LTV 1150 - Page 113

p/n 18603-001, Rev. C LTV
®
1200/1150 Ventilator Service Manual Page 7-35
Symptoms Possible Causes What to Do
HW FAULT alarm. HW FAULT alarms:
AD MMTCH
AD MTCH1
EEPROM
FAN FLT1
HOME ER1
INTRRPT1
INTRRPT2
SYNC ER1
Check the Event Trace to determine the
kind of error and follow the instructions
below for the specific error type. (See the
LTV
®
1200 or the LTV
®
1150 Ventilator
Operator's Manual for instructions on using
the event trace.)
Defective or disconnected
flow valve.
The SERVO test may be used to set the
valve step position explicitly. See Chapter
6 - Maintenance & Calibration for
instructions on using the servo test. The
step position can be viewed using the RT
XDCR DATA display. (See Chapter 3 -
Real-Time Transducer Data for instructions
on using RT data.)
If the flow valve does not respond to the
SERVO controls, open the ventilator and
verify that the flow valve connectors are
securely connected to the motor and
power boards.
Replace the flow valve. See Flow Valve
Assembly in Chapter 8 for instructions.
Defective motor board. Replace the motor board. See Motor Board
Assembly in Chapter 8 for instructions.
Repeated HW FAULT
alarms, delivered
pressures and
volumes are off.
Event Log shows
SYNC ER1 or HOME
ER1.
Defective power board. Replace the power board. . See Power
Board Assembly in Chapter 8 for
instructions.
Repeated HW FAULT
alarms, fan not turning,
ventilator gets
excessively hot.
Event Log shows FAN
FLT1.
Defective or disconnected
fan.
Fan housing screws over-
tight.
Fan operation can be checked by looking
at it through the fan grill on the side of the
vent. If the fan is not operating, open the
ventilator and verify that the fan connector
is securely connected to the power board.
Verify that the fan is mounted flush to the
case and the fan wiring is not pinched
between the fan and case. If the fan wiring
is pinched, it may operate correctly with
the ventilator case open but fail when the
ventilator back panel is tightened down.
Verify that the fan housing screws have not
been over tightened. If the screws are too
tight, the housing may be warped and the
fan may not turn or may turn too slowly.
If the fan wiring has been pinched, or the
fan does not operate, replace the fan
assembly. See Fan Assembly in Chapter 8
for instructions.