Humidifier Failure" Alarm - GE Giraffe Service Manual

Chapter 4: Troubleshooting
Cause or Circumstances
Fan is not turning.

4.3.13 "Humidifier Failure" Alarm

NOTE: The "Humidifier Failure" alarm can be caused by non-humidifier issues.
Cause or Circumstances
The Motor Drive Failure
alarm is on.
The Elevating base
does not function. If the
elevating base does not
function, then safety relay
2 is not being energized.
Elevating base functions
36
Failure
Fan or fan hub not seated
properly
Defective fan motor
Defective relay board
Old design fan.
Defective or obstructed
optical sensor. Sensor
holder or sensor gasket
dirty or crazed.
Defective 50 pin ribbon
cable between the relay
and control board.
Defective relay board.
Failure
If this alarm activates, it
opens safety relay 2 and
disables the humidifier.
Defective 50 pin ribbon
cable between the relay
and control board.
Humidifier safety
thermostat is open.
Defective humidifier
heater or humidifier
safety thermostat.
6600-0356-000 103
Action
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.
Replace the fan motor.
Replace the relay board.
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.
Check that sensor, sensor holder, and gasket and
free of dirt or other contaminants. Clean or replace.
Check for continuity on pin 9 (AIRFLOW). If defective,
replace the cable. Refer to the Tips section 4.6.9.
If the problem persists, replace the relay board.
Action
Refer to section 4.3.14 for troubleshooting.
Check for continuity on pin 34 (safety relay 2 control
signal). If defective, replace the cable. If good,
replace the relay board.
Wait for the heater to cool. Cycle power to see if
alarm resets.
Check safety thermostat and humidifier heater
resistance. Refer to the Tips section 4.6.5.
© 2001 by Datex-Ohmeda, Inc.. All rights reserved.