Cause or Circumstances Failure Action
Humidier heater
measures OK
Relay boards rev 10 or
higher.
In service mode, verify mains voltage is present at
the input to the humidier isolation transformer. (J55
1-2)
Relay boards rev 9
or lower. Humidier
Interface Board is
mounted on relay board
In service mode, verify mains voltage is present at
the input to the humidier isolation transformer. (J56
1-2) J56 is on Humidier Interface Board mounted
on relay board.
No mains voltage at input
to humidier isolation
transformer. (J55, 1-2)
Defective fuse. Relay
boards rev 10 or higher
Check fuses F3 and F4 on the relay board. If OK,
continue.
Defective fuse. Relay
boards rev 9 or lower.
Humidier Interface
Board is mounted on
relay board.
Check fuses on humidier interface board.
Defective relay board. Replace the relay board.
4.3.14 “Motor Drive Failure” Alarm
Cause or Circumstances Failure Action
The software has detected
that the elevating base
motor was running when
not turned on.
Defective relay board.
Replace the relay board.
NOTE: Humidier will not operate during this failure.
4.3.15 Power Failure (LED Indicator)
Cause or Circumstances Failure Action
No AC power into unit
On/O switch is not
turned on.
Verify cord is plugged into a live wall outlet. Verify
power switch/circuit breaker on back of unit is
turned on.
Mains power is present but
the 5V power supply is not
present.
Defective fuse F1 or F2 on
relay board.
Check the 5 volt supply. Refer to the Tips section
4.6.3. If no 5 volts, possible defective fuses on mains
to the power supply. Check F1 and F2 on relay
board.
Defective power supply.
Check input to power supply for mains voltage. If
present and no 5 volts at output, then power supply
is defective.
4.3.16 “Temperature out of Calibration” Alarm
Cause or Circumstances Failure Action
Calibration data is lost.
Defective calibration. Perform system calibration
Defective control board. If problem persists replace the control board.
© 2001 by Datex-Ohmeda, Inc.. All rights reserved. 6600-0356-000 103 37
Chapter 4: Troubleshooting