Chapter 6: Alarms and System Failure Codes
System Failure Codes
Service Manual 6-19
6.2.17 System Failure 19
System failure 19 indicates: No Audio Frequency.
6.2.18 System Failure 20
System failure 20 indicates: Display WDOG Time Out.
6.2.19 System Failure 22
System failure 22 indicates: During operation, either the radiant heater or the incubator heater will not
turn ON.
Cause(s) Action(s)
Defective PF Battery PF Battery is only used for power fail. Try powering up the device with the
battery disconnected. If the error clears, replace the battery.
Defective scale Disconnect scale connector at probe panel. Power cycle the device. If the
error clears, replace the scale.
Defective scale harness Disconnect scale harness from J7 on the control board. Power cycle the
device. If the error clears, replace the scale harness.
Defective Servo Oxygen
board
Disconnect the RS485 harness from J8 on the Servo Oxygen board. Power
cycle the device. If the error clears, replace the Servo Oxygen Board.
Defective Servo Oxygen
cable
Disconnect RS485 bus cable from J6 on the control board. Power cycle the
device. If the error clears, replace the RS485 cable going to the Servo
Oxygen board.
Defective audio circuit on
control board
Replace socketed IC U22 on control board. If failure persists, replace the
control board.
Defective control board Replace the control board.
Cause(s) Action(s)
SBC board software is not
performing correctly.
Replace the SBC board.
Cause(s) Action(s)
Refer to other errors. Power down the device. During the system tests after power-up, the
device should detect system failure 15, radiant heater failure, or bed
heater failure. Follow the instructions in this manual for those failures.
Error reading distorted line
signal.
Refer to relay board Figure 8-41.
Refer to the instructions in this manual for system failure 15 (section
6.2.13).
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