M9 & M11 Troubleshooting - Older Models (Red Display)

 

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Troubleshooting The Midmark M9 or M11 Sterilizer
(Models M9, M9D, M11, M11D)

Troubleshooting

Problem Symptom Probable Cause Check Correction

Error Code E001


Power Interruption to PC Control Board
Shuts Down During Sterilization Cycle Overheat Thermostat Activated (Pressure Leak) Check For Pressure Leaks
See Panel 1
Replace Malfunctioning Component At Pressure Leak
    Overheat Thermostat Activated (Not Filling Properly) Check that Filling Lamp illuminates. Be sure Water Level Sensor is dry Replace Water Level Sensor if necessary
M9 WATER LEVEL SENSOR ASSEMBLY
M11 WATER LEVEL SENSOR ASSEMBLY
      Check that Sterilizer is level Adjust Sterilizer to level
    Bad Electrical Connection(s) Check Sterilizer and facility for proper electrical connections Tighten/Replace loose connections
    Faulty Overheat Thermostat (Stuck Open) Perform Continuity Check on Thermostat Replace Thermostat
M9 OverTemp Thermostat
M11 OverTemp Thermostat
  Shuts Down During Drying Cycle Overheat Thermostat Activiated (High input voltage) Check facility input voltage. Voltage should not exceed Electrical input of unit Adjust the dry cycle time Dip Switches
      Check Resistance Of Heating Element (Contact us for Normal Resistance ranges If resistance is out of limits, replace heating element
M9 Heating Element
M11 Heating Element
    Faulty Overheat Thermostat (Stuck Open) Perform Continuity Check On Thermostat Replace Thermostat
M9 OverTemp Thermostat
M11 OverTemp Thermostat

Error Code 2


Stop Button Pressed During Cycle
Shuts Down During Cycle Stop Button Depressed During Cycle   Restart cycle after beeper signal stops

Error Code 3


Stop Button Pressed During Cycle
Shuts Down During Cycle On/Standby Button Depressed During Cycle   Restart cycle after beeper signal stops

Error Code 4


Door Ajar
Shuts Down During Cycle Door Latch Is Not Closed Check if Door Latch is engaging Switch Adjust Door Latch. Clean/Lubricate Door Latch & Pins
    Door Switch Connection Loose Check Door Switch Connection Tighten/Replace Loose Connections
    Door Switch Malfunctioning Perform continuity check on door switch Replace Door Switch
M9 Door Switch
M11 Door Switch

Error Code 5


(Display Pressure Exceeded 35 psi (241 kPA)
Shuts Down During Sterilization Cycle Sterilizer Overloaded Check that the chamber is not over loaded with heavy linen packs Instruct Operator to reduce load size
    Bellows Malfunctioning (closing early) Bellows should close at 212° F (100° C) Replace Bellows
M9 Bellows Assembly
M11 Bellows Assembly
    Sterilizer Potentionmeters out of calibration and/or dirty temperature sensor Clean Temperature Sensor; then check calibration using Presuure Gauge Test Harness Perform Temperature/Pressure Potentiometer Adjustment
    Temperature Sensor Malfunctioning Check Calibration Replace Temperature Probe Assembly (Temperature Sensor)
M9 Temperature Probe Assembly
M11 Temperature Probe Assembly

Error Code 6


Display Temperature exceeded 277° F (136° C)
Shuts Down During Sterilization Cycle Slow Pressure Leak Check for pressure leaks
See Panel 1
Replace malfunctioning component at pressure leak
    Sterilizer Potentionmeters out of calibration and/or dirty temperature sensor Clean Temperature Sensor; then check calibration using Pressure Gauge Test Harness Perform Temperature/Pressure Potentionmeter Adjustment
    Temperature Sensor Malfuntioning Check Calibration Replace Temperature Probe Assembly (Temperature Sensor)
M9 Temperature Probe Assembly
M11 Temperature Probe Assembly

Error Code 7


Display Pressure Dropped Below 24.5 psi (169 kPA)
Shuts Down During Sterilization Cycle Slow Pressure Leak Check for pressure leaks
See Panel 1
Replace malfunctioning component at pressure leak
    Sterilizer Potentionmeters out of calibration and/or dirty temperature sensor Clean Temperature Sensor; then check calibration using Pressure Gauge Test Harness Perform Temperature/Pressure Potentionmeter Adjustment
    Temperature Sensor Malfuntioning Check Calibration Replace Temperature Probe Assembly (Temperature Sensor
M9 Temperature Probe Assembly
M11 Temperature Probe Assembly

Error Code 8
M9 & M11 Only
(Door Switch Did Not Change Status After Door Solenoid Was Activiated

Door Opens At End Of Cycle Door Switch Malfunctioning Perform Continuity Check on Door Switch--Check For Loose connections Replace Door Switch
M9 Door Switch
M11 Door Switch
  Door Does Not Open At End Of Cycle Latch lever & pulse solenoid plunger mechanism malfunctioning Perform M9 & M11 Door Opening Test Remove any debris or build up from Latch Lever & pulse solenoid mechanism
    Door Pins & Latch Bracket not functioning properly Check for burs on door pins & latch bracket in door Remove burs; then clean & lubricate with lithium based grease
    Zero pressure potentionmeter out of calibration

Check calibration of zero pressure potentionmeter

Use The Field Service Calibration Kit

Adjust pressure potentiometer
    Pulse Solenoid Malfunctioning Perform M9/M11 Door Opening Test Replace Pulse Solenoid
M9 Pulse Solenoid
M11 Pulse Solenoid

Error Code 9

(Pressure exceeded 0.9 psi 6.2 kPA during Dry Cycle
M9/M11 - Door Opens at end of Cycle
M9D/M11D - Door is manually opened at end of cycle
Zero pressure potentiometer out of calibration

Check calibration of zero pressure potentiometer

Use The Field Service Calibration Kit

Adjust zero pressure potentiometer
  M9/M11 - Door does not open at end of cycle Latch lever & pulse solenoid plunger mechanism malfunctioning Perform M9/M11 Door Opening Test Remove any debris or build up from latch lever & pulse solenoid mechnanism
    Door Pins & Latch Bracket not functioning properly Check for burs on door pins & latch bracket in door Remove burs then clean & lube with lithium based grease
    Zero pressure potentiometer out of calibration

Check calibration of zero pressure potentiometer

Use The Field Service Calibration Kit
Adjust zero pressure potentiometer
  Door is Closed when error is detected Door was closed during Dry Cycle   Inform Operator Not To Shut Door During Dry Cycle

Error Code 10


(Watchdog timer reset error)
Sterilizer does not complete cycle Control PC Board has had a software/hardware failure Disconnect power; then check for disconnected wiring in sterilizer or facility. Connect power and run an additional cycle If error code persists, replace control PC board

Error Code 11


(Software Interrupt Error)
Sterilizer does not complete cycle Control PC board has a software/hardware malfunction Disconnect Power for approximately 10 seconds; then reconnect power and run additional cycle If error code persists, replace control PC board

Error Code 12


(Ram Test Error)
Sterilizer does not complete cycle Control PC Board has a software/hardware malfunction Disconnect Power for approximately 10 seconds; then reconnect power and run additional cycle If error code persists, replace control PC Board

Error Code 13


M9D & M11D Only
(Door switch status unchanged since last cycle)
Sterilizer does not complete cycle Door switch is malfunctioning Perform continuity check on door switch Replace door switch
M9 Door Switch
M11 Door Switch

Blown Fuses

Main fuse on PC Board blown Short in pulse solenoid Unplug pulse solenoid, then run M9/M11 Door Opening Test Replace Pulse Solenoid
M9 Pulse Solenoid
M11 Pulse Solenoid

No Display lights

Unit displays temperature & pressure, but does not show LED Status Lights     Disconnect power for approximately 30 seconds. Then connect power and check for proper operation

Low Water Light
(Comes on after approximately 5 minutes)

Water continuously fills chamber Water level sensor dirty or malfunctioning Clean water level sensor; then perform continuity check Replace water level sensor
M9 WATER LEVEL SENSOR ASSEMBLY
M11 WATER LEVEL SENSOR ASSEMBLY
    Temperature Sensor malfunctioning Disconnect Temperature Sensor from PC Board; then check for proper operation Replace Temperature Probe Assembly (Temperature Sensor)
M9 Temperature Probe Assembly
M11 Temperature Probe Assembly
  Water is not entering chamber Filter is dirty/clogged Clean filter with SpeedClean & brush or in ultrasonic cleaner Replace filter if necessary
    Debris trapped in fill solenoid Disassemble fill solenoid & remove any debris Replace fill solenoid

Low Water Light


(Comes on Immediately)
(Older style units only)
Low water light illuminates as soon as cycle is started Condensor tank level sensor malfunctioning   Unplug Sensor from PC Board & permanently jumper connection on PC board

Sterilizer Has No Power

No response when ON/STANDBY is pushed (no lamps illuminate) Sterilizer is not plugged in Check that power cord is plugged into sterilizer and power outlet Plug in cord to sterilzer or outlet
    Fuse blown on Control PC Board Perform continuity check on Control PC Board fuses Replace fuses
    Thermostat activated Check for voltage at input to control PC Board from thermostat Wait for sterilizer to cool. Re-check voltage. If none, replace thermostat
M9 OverTemp Thermostat
M11 OverTemp Thermostat

Fill Cycle Malfunction

Unit Skips Fill Cycle Water level sensor wet from previous cycle   Allow Chamber water level sensor to air dry or remove and hand dry
  Chamber fills very slowly Filter/Tubing plugged Remove filter and tubing and inspect Replace/clean filter and/or tubing
    Chamber water level sensor malfunctioning or dirty Unplug sense from PC Board & jumper connection on board. Check for proper operation Replace/clean Chamber water sensor
  Chamber overfills with water Chamber water level sensor malfunctioning or dirty Unplug sense from PC Board & jumper connection on board. Check for proper operation Replace/clean water level sensor
  Chamber Overfills with water Chamber water level sensor malfunctioning or dirty Unplug sense from PC Board & jumper connection on board. Check for proper operation Replace/clean water level sensor
    Loose, broken or dirty connection between Chamber water sensor and Control PC Board Perform continuity check btween connector and Chamber water sensor Replace/clean broken wires or connections
    Sterilizer is not level Check sterilizer for level installation Re-install sterilizer on a level surface, adjust height of individual foot levelers, or shim up sterilizer
    Ground screw on PC Board missing Check PC Board Ground Screw Replace ground screw
    Temperature Sensor malfunctioning Unplug temperature sensor from PC Board then check for proper operation Replace Temperature Probe Assembly (Temperature Sensor)
    Fill solenoid malfunctioning or stuck Check resistance of solenoid Replace/clean fill solenoid
    Control PC Board malfunctioning Check all propbable causes listed above Replace control PC Board

Door Does Not Open After Vent Cycle


M9/M11 Only
Pulse solenoid energizes but door does not open Latch lever binding Operate Latch lever by hand to check for resistance Clean/Lubricate Latch Lever
    Door Latch Binding Operate Door Latch by hand to check for resistance Clean/Lubricate Latch Lever
    Tray rack not pushed all the way into chamber, causing interference with door Check to see if tray rack is installed properly so that it does not interfer with door Install tray rack properly to make sure that it does not interefere with door
    Pressure Zero potentiometer out of calibration   Adjust Pressure Zero Potentiometer

Chamber Does Not Vent Properly

Door opens after a longer than normal venting period
(M9/M11)

Open The Door Lamp illuminates after longer than normal venting period -
M9D/M11D
Drain, filter or vent tubing plugged Remove filter and tubing and inspect Clean, drain and flush tubing. Replace/Clean filter
    Vent Solenoid malfunctioning or stuck Check resistance of solenoid coil Replace/clean vent solenoid

Temperature Does Not Go Above 215° F (101° C)

Unit will not complete sterilization cycle Slow Pressure Leak Check for pressure leaks
See Panel 1
Replace malfunctioning component at pressure leak

Instruments Not Drying

Instruments are wet after drying cycle is complete Door is not opening at end of vent portion of cycle See Problem: "Door Does Not Open After Vent Cycle" above  
    Sterilizer is not level Check sterilizer for level installation Re-install sterilizer on a level surface, adjust height of individual foot levelers, or shim up sterilizer to level
    Filter is plugged Check that no water is left in Chamber after venting portion of cycle Replace/clean filter

Open The Door Lamp Does Not Illuminate


(M9D/M11D Only)
OPEN THE DOOR lamp does not illuminate at the end of sterilization cycle Pressure potentiometer out of adjustment Display PC Board check will show zero pressure setting Adjust pressure potentiometer

Code "C001"


M9D/M11D Only
(Low Water Error)
Cycle will not run Water level in condensing tank is too low Check water level in condensing tank Fill condensing tank with distilled water
  Cycle will not run.
Condensing Tank is full
Fill solenoid valve is malfunctioning or stuck Check resistance of fill Solenoid Replace Fill Solenoid
    Water level sensor dirty or malfunctioning Clean water level sensor; then perform continuity check Replace water level sensor
M9 WATER LEVEL SENSOR ASSEMBLY
M11 WATER LEVEL SENSOR ASSEMBLY
  Chamber Overfills with water Temperature sensor malfunctioning Disconnect temperature sensor; then check for proper operation Replace temperature sensor

Code "C002"

M9D & M11D Only
(Door Ajar)
Cycle will not run Door Ajar   Close Door

Code "C003"


M9D & M11D Only
Dry Cycle Error)
Dry Cycle Did not start Door was not opened within 30 minutes after venting   Re-run Cycle. Open Door within 30 minutes after venting