4.4.19 System Failure 23
System failure 23 indicates: During operation the system was unable to turn the incubator heater OFF.
Cause(s) Action(s)
Other errors.
Power down the unit. During the system tests after power-up, the unit should detect
system failure 16. Follow the instructions in this manual for this failure.
Defective relay
board.
If system failure 23 persists without system failure 16, replace the relay board.
4.4.20 System Failure 25
System failure 25 indicates: Fan rotation is not being detected.
NOTE: System failure 25 and FAN FAILURE are both triggered by the optical fan sensor not detecting the fan.
If this occurs at power-up a system failure 25 will activate. If it occurs after the power tests are completed the
FAN FAILURE alarm will activate.
Circumstance(s) Cause(s) Action(s)
Fan is not turning
Fan not connected. Check jack.
Fan or fan hub not
seated properly.
Verify the fan hub is properly seated all the way down on the
fan shaft and is seated in the groove at the top of the hub.
Defective relay
board.
Replace relay board.
Defective fan motor. Replace fan motor.
Fan is turning
Fan is turning too
slow.
Check fan speed in service mode, should be about 1500 RPM
in high fan speed. Note that this RPM measurement is only
tested during the power up tests.
Old design fan.
Replace with new design fan. The new fan can be identied
by the grooves molded in the 2 black areas on the bottom
of the fan (side facing the heat sink). The old fan has smooth
surfaced black areas.
Defective or
obstructed optical
sensor. Sensor holder
or sensor gasket dirty
or crazed.
Check that sensor, sensor holder, and gasket and free of dirt or
other contaminants. Clean or replace.
Defective 50 pin
ribbon cable
between the relay
and control board.
Check for continuity on pin 9 (AIRFLOW). If defective replace
cable.
Defective relay
board.
Replace relay board.
© 2001 by Datex-Ohmeda, Inc.. All rights reserved. 6600-0356-000 103 45
Chapter 4: Troubleshooting
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