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4/Tests and Troubleshooting
Alarm Message/
Symptom
Control setting input has
failed
Minimum system monitor-
ing
CPU Failure
Minimum System Shut-
down
CPU Internal Error
Minimum System Shut-
down
Display Voltage Out-of-
Range
Minimum System Shut-
down
Flow Valve Failure
Minimum System Monitor-
ing
Gas Inlet Valve Circuit Fail-
ure
Minimum System Monitor-
ing
Internal Ventilator Clock
Too Fast
Minimum System Shutdown
Internal Ventilator Clock
Too Slow
Minimum System Shut-
down
Logical Watchdog Failure
Minimum System Shut-
down
4-42
1503-0151-000
Condition/Probable Cause
Internal software error has
occurred in a control setting
change initiated by the user.
Monitoring still available
ALU, register,... test failure.
Monitoring is not functioning or it
is unreliable
Internal bus error. Monitoring is
not functioning or unreliable
Voltage out-of-range. Monitoring
is not functioning or unreliable
Incorrect feedback. Monitoring
is still available
Incorrect feedback. Monitoring
still available
Clock frequency greater than
110% of expected value. Moni-
toring is not functioning or unreli-
able
Clock frequency less than 90%
of expected value. Monitoring is
not functioning or unreliable
Time-out or incorrect code exe-
cuted. Monitoring is not func-
tioning or unreliable
5/26/0
Service Action
Reboot ventilator, if problem con-
tinues replace CPU board
Reboot ventilator, if problem con-
tinues replace CPU board
Reboot ventilator, if problem con-
tinues replace CPU board
1. Reboot ventilator, if problem
continues, measure EL display
+14.5V (10-15V) volts at J3 pin 18
to pin 11.
2.If out of spec, disconnect Dis-
play board. Measure again. If
within spec; replace Display
board, continue
3. If still out of spec, disconnect
CPU board. Measure again. If
within spec, continue.
4. Replace CPU board. Measure
again. If still out of spec, discon-
nect PSB, continue.
5. Replace PSB
1. Reboot ventilator, if problem
persists, continue:
2. Disconnect the connector to
flow valve at J7. Refer to service
mode Test Flow Valve diagnostic
in section 4.
1. Reboot ventilator, if problem
persists, continues
2. Disconnect the connector to
GIV at J6. Refer to service mode,
Test GIV, Section 4.
Reboot ventilator, if problem con-
tinues replace CPU board
Reboot ventilator, if problem con-
tinues replace CPU board
Reboot ventilator, if problem con-
tinues replace CPU board
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Chapters
Table of Contents
Troubleshooting
