Service manual

58 Infant Flow
®
SiPAP
675-120 Revision D May 2005
Error
Code
Fault Condition Consequence
Software
Response
Corrective
Action
E90* Spurious software
interrupt, XTAL fails, stack
overflow/ underflow, CPU
Class B exception.
Spurious – software
interrupted and restarts
(possibly during
treatment).
Hardware
reinitialized
(disabled) with
alarm bar on and
audible alarm
sounding to
identify root
cause.
Replace the
main control
PCB and re-
calibrate O
2
and pressure
sensors.
E90 Abnormal hardware,
software or watchdog
reset.
Spurious – software
restarts possibly during
treatment.
Software restarts
‘Error number’
alarm prompt.
Replace the
main control
PCB and
re-calibrate O
2
and pressure
sensors.
E91 Internal software error
detected.
Unusable – software
unreliable.
User lockout
‘Error number’
prompt.
Replace the
main control
PCB and
re-calibrate O
2
and pressure
sensors.
E99 Unknown error detected. Unusable – software
unreliable.
User lockout
‘Error number’
prompt.
Replace the
main control
PCB and
re-calibrate O
2
and pressure
sensors.
* - Generated as a consequence of the fault.