Table of Contents
4.4.6 System Failure 6
System failure 6 indicates: Defective overtemp DAC circuit on the control board.
Cause(s)
System calibration required.
Defective control board.
4.4.7 System Failure 7
System failure 7 indicates: 1.0 V Thermistor reference voltage is out of 0.951V - 1.049V range.
Cause(s)
System calibration required.
Defective control board.
4.4.8 System Failure 8
System failure 8 indicates: No Line Frequency. When troubleshooting this error code, have control board, 50 pin
ribbon cable, and relay board on hand.
Cause(s)
Defective control board.
Defective 50 pin ribbon cable between
the relay board and control board.
Defective relay board.
4.4.9 System Failure 11
System failure 11 indicates: The ADC on the control board is not operating to spec (too slow).
Cause(s)
Defective humidifier sensor
or cable
Defective control board.
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.
Action(s)
Measure the signal on the control board between J9 pin 43, and TP1-4
(Ground). It should be a 120 hertz signal. If the signal is OK, replace the control
board.
If no signal, check continuity on the 50 pin cable, pin 43. If defective, replace
the cable.
Replace the relay board.
Action(s)
Disconnect J1 on the control board. If it powers up OK, either the cable or the humidity
sensor is defective. Reconnect J1 and disconnect the 4 pin humidity sensor connector in
the compartment probe. If the unit now powers up OK, the humidity sensor is defective. If
not, the cable is defective.
If the error persists with the replaced sensor or cable, replace the control board.
Action(s)
Perform system calibration.
Replace the control board.
Action(s)
Perform system calibration.
Replace the control board.
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Chapter 4: Troubleshooting
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Table of Contents
Troubleshooting
