The vent valve is normally closed. When energized, the valve opens. The vent valve LED on the PC board indicates current flow to the vent valve. On: valve energized and Off: valve not energized.

1.To turn current flow to vent valve On/Off, Press the <START> button.

•When the Vent Valve LED is On the PC board is supplying current to valve.

•When the Vent Valve LED is Off there is no current to valve.

If a problem is suspected, perform the Vent Valve Voltage Test.

Press <STOP> button to advance the display to the next test.

The door motor test allows you to operate the door motor without running a cycle. When energized, the door motor will run to open or closed the door depending on the starting position of the door switches.

Example: If the door open switch is tripped, the door motor will close the door when energized. If the door closed switch is tripped, the door motor will open the door when energized.

The Door Open LED on the PC board is illuminated when the door motor is opening the door. The Door Closed LED on PC board is illuminated when the door motor is closing the door.

1.To energize the door motor press the <START> button.

•When the Door Open or Door Closed LED light is on the PC board is supplying current to door motor.

•When LED light is off there is no current to door motor.

If a problem is suspected, perform the Door Motor Voltage Test.

Press <STOP> button to advance the display to the next test.

The water pump test allows you to manually energize the pump. When energized, the water pump LED illuminates, indicating current flow to the pump.

1.To turn current flow to water pump ON / OFF press the <START> button.

•When water pump LED is ON the PC board is supplying current to the pump.

•When water pump LED is OFF there is no current to pump.

1.Check that the reservoir is filled with distilled water.

2.With top cover removed, go into Service Diagnostics.

3.Toggle to the Water Pump Test display screen.

4.Press <START> button once to energize and prime the water pump, until air is purged from plastic tubing connecting water pump to the boiler.

5.Press <START> again to de-energize water pump. Do not energize water pump for more then 20 seconds at a time.

The boiler test allows you to manually energize the boiler for 15 second increments. There are two boiler LEDs that illuminate to indicate current flow to the boiler.

When the two boiler LEDs are On the PC board is supplying current to the boiler. When the two boiler LEDs are Off there is no current to boiler.

1.To turn current flow to boiler On / Off press the <START> button.

To verify proper operation

When the two boiler LEDs turn off after approx. 15 seconds, press the <STOP> button to advance to the Temperature Display Screen. The internal temperature of the boiler is shown as BOIL. If the display does not reflect an increase in temperature, perform the Boiler Voltage Test.

Press <STOP> button to advance the display to the next test.

The dry heater test allows you to manually energize each of the two dry heaters independently for 15 second increments. There is a separate LED for each heater that illuminates to indicate current flow to that heater.

1.To turn current flow to dry heater ON / OFF press the <START> button.

•When the dry heater LED is ON the PC board is supplying current to that dry heater

•When the dry heater LED is OFF there is no current to dry heater.

To verify proper operation

When the dry heater LED turns off after approximately 15 seconds, press the <STOP> button to advance to the Temperature Display Screen. The temperature of the dry heater #1 is shown as DH1. If the display does not reflect an increase in temperature, perform the Dry Heater Voltage Test below.

This test allows you to manually energize the condensation heater. The condensation heater LED illuminates to indicate current flow to the heater.

1.To turn current flow to condensation heater ON / OFF Press the <START> button

•When the condensation heater LED is ON the PC board is supplying current to the heater.

•When the condensation heater LED is OFF there is no current to heater.

To verify proper operation

After the heater has been ON for approx. 1 minute, touch the front panel above the chamber. This area should feel warm. If the panel does not feel warm, perform the Condensation Heater Voltage Test.

Point 1: Door / Tray Gasket.

1.Check for water or steam leakage from around Door / Tray.

2.Clean or replace Door / Tray Gasket.

Point 2: Vent Valve.

1.Check plastic tube connecting unit to the external condensing tank for a flow of steam and hot water in between vent valve operations.

2.Clean or replace Vent Valve.

Point 3: Pressure Relief Valve.

1.Check for water or steam leakage from under the back left hand corner of sterilizer.

2.Pop off and re-seat, or replace Pressure Relief Valve..

Point 4: Pressure Sensor Tubing.

1.Check for water or steam leakage onto main PC board where pressure sensor tubing attaches to pressure transducer.

2.Reattach or replace Pressure Sensor Tubing.

Point 5: Fittings.

1.Check all plumbing fitting connections for leakage.

2.Tighten or replace fittings.

Point 6: Pump Check Valve.

1.Check the pump to boiler water line for air bubbles pushing back into the pump when the sterilizer is building pressure.

2.Replace Pump.

Boiler Temperature Sensor Test

1.Disconnect sensor harness from J10 on PC board.

2.Set meter to 2k ohms Ω.

3.Place meter probes on the red and white wires. The acceptable reading is 1.07k to 1.1k ohms Ω.

Chamber Temperature Sensor Test

1. Disconnect sensor harness from J11 on PC board.

2.Set meter to 2k ohms Ω.

3.Place meter probes on the red and white wires. The acceptable reading is 1.07k to 1.1k ohms Ω.

4.Clean sensor with mild soap and distilled water.

The thermostat is located under the boiler assembly. A manual reset button is located in between the terminals of the thermostat.

1.Disconnect wires from thermostat.

2.Place meter probes on thermostat terminals. Set meter to ohms Ω.

With switch Untripped
Meter Reading	Required Action
Any resistance reading	Switch is good.
OL	Replace switch

1.Unplug unit from power source.

2.Remove top cover. Refer to: Top Cover

3.Disconnect switch connector from PC board.

4.Set meter to check continuity.

5.Flip switch to OFF and probe both neutral and line sides.

6.Flip switch to ON and probe both neutral and line sides.

With switch Off
Meter Reading	Required Action
OL	Switch is good.
Any other reading	Replace switch

With switch On
Meter Reading	Required Action
0 Ohms	Switch is good.
Any other reading	Replace switch

1.Remove top cover. Refer to: Top Cover

2.Verify photo interrupter is connected to PC board at J12.

3.Verify no debris on photo interrupter sensor. May clean with q-tip.

4.Activate Service Diagnostics and scroll to Interlock disengaged on display screen.

5.Pull cotter pin of plunger forward, screen display should read, Interlock engaged.

Display Reading	Position	Required Action
Interlock Engaged	Pressurized	Photo interrupter is good.
Interlock Disengaged	Depressurized	Photo interrupter is good.
Anything different than above states.	Any	Replace photo interrupter.