Cause or Circumstances Failure ActionHumidifier heatermeasures OKRelay boards rev 10 orhigher.In service mode, verify mains voltage is present atthe input to the humidifier isolation transformer. (J551-2)Relay boards rev 9or lower. HumidifierInterface Board ismounted on relay boardIn service mode, verify mains voltage is present atthe input to the humidifier isolation transformer. (J561-2) J56 is on Humidifier Interface Board mountedon relay board.No mains voltage at inputto humidifier isolationtransformer. (J55, 1-2)Defective fuse. Relayboards rev 10 or higherCheck fuses F3 and F4 on the relay board. If OK,continue.Defective fuse. Relayboards rev 9 or lower.Humidifier InterfaceBoard is mounted onrelay board.Check fuses on humidifier interface board.Defective relay board. Replace the relay board.4.3.14 “Motor Drive Failure” AlarmCause or Circumstances Failure ActionThe software has detectedthat the elevating basemotor was running whennot turned on.Defective relay board.Replace the relay board.NOTE: Humidifier will not operate during this failure.4.3.15 Power Failure (LED Indicator)Cause or Circumstances Failure ActionNo AC power into unit On/Off switch is notturned on.Verify cord is plugged into a live wall outlet. Verifypower switch/circuit breaker on back of unit isturned on.Mains power is present butthe 5V power supply is notpresent.Defective fuse F1 or F2 onrelay board.Check the 5 volt supply. Refer to the Tips section4.6.3. If no 5 volts, possible defective fuses on mainsto the power supply. Check F1 and F2 on relayboard.Defective power supply.Check input to power supply for mains voltage. Ifpresent and no 5 volts at output, then power supplyis defective.4.3.16 “Temperature out of Calibration” AlarmCause or Circumstances Failure ActionCalibration data is lost. Defective calibration. Perform system calibrationDefective control board. If problem persists replace the control board.© 2001 by Datex-Ohmeda, Inc.. All rights reserved. 6600-0356-000 103 37Chapter 4: Troubleshooting
