4.3.14 “Fan Always in High Speed” Alarm
Cause or Circumstances
Failure
Action
Software cannot read
temperature of the heat sink
sensor in incubator heat sink.
Defective heat sink sensor or
harness.
Check the heat sink temperature sensor resistance
in service mode. You can also check heat sink sensor
resistance by disconnecting the harness from J3 at the
control board. Measure between pins 1 and 2. Refer to
If defective, remove the chassis cover and disconnect
the harness from heat sink sensor. Measure sensor
resistance at pins 1-2 on the sensor harness to
determine if sensor or harness is defective.
Defective control board.
If the heat sink sensor and harness measure OK, then
replace the control board.
4.3.15 “Fan Failure” Alarm
Cause or Circumstances
Failure
Action
Fan rotation is not being
detected.
Optical fan sensor not
detecting the fan
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.
Fan is not turning.
Fan or fan hub not seated
properly
Verify the fan hub is properly seated all the way down
on the fan shaft. (It may be necessary to wet the part
to get it to slide all the way down on to the shaft.) Verify
the fan is seated in the groove at the top of the hub.
Defective fan motor
Replace the fan motor.
Defective relay board
Replace the relay board.
Old design fan.
Replace with new design fan. The new fan can be
identified 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 the cable. (Refer to the Tips section, 4.6.11.)
Defective relay board.
If the problem persists, replace the relay board.
38
6600-0343-000 104
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.
Chapter 4: Troubleshooting
Summary of Contents for Giraffe OmniBed
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