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Sterilizer Manufacturer:
Tuttnauer
Model of Sterilizer:
Problem Title:
Door Closed Indicator Problem Tuttnauer E/EA/EK/EAK
Problem Description:
Door indicator operates in reverse
Reasons
1. See the solutions in details

Solutions

1. Check that the Door Switch is free to move in and out by pressing and
releasing it. If the switch sticks or is stuck replace it.

Check that the green wire is connected to the normally open contact on the Door Switch and that the ground wire is connected to the common.

Check the connector at JP2 on the Ajunc board for loose connection or a broken wire.

Check the wire going to the Door Switch for any shorts to the chassis

Check between TP9 and TP1 with a DC volt meter. Press the Door Switch in and release it. The meter should show 0 to 1 volt when pressed in and 3.5 to 5 volts when the Door Switch is released

If the readings are correct and the indicator still operates in reverse then the problem is with the Digital Predg board or the Flat Cable between the Predg and Ajunc boards.
Inspect the Flat Cable for loose connectors and bent or broken pins. Insure a good connection when reconnecting the Flat Cable
If the problem is still not corrected then replace the Digital Predg board. replace the Digital Predg board
If the readings are not correct then remove the green wire attached to the Door Switch and check continuity across the Door Switch normally open contact with an ohm meter.
When the Door Switch is pressed in the meter should show continuity
When the Door Switch is released the meter should show an open circuit
If the continuity check fails then replace the Door Switch
If the Door Switch is okay then there is a Control Problem

The technical information is just to help sterilizer users as reference to do their trouble shooting.
no guarranty implied. For each specific technical help to do with sterilizers
or autoclaves, go to www.sterilizers.com ... or call 1-800-801-9934 Contact Us