Humidifier Failure" Alarm - GE Giraffe OmniBed Service Manual

Chapter 4: Troubleshooting

4.3.18 "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
Humidifier heater measures
OK
No mains voltage at input
to humidifier isolation
transformer. (J55, 1-2)
40
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.
Relay boards rev 10 or higher
Relay boards rev 9 or lower.
Humidifier Interface Board is
mounted on relay board
Defective fuse. Relay boards
rev 10 or higher
Defective fuse. Relay boards
rev 9 or lower. Humidifier
Interface Board is mounted
on relay board.
Defective relay board.
6600-0343-000 104
Action
Refer to section 4.3.20 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 (4.6.6).
In service mode, verify mains voltage is present at the
input to the humidifier isolation transformer. (J55 1-2)
In service mode, verify mains voltage is present at the
input to the humidifier isolation transformer. (J56 1-2)
J56 is on Humidifier Interface Board mounted on relay
board.
Check fuses F3 and F4 on the relay board. If OK,
continue.
Check fuses on humidifier interface board.
Replace the relay board.
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