M9/M11 Sterilizer Door Switch Error Codes: C326 to C385 Troubleshooting

WARNING

To prevent risk of shock always disconnect power before removing covers or performing any service procedure.

WARNING

Some procedures require power to be connected with covers removed. Line voltage is present. Use extreme caution to prevent electric shock.

C326

Display / Symptom	Cause	Check	Action
C326: DOOR MODE DOOR CLOSED OPEN DOOR Door switch indicates that the door remains closed one second after door motor has attempted to open door.	Door spring missing / damaged.	If the door motor releases the latch, but the door remains closed. Inspect door spring for damage.	Replace door springs.
		Verify if door is at the vented position. Push in on door with out lifting handle.
		Verify the QTY of door springs. (M11- QTY 2, M9-QTY 1)
		Verify door springs are at a 45 degree angle.	Place door spring at a 45 degree angle.
	Door / Dam gasket(s).	Inspect door / dam gaskets for proper installation and any signs of sticking.	Install door / dam gaskets properly.
	Door / Dam gasket(s).	If new gasket, check if wire ring in gasket is preventing gasket from fully being seated.	Temporarily remove wire ring. Re-install wire ring after gasket is fully seated.
	Trays not pushed in properly.	Be sure trays slide in properly.	Remove obstructions that prevent the trays from sliding in completely.
	Door pins / latch binding.	With door open, door handle should move Up / Down freely.	Clean door pins / latch mechanism. Clean with Synthetic Dry Protectant - Aerosol / Spray on.
		With door open, door handle should move Up / Down freely.	Tightened door pins/latch mechanism.
		Inspect latch mechanism for wear / damage.	Replace worn / damaged components.
	Door motor system / latch “hanging up”.	Remove the door cover and RH side panel. With the door closed, run the ‘Door Open Test’. Watch for any mechanical issues that may prevent the door from opening. Refer to: Service Diagnostics (I/O Test)	Replace worn / damaged components.
		Verify door motor is angled as close to PC board as possible.	Adjust door motor angle.
		Check if the connecting rod is installed in the proper location on the door motor cam. 9 for M9, 11 for M11	Install connecting rod in the proper 9 or 11 location on the door motor cam.
	Door motor defective.	Remove the door cover and RH side panel. With the door closed, run the ‘Door Open Test’. Watch for any mechanical issues that may prevent the door from opening. Refer to: Service Diagnostics (I/O Test)	Replace door motor.
	Door hinge binding.	Check for binding or build up of debris in the door hinges.	Clean debris from hinges.
	Door hinge binding.	If debris cannot be cleaned from hinges to remove binding	Send unit to Midmark for factory Repair and Return.
	Door switch / PC board malfunctioning.	Test switch with the door OPEN and CLOSED.	Replace door switch.
		Perform Door Switch Continuity Test. With door closed, disconnect door switch wires from J1 and J2 of Main PC board. Place meter probes on door switch wires. If Continuity is not present replace door switch. Refer to: Door Switch Continuity Test	Replace door switch.
		Check supply voltage from PC board. Line voltage 120 or 230 VAC. Refer to: Door Switch Supply Voltage Test	Replace Main PC board.
	Door switch activation tab obstructed.	Check for full movement of activation tab.	Remove any obstruction.
	Residual pressure in chamber.	Check for chamber pressure when door motor is energized.	Clear any restriction that could prevent chamber pressure from reaching the pressure transducer on PC board.
		Check the load size. Refer to User Guide. Verify that nothing is touching or crowding the temperature sensor.	Reduce load size.
		If pressure is above 0.72 psi (5 kPa), check for blockage in the pressure sensor tubing between the PC board and the chamber.	Clear blockage / replace pressure transducer tubing.
		Check if chamber filter is clogged.	Clean / Replace filter. Clean with Speed-Clean and brush.

C382

Display / Symptom	Cause	Check	Action
C382: FILL MODE DOOR OPEN ITEMS NOT STERILE CLOSE DOOR	Door switch contacts opened during Fill Mode.	Check with operator to determine if door was opened during fill mode.	Close door. Cycle will continue where it left off.
	Door / Dam gasket(s).	Inspect door / dam gaskets for proper installation and any signs of sticking.	Install door / dam gaskets properly.
	Door / Dam gasket(s).	If new gasket, check if wire ring in gasket is preventing gasket from fully being seated.	Temporarily remove wire ring. Re-install wire ring after gasket is fully seated.
	Door switch activation tab obstructed.	Check for full movement of activation tab.	Remove any obstruction.
	Tray rack / tray plate not installed properly.	Inspect tray rack / tray plate for proper installation. The 45 degree angled end of tray plate must be positioned upward and to the back of the chamber.	Install tray rack / tray plate properly.
	Door switch / PC board malfunctioning.	Test switch with the door OPEN and CLOSED.	Replace door switch.
		Perform Door Switch Continuity Test. With door closed, disconnect door switch wires from J1 and J2 of Main PC board. Place meter probes on door switch wires. If Continuity is not present replace door switch. Refer to: Door Switch Continuity Test	Replace door switch.
		Check supply voltage from PC board. (Line voltage 120 or 230 VAC) Refer to: Door Switch Supply Voltage Test	Replace Main PC board.
	Door motor system / latch “hanging up”	Place in Service Diagnostics Mode. With the door closed, run the Door Open Test. Watch for any mechanical issues that may prevent full rotation of door motor cam. Refer to: Service Diagnostics (I/O Test)	Replace door motor

C383

Display / Symptom	Cause	Check	Action
C383: HEATUP MODE DOOR OPEN ITEMS NOT STERILE CLOSE DOOR	Door switch contacts opened during Heat Up mode.	Check with operator to determine if door was opened during Heat Up mode.	Close door. Cycle will continue where it left off.
	Door / Dam gasket(s).	Inspect door / dam gaskets for proper installation and any signs of sticking.	Install door / dam gaskets properly.
	Door / Dam gasket(s).	If new gasket, check if wire ring in gasket is preventing gasket from fully being seated.	Temporarily remove wire ring. Re-install wire ring after gasket is fully seated.
	Door switch activation tab obstructed.	Check for full movement of activation tab.	Remove any obstruction.
	Tray rack / tray plate not installed properly.	Inspect tray rack / tray plate for proper installation. The 45 degree angled end of tray plate must be positioned upward and to the back of the chamber.	Install tray rack / tray plate properly.
	Door pins / latch binding.	With door open, door handle should move Up / Down freely.	Clean door pins / latch mechanism. Clean with Synthetic Dry Protectant - Aerosol / Spray on.
	Door pins / latch binding.	Inspect latch mechanism for wear / damage.	Replace worn / damaged components.
	Door motor system / latch “hanging up”.	Remove the door cover and RH side panel. With the door closed, run the ‘Door Open Test’. Watch for any mechanical issues that may prevent the door from opening. Refer to: Service Diagnostics (I/O Test)	Replace worn / damaged components.
		Verify Door Motor is angled as close to PC board as possible.	Adjust door motor angle.
		Remove the door cover and RH side panel. With the door closed, run the ‘Door Open Test’. Watch for any mechanical issues that may prevent the door from opening. Refer to: Service Diagnostics (I/O Test)	Replace door motor.
	Door hinge binding.	Check for binding or build up of debris in the door hinges.	Clean debris from hinges.
	Door switch / PC board malfunctioning.	Test switch with the door OPEN and CLOSED.	Replace door switch.
		Perform Door Switch Continuity Test. With door closed, disconnect door switch wires from J1 and J2 of Main PC board. Place meter probes on door switch wires. If Continuity is not present replace door switch. Refer to: Door Switch Continuity Test	Replace door switch.
		Check supply voltage from PC board. Line voltage 120 or 230 VAC. Refer to: Door Switch Supply Voltage Test	Replace Main PC board.

C384

Display / Symptom	Cause	Check	Action
C384: STERILIZE MODE DOOR OPEN ITEMS NOT STERILE UNPLUG REPLUG UNIT	Door switch / PC board malfunctioning.	Test switch with the door OPEN and CLOSED.	Replace door switch.
Perform Door Switch Continuity Test. With door closed, disconnect door switch wires from J1 and J2 of Main PC board. Place meter probes on door switch wires. If Continuity is not present replace door switch. Refer to: Door Switch Continuity Test
Check supply voltage from PC board. (Line voltage 120 or 230 VAC) Refer to: Door Switch Supply Voltage Test	Replace Main PC board.

Display / Symptom

Cause

Check

Action

C384: STERILIZE MODE DOOR OPEN

ITEMS NOT STERILE UNPLUG REPLUG UNIT

Door switch / PC board malfunctioning.

Test switch with the door OPEN and CLOSED.

Replace door switch.

Perform Door Switch Continuity Test. With door closed, disconnect door switch wires from J1 and J2 of Main PC board.

Place meter probes on door switch wires.

If Continuity is not present replace door switch. Refer to: Door Switch Continuity Test

Check supply voltage from PC board. (Line voltage 120 or 230 VAC)

Refer to: Door Switch Supply Voltage Test

Replace Main PC board.

C385

Display / Symptom	Cause	Check	Action
C385: VENT MODE DOOR OPEN ITEMS NOT STERILE UNPLUG REPLUG UNIT	Door switch / PC board malfunctioning.	Test switch with the door OPEN and CLOSED.	Replace door switch.
Perform Door Switch Continuity Test. With door closed, disconnect door switch wires from J1 and J2 of Main PC board. Place meter probes on door switch wires. If Continuity is not present replace door switch. Refer to: Door Switch Continuity Test
Check supply voltage from PC board. Line voltage 120 or 230 VAC. Refer to: Door Switch Supply Voltage Test	Replace Main PC board.