems 19
Other problems and malfunctions 19

4 MN-111| Service book |Errors and Troubleshooting MN-111 ENG Rev08 |2019/06/21 |© 2019 W&H Sterilization Srl
About this manual
MANUAL CONTENT
This manual contains the Instructions for use and for maintenance of the following sterilizer versions:
nMN-111 100–125 V ac
nMN-111 200–240 V ac
nMN-111 Med 100–125 V ac
nMN-111 Med 200–240 V ac
Versions differ for nominal voltage, maximum current, chamber material (AISI304 or 316) and some functionality between W&H
and W&H Med versions.
DISCLAIMER
All pictures, graphics and illustrations provided in this manual are for the comprehension of the text. They are not meant to be an
accurate representation of product details. Thus, they should be taken as indicative only, and may differ from the actual product.
For any suggestions or remarks please send an email to office.steriliza[email protected]m.
COPYRIGHT NOTICE
Copyright © 2019, W&H Sterilization Srl
All rights reserved in all countries.
All drawings, images and texts contained in this manual are the property of the manufacturer. Even partial duplication of drawings,
images or text is prohibited.
The information contained in this document is subject to change without prior notice.

Conformity
CONFORMITY TO EUROPEAN AND AMERICAN STANDARDS AND DIRECTIVES
STERILIZER featuring sterilization cycles conform with the following standards:
Standards and
Directives Description
93/42/EEC
Medical Device Directive (MDD).
Medical Device Directive 93/42/EEC for devices class IIb, in accordance with the Rule 15 – ANNEX IX of the above Directive.
2014/68/EU
Pressure Equipment Directive (PED).
Directive 2014/68/EU (PED – Pressure Equipment Directive) for every sterilization chamber designed and manufactured in conformity to the ANNEX 1 and to
the procedure described in the module D1 Annex III.
2012/19/EU Waste Electrical and Electronic Equipment (WEEE).
CSA C22.2 No.
61010-1-12
Safety requirements for electrical equipment for measurement, control and laboratory use, general requirements.
UL 61010-1:2012 Safety requirements for electrical equipment for measurement, control and laboratory use, general requirements.
ASME Boiler and pressure vessel code.
EN 13060 Small steam sterilizers.
ANSI/AAMI
ST55:2010
Table-top steam sterilizers.
IEC 61010-1 Safety requirements for electrical equipment for measurement, control and laboratory use, general requirements.
IEC 61010-2-040 Safety requirements for electrical equipment for measurement, control and laboratory use; particular requirements for sterilizers and washer-disinfectors
used to treat medical materials.
IEC 61326-1 Electrical equipment for measurement, control and laboratory use - EMC requirements; general requirements.
IEC 61770 Electric appliances connected to the water mains - Avoidance of backsiphonage and failure of hose-sets.
Note: Every new sterilizer is delivered with a Declaration of Conformity and a Warranty Card.
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Symbols and messages
SAFETY SYMBOLS USED IN THIS MANUAL
WARNING: Indicates a hazardous situation that, if not avoided,
could result in death or serious injury.
Related to a sterilizer, these warnings indicate hazardous
situations that could result in non-sterile conditions (e.g. non-
sterile instruments) which could lead to fatal personal injury.
CAUTION: Indicates a hazardous situation that, if not avoided,
could result in minor or moderate injury.
Live parts. Risk of electrical shock Hot surfaces. Risk of burns.
SYMBOLS USED IN THIS MANUAL
Mounted with magnets OR
magnetic components present
Components sensitive to
electrostatic discharges.
ATTENTION!
Don’t use any glue.
ATTENTION! Do not use any
lubricant. Use water instead.
ATTENTION!
Moisten with water only.
Keyhole mounting.
No need to remove the
screws.
General explanations, without
risk to persons or objects.
Call service.
SYMBOLS DISPLAYED ON THE PRODUCT
Hot surfaces!
Risk of burns.
Hot steam!
Risk of burns.
Consult the Instructions
for use for important
cautionary information.
Consult the Instructions
for use.
Do not dispose of with
normal waste
PROPERTY DAMAGE MESSAGES
Notice: Indicates information considered important, but not hazard-related. Typically to avoid damage to the product.

Symbols and messages
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LABEL ON THE BOX

8 MN-111| Service book |Errors and Troubleshooting MN-111 ENG Rev08 |2019/06/21 |© 2019 W&H Sterilization Srl
Safety warnings
GENERAL WARNINGS
nBefore performing any repairing or service interventions on the sterilizer, ALWAYS DISCONNECT the electric power
supply cable to avoid injury.
nIf for any reason you are unable to remove the power supply or if you have to walk away from the unit, always
place a “WORK IN PROGRESS” sign, to warn other people that might walk up to the sterilizer.
nService should be performed by qualified technicians only.
nObserve all local and national directives related to service and safety standards.
nAlways use personal safety devices (e.g. glasses, gloves, protection mask, etc.).
nBefore making any repairs or transport, ward off unauthorized personnel from the working area.
nRefer also to all the safety indications given in the Instructions for use of the product.
TRANSPORT
Spare parts shall be handled with care.
In case of transport of the sterilizers:
nCompletely drain both water tanks;
nDrain the condenser bottle;
nAllow the sterilization chamber to cool down;
nUse original or appropriate packaging;
nPut the box of the sterilizer on a desk
nRemove the upper part of the box;
nPosition the sterilizer in the dedicated area of the box;
nCarefully seal the box;
nThe transport of the sterilizer shall be done by two authorized technicians using PPE devices (personal protective
equipment) according to applicable standards;
nThe sterilizer shall be handled with care.

Emergency door opening
WARNING ABOUT OPENING THE DOOR IN EMERGENCY
WARNING! High pressure. Risk of explosion, jet of hot steam, sudden opening of the door. Carry out the following procedure
only if necessary and only when NO RESIDUAL PRESSURE IS IN THE CHAMBER. Any attempt to open the door while the unit is
still hot or under pressure could expose the operator and the surrounding personnel to serious risk.
CAUTION! High temperature. Risk of burns. Carry out the following procedure only when the sterilizer has completely cooled
down. The sterilizer should be unplugged from the mains power supply since 3 hours at least.
Notice: Carry out this procedure only as indicated and with the sterilizer in the indicated conditions. Any attempt to open the door
in a different way can seriously damage the sterilizer.
OPEN THE DOOR IN EMERGENCY
1Unplug the sterilizer and wait at least three hours.
2Remove the power connection (back side)
3Release the chamber pressure through the ring of the safety
valve (sterilizer rear side) or wait three hours until the
pressure has been naturally decreased to the environment
pressure.
4Extract the door opening tool placed behind the service door
5Remove the cap
6Insert the opening tool into the hole and then turn it
counterclockwise until the door is unlocked (proceed slowly
until it stops).
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Errors
CHECKS AND ACTIONS
Notice: For any error not listed in this table, call technical service.
Code Description Possible causes Checks and actions
010 Mains voltage or 24V error during
the cycle.
Power cord failure or
disconnected.
Check the power cord is properly plugged. Check the power cord for electriccontinuity.
Sterilizer switched OFF during a
cycle.
Wait until the error phase on the screen is finished.
Electric failure in the building
system.
Connect the sterilizer to a dedicated circuit as reported in the user instruction.
Check the electric power in the building.
Check the electric power at the wall plug.
24 V power unit failure. Check the 24 V power unit (see Test instructions service book).
011 Software error during update. Software update failure. Repeat the update.
If the failure persist, call service.
020 to 049 Internal voltage out of range. Sensor failure.
Main board failure.
Disconnect progressively all sensor cables from the main board. Check the ERRORS
screen:
nIf the error persists, replace the main board.
nIf the error disappears, replace the sensor/cable that causes the error.
050 - 051 Mains voltage out of range. Mains voltage out of range.
Main board failure.
Check the System Info screen.
The mains voltage of the 230V sterilizer version must be between 180 and 264 volts and
must be stable.
The mains voltage of the 110V sterilizer version must be between 90 and 132 volts and
must be stable.
If the mains voltage is bad (out of range or unstable), check the mains supply voltage
with a multimeter and compare it with the reading of the System Info screen.
If the values are different, replace the main board, otherwise check the electric supply.
053 Current consumption of the
sterilizer out of the range.
Electric 230 V-110V supplied
component failure (short-
circuited or out of range).
Main board failure.
In the Component Activation menu, check the resistance of all the supplied components
(heaters, vacuum pump, water pump).
Compare the values shown by the sterilizer with those measured with a multimeter.
nIf the values are different and those given by the multimeter are in the range while
those given by the sterilizer are out of range, replace the main board.
nIf all values are the same and a component gives an out-of-range value, replace
the component.
054 to 059 Main board: internal voltage error. Main board failure. Replace the main board.
060 Low voltage on 24 VDC circuit. Failure of a 24 V-supplied
component or in its connection
cable to the main board.
Disconnect progressively all components from the main board. Check the ERRORS
screen:
nIf the error disappears, replace the component/cable that causes the error.
nIf the error persists, see next step.
Failure of the 24 V supply unit. Check the 24 V power unit (see Test instructions service book).
061 Too high voltage on 24 VDC circuit. Failure of the 24 V supply unit. Check the 24 V power unit (see Test instructions service book).
070 24 VDC overcurrent. 24 V component failure. If the error is permanent disconnect progressively all 24V components/sensors cables
from the main board.
Check the ERRORS screen:
nIf the error disappears, replace the component/cable/sensor that causes the error.
nIf the error persists, replace the main board.
Sensor failure. If the error is not permanent:
If the problem persist see next step.
Door locking motor failure. See Test instructions service book, chapter SPECIFICTESTFORINDIVIDUALCOMPONENTS,
Door locking system - automaticmode, Door locking system - manual mode.
080 - 082 Main board temperature too high. Main board failure. With a hand-held thermometer, check the temperature in the main board area.
If the values are different from those measured by the sterilizer (check the System Info
screen), replace the main board.
Room temperature too high.
Condenser/Dust filter/Fan grid
clogged/dirty.
Clean the component with compressed air.

Errors
MN-111| Service book |Errors and Troubleshooting MN-111 ENG Rev08 |2019/06/21 |© 2019 W&H Sterilization Srl 11
Code Description Possible causes Checks and actions
082 Main board temperature too low. Main board failure. With a hand-held thermometer, check the temperature in the main board area.
If the values are as low as those measured by the sterilizer (see the System Info
screen), replace the main board.
Room temperature too low or
storage temperature too low
before start-up.
Install the sterilizer as specified.
Let the sterilizer warm up before installation and start-up.
081 - 083 Main board temperature too low. Main board failure. With a hand-held thermometer, check the temperature in the main board area.
If the values are as low as those measured by the sterilizer (check the System Info
screen), replace the main board.
Room temperature too low or
storage temperature too low
before start-up.
Install the sterilizer as specified.
Let the sterilizer warm up before installation and start-up.
084 Voltage frequency out of range. Mains frequency out of
specifications
Main board failure
Check the mains frequency with a suitable instrument.
The frequency must be between 45 and 67 Hz: If no:
ncheck the mains supply and/or contact the electricCompany.
nreplace the main board.
087 to 099 Internal board error or sensor
error.
Sensor failure.
Main board failure.
Disconnect progressively all sensor cables from the main board.
Every time you disconnect a sensor, check the ERRORS screen:
nIf the error disappears, replace the cable/sensor that causes the error.
nIf the error persists, replace the main board
100 Timeout of the pressure phase
HEA3 (30’)
Steam leak from the door seal. Check the door seal and the chamber face side for damage or dirt. Clean and replace
door seal, if needed. Run a sterilization cycle. If the problem persist, see next step.
Water pump failure.
Check/priming ULKA valve failure.
See Test instructions service book, chapter SPECIFICTESTSFORINDIVIDUAL
COMPONENTS, Water pump.
Failure of the clean water MIN
level sensor.
See Test instructions service book, chapter SPECIFICTESTSFORINDIVIDUAL
COMPONENTS, Water level sensors.
Water quality failure. Drain both water tanks. Use water of good quality. Please refer to the Instructions for
use.
See Instruction for use, chapter TECHNICALDATA, Water quality.
S.G. temperature sensor failure. See Test instructions service book, chapter
SPECIFICTESTSFORINDIVIDUALCOMPONENTS, Steam generator temperature sensor.
If it is necessary, replace the sensor.
Failure in the steam generator
heating element.
Run the diagnostic cycle S. G. Perform. Test.
If bad, replace the steam generator.
Failure on a solenoid valve EV1
Failure on a solenoid valve EV5
Run the diagnostic cycle EVX test.
If one valve is detected as faulty, replace it.
EV5/EV1 tube line clogged/dirty Check the tube line conditions.
Replace the components if necessary.
Pressure transducer failure See Test instructions service book, chapter SPECIFICTESTSFORINDIVIDUAL
COMPONENTS.
Replace the sensor if needed.
Multiple failure: solenoid valve
EV3 and check valve V1
Run the diagnostic cycle EVX test.
If one valve is detected as faulty, replace it.
Check the V1 conditions, replace if necessary.
Other steam leak (e.g. chamber). Run a WRAPPED/POUCHED 270°C cycle with maximum load and check for leaks during the
pressure and process phases. The check should be done visually (water drops, steam
sprays). Fix any detected leak.
101 Timeout of the pressure phase
HEA1 (10’)
See error "100" above, all causes.
120-121 Unexpected pressure reading or
pressure reading error during
door opening.
Pressure sensor failure.
Main board failure.
Depressurize the chamber artificially (activate the chamber safety valve manually).
If the problem persist, see error "087 to 099" above and perform the relevant test.

12 MN-111| Service book |Errors and Troubleshooting MN-111 ENG Rev08 |2019/06/21 |© 2019 W&H Sterilization Srl
Errors
Code Description Possible causes Checks and actions
130 Theoretical temperature too high. Chamber temperature sensor
mispositioned.
Check and restore the position of the temperature sensor.
Use the dedicated tool F190100X.
Pressure sensor failure. See Test instructions service book, chapter SPECIFICTESTSFORINDIVIDUAL
COMPONENTS.
Replace the sensor if needed.
Chamber temperature sensor
failure.
See Test instructions service book, chapter SPECIFICTESTSFORINDIVIDUAL
COMPONENTS, Chamber temperature sensors.
If the sensor is broken, replace it.
If the error persists, replace the main board.
Steam generator sensor failure. See Test instructions service book, chapter SPECIFICTESTSFORINDIVIDUAL
COMPONENTS, Steam generator temperature sensor (TABLE POINT 1 and 3).
If it is necessary, replace the sensor.
If the problem persists, see next step.
Main board failure See Test instructions service book, chapter SPECIFICTESTSFORINDIVIDUAL
COMPONENTS, Steam generator temperature sensor (TABLE POINT 1 and 2).
If it is necessary, replace the main board.
131 During PR phase the difference
between theoretical and chamber
temperature > 2°C.
See error "130" above, all causes.
132 At the end of HEA2 phase the
difference between theoretical
and chamber temperature >
0,8°C.
(if Tchamaber>Ttheo no error
shown).
See error "130" above, all causes.
133 At the end of HEA3 phase the
difference between theoretical
and chamber temperature >
0,8°C.
(if Tchamaber>Ttheo no error
shown).
See error "130" above, all causes.
140 Theoretical temperature too low Steam leak. See error "100" on the previous page.
150 Chamber temperature too low
160 Chamber temperature too high See error "130" above, all causes.
161 Chamber temperature too high.
163 Chamber pressure too high. Pressure sensor failure. See error "130" above, same cause.
164 Safety block during PHE phase.
(Pchamber > 1.4 barA)
EV1 failure
V2 clogged/failure
F1 clogged/failure
All the 3 internal chamber filters
clogged/failure
EV5/EV1 tube line clogged/dirty
Check and clean the chamber filters.
Check the components conditions.
Replace the components if necessary.
Steam generator sensor failure. See Test instructions service book, chapter SPECIFICTESTSFORINDIVIDUAL
COMPONENTS, Steam generator temperature sensor (TABLE POINT 1 and 3).
If it is necessary, replace the sensor.
If the problem persists, see next step.
Main board failure See Test instructions service book, chapter SPECIFICTESTSFORINDIVIDUAL
COMPONENTS, Steam generator temperature sensor (TABLE POINT 1 and 2).
If it is necessary, replace the main board.
Pressure sensor failure See Test instructions service book, chapter SPECIFICTESTSFORINDIVIDUAL
COMPONENTS.
Replace the sensor if needed.
166 Safety block during HEA2 phase.
(Pchamber > 1.9 barA)
See error "164" above, all causes.

Errors
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Code Description Possible causes Checks and actions
181 No temperature decrease at the
beginning of the DRYING phase (in
the first 90”).
Solenoid valve EV1
failure/clogged.
V2 one way valve clogged
Check the components conditions.
Replace the components if necessary.
F1 filter clogged
Chamber filters clogged or dirty.
Check and clean the filters.
Replace the components if necessary.
182 No pressure decrease during the
DRYING phase (if after 10’
Pchamber ≥ Penviroment).
See error "Errors" on page10, all causes and the following.
Door gasket failure
V2 clogged/dirty
Check the components conditions.
Replace the components if necessary.
F1 filter clogged/dirty
All three chamber filters
clogged/dirty
Check and clean the filters.
Replace the components if necessary.
Pressure sensor failure See Test instructions service book, chapter SPECIFICTESTSFORINDIVIDUAL
COMPONENTS.
Replace the sensor if needed.
183 At the end of the drying phase,
Pchamber > 0.3 bar.
Solenoid valve EV5 failure.
Solenoid valve EV1 failure.
Check the components conditions.
Replace the components if necessary.
205 Chamber heater error (R2 too
low)
Main board failure See Test instructions service book, chapter SPECIFICTESTSFORINDIVIDUAL
COMPONENTS, Chamber heating element and safety thermostat (TABLE POINT 2).
Chamber heating failure See Test instructions service book, chapter SPECIFICTESTSFORINDIVIDUAL
COMPONENTS, Chamber heating element and safety thermostat (TABLE POINT 3).
See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Chamber heating element and safety thermostat (TABLE POINT 4).
206 Chamber heater error (R2 too
high).
Chamber heater thermostat
operated.
See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Chamber heating element and safety thermostat (TABLE POINT 1).
Chamber heater not connected. Check the connections and the wires between the heater and the main board. If the error
persists, see next step.
Others. See error "205" above.
207 Chamber heater error (R1 too high). See error "206" above, but all tests and actions apply to R1.
208 Chamber heater error (R1 too low). See error "205" above, but all tests and actions apply to R1.
210 Chamber pressure sensor error
or disconnected.
Pressure sensor disconnected. Check the pressure sensor connections and cables.
Pressure sensor failure. See error "130" on the previous page, same cause.
Main board failure. See error "130" on the previous page, same cause.
211 Chamber pressure sensor error. Pressure sensor failure See error "130" on the previous page, same cause.
214 Chamber temperature sensor
error.
Chamber temperature sensor
failure.
See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Chamber temperature sensors (TABLE POINT 1 and 2).
If it necessary replace the chamber temperature sensor.
If the problem persists, see next step.
Main board failure. See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Chamber temperature sensors (TABLE POINT 1 and 3).
If it is necessary, replace the main board.
215 Chamber temperature sensor
error or disconnected.
Chamber temperature sensor
disconnected.
Check the connection to the board and the relevant wires.
Chamber temperature sensor
failure.
Main board failure.
See error "214" above, same causes.
216 Chamber heater sensor error. Chamber heater sensor failure See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Chamber heater temperature sensor (TABLE POINT 1 and 3)..
If it is necessary, replace the chamber heater sensor.
If the problem persists, see next step.
Main board failure. See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Chamber heater temperature sensor (TABLE POINT 1 and 2).
If it is necessary, replace the main board.

14 MN-111| Service book |Errors and Troubleshooting MN-111 ENG Rev08 |2019/06/21 |© 2019 W&H Sterilization Srl
Errors
Code Description Possible causes Checks and actions
217 Chamber heater sensor error or
disconnected.
Chamber heater sensor
disconnected.
Check the connection to the main board and the relevant wires.
If the error persists, see next step.
Chamber heater sensor failure.
Main board failure.
See error "216" on the previous page, same causes.
230 Steam generator temperature
sensor error
Steam generator sensor failure See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Steam generator temperature sensor (TABLE POINT 1 and 3).
If it is necessary, replace the sensor.
If the problem persists, see next step.
Main board failure See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Steam generator temperature sensor (TABLE POINT 1 and 2).
If it is necessary, replace the main board.
231 Steam generator temperature
sensor error or disconnected
Steam generator sensor
disconnected
Check the connection to the board and the relevant wires.
If the error persists, see next step.
Steam generator sensor failure
Main board failure
See error "230" above, same causes.
240 Steam generator heating element
error.
Heating element thermostat
operated.
Reset the chamber heater thermostat.
Check the thermostat continuity (0Ω).
If it is open, replace the component.
Heating element not properly
connected.
Check the connections and the wires between the heating element and the main board. If
the error persists, see next step.
Main board failure. See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Heating element of the steam generator and safety thermostat (TABLE
POINT 2).
If it is necessary, replace the main board.
Heating element failure. See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Heating element of the steam generator and safety thermostat (TABLE
POINT 3).
If the problem persists, see next step.
See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Heating element of the steam generator and safety thermostat (TABLE
POINT 4).
If it is necessary, replace the steam generator.
241 Steam generator heating element
error (coil L1).
Heating element failure.
Main board failure.
See error "240" above, same causes.
242 Steam generator heating element error or disconnected (coil L2). See error "240" above, but all tests and actions apply to L2.
243 Steam generator heating element error (coil L2). See error "240" above, but all tests and actions apply to L2
243 Steam generator heating element
error (coil L2).
See error "240" above, but all tests and actions apply to L2
300 Timeout in LEV phase
(Pchamber<Penviroment-0.10
bar)
Levelling set points not achieved.
HEPA filter clogged/dirty.
EV3 clogged/dirty
HEPA filter tube line clogged/dirty.
F2 filter clogged/dirty
"Emergency door opening" on page9
Check if the sterilizer is installed in accordance to the technical specification reported in
the Instructions for use.
Replace component if needed and/or fix the problem.

Errors
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Code Description Possible causes Checks and actions
340 During HEA2 phase
Pchamber<Penviroment-0.10 bar.
EV1 Solenoid valve failure. Replace component if needed and/or fix the problem.
Main board failure. See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Heating element of the steam generator and safety thermostat (TABLE
POINT 2).
If it is necessary, replace the main board.
Water pump failure See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Water pump.
Replace the water pump if needed.
Check/priming ULKA valve failure See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Water pump. Replace the ULKA valve if needed.
S.G. temperature sensor failure See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Steam generator temperature sensor.
Replace the sensor if needed.
Failure in the S.G. heating element See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Heating element of the steam generator and safety thermostat (TABLE
POINT 3, if problem persists, see TABLE POINT 4).
If it is necessary, replace the steam generator.
EV5 solenoid valve failure Run the diagnostic cycle EVX test.
If one valve is detected as faulty, replace it.
Pressure transducer failure. See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS.
Replace the sensor if needed.
422 H20 overconsumption during
HEA3 phase (starting from the
beginning of the cycle
H20>1200cc).
Door gasket failure. Check and replace the door gasket if needed.
water pump failure. See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Water pump.
Replace the water pump if needed.
Check/priming ULKA valve failure. See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Water pump. Replace the ULKA valve if needed.
Failure of the clean water MIN
level sensor.
See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Water level sensors. Replace the sensor if needed.
S.G. tempearture sensor failure See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Steam generator temperature sensor.
Replace the sensor if needed.
Steam generator failure. Run the diagnostic cycle S. G. Perform. Test.
If necessary, replace the steam generator.
Solenoid valve EV5 failure. Check the components conditions.
Replace the components if necessary.
Solenoid valve EV1 failure. Check the components conditions.
Replace the components if necessary.
EV5/EV1 tube line clogged/dirty Check the tube line conditions.
Replace the components if necessary.
Pressure transducer failure. See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS.
Replace the sensor if needed.
Multiple failure: solenoid valve
EV3 and check valve V1.
Check the components conditions.
Replace the components if necessary.
Leakage (e.g. chamber) Run a 270°F sterilization cycle with maximum load and check for leaks during the
pressure and process phases. The check should be done visually (water drops, steam
sprays). Fix any detected leak.
423 H20 overconsumption during
HEA1 phase (starting from the
beginning of the cycle
H20>300cc).
See error "422" above, all causes.

16 MN-111| Service book |Errors and Troubleshooting MN-111 ENG Rev08 |2019/06/21 |© 2019 W&H Sterilization Srl
Errors
Code Description Possible causes Checks and actions
424 H20 overconsumption during
HEA2 phase (starting from the
beginning of the
cycleH20>600cc).
Water pump failure See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Water pump. Replace the water pump if needed.
Check/priming ULKA valve failure. See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Water pump. Replace the ULKA valve if needed.
Failure of the clean water MIN
level sensor.
See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Water level sensors. Replace the sensor if needed.
S.G. temperature sensor failure See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS, Steam generator temperature sensor.
Replace the sensor if needed.
Main board failure See Test instructions service book, chapter SPECIFIC TESTS FOR INDIVIDUAL
COMPONENTS:
nWater pump (step 3), or
nHeating element of the steam generator and safety thermostat (step 2), or
nSteam generator temperature sensor (steps 2, 5 and 6).
Replace the main board if needed.
430 Fan error. Fan disconnected. Check the connection to the board and the relevant wires.
Fan blade jammed. See Test instructions service book, chapter DIAGNOSTICCYCLE/LEAKAGETESTING (2),
Diagnostic cycle: fan tests (step 2).
Fan motor failure. Run diagnostic cycle Fan Test.
Follow the instructions given on MN-111’s screen. Replace component if needed.
Main board failure. If the problem persists, replace the main board.
520 Door locking timeout. Microswitch disconnected
(LOCKED position).
Check the connections between the microswitch (LOCKED position) and the main board
and the relevant wires. If the problem persist, see next step.
Microswitch failure (LOCKED
position).
Main board failure.
See Test instructions service book, chapter SPECIFICTESTFORINDIVIDUALCOMPONENTS,
Door locking system - automaticmode, Door locking system - manual mode.
Replace the microswitch if needed.
If the problem persists, check the continuity of the cables from the microswitch to the
main board.
If the problem persists, replace the main board.
521 No current through the door
locking motor.
Motor disconnected. Check the connections between the motor, the pressure switch and the main board.
Main board failure
(current detection or motor
supply).
See Test instructions service book, chapter SPECIFICTESTFORINDIVIDUALCOMPONENTS,
Door locking system - automaticmode, Door locking system - manual mode.
If the motor rotates, but the problem persists replace the main board. Otherwise see
next step.
Cable failure. Check the integrity of the relevant wires. If needed replace cables.
Motor failure. See Test instructions service book, chapter SPECIFICTESTFORINDIVIDUALCOMPONENTS,
Door locking system - automaticmode, Door locking system - manual mode.
522 Door locking motor: too high
current at start (during door
closure)
Motor failure.
Main board failure.
See Test instructions service book, chapter SPECIFICTESTFORINDIVIDUALCOMPONENTS,
Door locking system - automaticmode, Door locking system - manual mode.
526 Unexpected position of the
microswitch (the door is locked
and the switch changes status)
Microswitch failure
Main board failure
Replace the door locking system, if the problem persists replace the main board.
Execution of the «Emergency»
manual door opening procedure.
See "Emergency door opening" on page9.
527 - 531 Impossible position detected. Microswitch failure.
Main board failure.
See Test instructions service book, chapter SPECIFICTESTFORINDIVIDUALCOMPONENTS,
Door locking system - automaticmode, Door locking system - manual mode.
529 Unexpected pressure during door
opening.
Pressure sensor failure. See error "120-121" on page11.
532 Door locking motor: too high
current at start (during door
opening)
Motor failure.
Main board failure.
See error "522" above.
533 Door unlocking timeout. Wrong microswitch connection
(OPEN side).
Microswitch failure (OPEN side).
Main board failure.
Proceed as per errors "527 - 531" above, but only with the OPEN side microswitch.
534 Impossible position detected. See error "Errors" on page10.

Errors
MN-111| Service book |Errors and Troubleshooting MN-111 ENG Rev08 |2019/06/21 |© 2019 W&H Sterilization Srl 17
Code Description Possible causes Checks and actions
535 Door locking: motor: current
consumption error (during door
opening)
Motor failure.
Main board failure.
Replace the door locking system, if the problem persists replace the main board.
591 Software error. Software error.
Main board failure.
Upgrade the software to the latest version, if the problem persists replace the main
board.
If the problem persists, call service.
950 to 955 Software chunk size error. Software corruption.
Main board failure.
990 Manual stop. Cycle interrupted manually by the user.
995 to 999 Software error. Software corruption.
Main board failure.
Upgrade the software to the latest version, if the problem persists replace the main
board.
If the problem persists, call service.

18 MN-111| Service book |Errors and Troubleshooting MN-111 ENG Rev08 |2019/06/21 |© 2019 W&H Sterilization Srl
Other problems
WATER TANK PROBLEMS
Description Possible causes Checks and actions
Overflow of the clean water tank during filling (no
acoustic signal)
Upper clean water tank level sensor faulty Check the sensor placement (must be horizontal).
Check the floating part moves freely.
Check the sensor connections and wiring.
Check electrical operation of the sensor. (*)
Overflow of the used water tank Used water tank level sensor faulty Check the sensor placement (must be horizontal).
Check the floating part moves freely.
Check the sensor connections and wiring.
Check electrical operation of the sensor. (*)
Water on the top lid or from the top cap, no warning
on screen)
The "Drain used water tank." message is displayed,
in spite the tank is empty.
Used water tank drains slow or not at all Clogged tank outlet filter or clogged drain tube Clean the used water tank outlet filter.
Check the tubes from the used water tank outlet to the drain
connection; clear or replace any clogged tubes.
Recommend the user to properly clean the load prior to sterilization.
Note: If the sterilizer is not used for over a week, both tanks must be
emptied to avoid algae growth.
No water filling from the automatic system Low-level clean water sensor faulty Check for proper sensor placement.
Check the floating part moves freely.
Check the sensor connections and wiring.
Check electrical operation of the sensor. (*)
Water filling valve faulty Check electric operation of the valve.
Check the valve connections and wiring.
The "Fill clean water tank." message is displayed, in
spite the tank is full.
Low-level clean water sensor faulty Check for proper sensor placement.
Check the floating part moves freely.
Check the sensor connections and wiring.
Check electrical operation of the sensor. (*)
Note (*): see Test instructions service book.
WATER SPILLAGE PROBLEMS
Location of the water Possible Cause Checks and actions
Below the door Dirt or debris under the door seal or chamber flange Execute the monthly maintenance described in the Instructions for
use.
Improper door adjustment Execute the Door adjustment cycle and procedure.
Door seal damaged Replace the door seal.
Below the service door Leak from the front drain connections Check connections and tubes.
From the bacteriological filter Leak of the check valve inside the chamber Check the check valve inside the chamber behind the steam diffuser
Under the sterilizer Leak from the water tank If necessary replace the water tank.
Leak from the tank filter hose Check connections and tubes.
If necessary replace tank filter hoses.
Leak from any of the water tubes (drain, water
pump feed)
Check connections and tubes.
Replace tubes.
PRINTER PROBLEMS
Description Possible Cause Checks and actions
Thermal printer
No report printed Connection problem /
printer power problem
Check the printer serial cable.
Check the printer power supply.
Check (connect or replace) the serial (printer) flat cable coming off the
MMI board.
No paper Check presence of paper.
Printer fault Replace printer.
Wrong printer model selected Set the right printer model. Please refer to the Instructions for use.

Other problems
MN-111| Service book |Errors and Troubleshooting MN-111 ENG Rev08 |2019/06/21 |© 2019 W&H Sterilization Srl 19
USB DEVICE PROBLEMS
Description Possible Cause Checks and actions
USBerror No communication between the MMI to the USB
devices/boards
Check the connections between the HUB, the MMI board and the USB
plug. If all connections are OK, replace the faulty component.
HTML save error or
SCL save error
Impossible to save a file on the USB device Check if the USB device works properly.
Check if there is enough memory space in the USB device.
Note: The SCL files take much more memory space that the HTML files.
Check if the USB device is formatted, format if necessary. Valid
formats are FAT 16 or FAT32.
Is suggest to format the USB device through the sterilizer.
DISPLAY PROBLEMS
Description Possible Cause Checks and actions
Points or lines are missing on the touch screen Connection problems Check display connection on MMI board.
Touch screen failure Replace the MMI board if necessary.
Touch screen is too dark Connection problems Check the sterilizer power supply.
Check MMI board connection.
Check connection MMI removable module.
Touch screen failure contrast off Adjust the display contrast. Please refer to the Instructions for use.
The sterilizer is in SLEEP MODE Press the icon or open or close the chamber door to exit sleep
mode.
Touch screen failure Replace MMI board if necessary.
Touch screen is too bright or show strange colour Connection problems Check MMI board connection (e.g. Display flat cable).
Touch screen failure Replace MMI board if necessary.
Display is working but the touch is not working Connection problems Check MMI board connection (e.g. touchscreen connector).
Touch screen failure Replace MMI board if necessary.
User configuration lost or cycle history lost SD card not detected Check if the SD card in insert properly in the MMI slot.
Replace SD card if necessary (the SD card shall be programmed).
Replace MMI board if necessary.
OTHER PROBLEMS AND MALFUNCTIONS
Description Possible Cause Checks and actions
Wet load at the end of the cycle Chamber overloaded See maximum load weight specified for each cycle and type of load.
Please refer to the Instructions for use.
Wrong load distribution Check if rack and trays are well positioned. See Instructions for use.
Particular load type Extend the drying time.
Bacteriological filter failure Replace the bacteriological filter. Please refer to the Instructions for
use.
Chamber filters obstructed Clean the chamber filters. Please refer to the Instructions for use.
White stains on the load, chamber, trays and/or
chamber rack
Water quality Check the quality of the water used for sterilization and switch to water
of better quality if necessary. If water gets close to the threshold of
15µs/cm conductivity, it may cause spots on sensitive objects such
as mirrors.
Load not properly rinsed and/or dried Ensure that loads get properly rinsed and dried prior to placement in
the sterilizer to prevent stains from minerals of residual tap water.
B&D or HELIX test not passed Leakage See error "100" on page11 and "130" on page12, all causes.
Non conform water Drain and clean the sterilizer water tank. Please refer to the
Instructions for use.
Check external filling system.
Safety valve leakage or sudden opening Load not properly rinsed Clean instruments and sterilizer chamber. Please refer to the
Instructions for use.
Non conform water Drain and clean the sterilizer water tank. Please refer to the
Instructions for use.
Check external filling system.
Chamber not properly rinsed after cleaning Clean sterilizer chamber. Please refer to the Instructions for use.

20 MN-111| Service book |Errors and Troubleshooting MN-111 ENG Rev08 |2019/06/21 |© 2019 W&H Sterilization Srl
Other problems
Description Possible Cause Checks and actions
Cycle time too long Chamber overloaded See maximum load weight specified for each cycle and type of load.
Please refer to the Instructions for use.
Chamber filter obstructed Clean the chamber filter and relevant tubes
Leakage See error "100" on page11 and "130" on page12, all causes.
Water consumption too high Chamber overloaded See maximum load weight specified for each cycle and type of load.
Please refer to the Instructions for use.
Leakage See error "100" on page11 and "130" on page12, all causes.
Water pump failure Run the diagnostic cycle EVX test.
ULKA valve failure See the Test instructions service book, chapter SPECIFIC TESTS FOR
INDIVIDUAL COMPONENTS, Water pump.
Steam generator heater failure Run the diagnostic cycle S. G. Perform. Test
Noisy fan Condenser fan obstructed Check if cables or tubes obstruct the fan.