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:
n
check the mains supply and/or contact the electric Company.
n
replace 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:
n
If the error disappears, replace the cable/sensor that causes the error.
n
If 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.
