p/n 18603-001, Rev. C LTV
®
1200/1150 Ventilator Service Manual Page 7-13
Symptoms Possible Causes What to Do
Diaphragm is incorrectly
seated in exhalation valve.
Open the exhalation valve and remove the
diaphragm. Reseat the diaphragm and
snap the valve cap back in place. See
Cleaning the Exhalation Valve and
Reusable Patient Circuit in Chapter 4 for a
diagram of the exhalation valve assembly.
High or low side sense line
or elbow at patient wye
loose or leaking.
High or low sense lines are
occluded.
High or low sense ports in
the wye are occluded.
Check high and low pressure sense lines
to be sure they are correctly attached and
securely seated at both the ventilator and
wye ends.
Check the Luer fitting connections for
leaks.
Check the elbow connectors at the wye to
be sure they are not loose.
Verify lines are not occluded or pinched.
Check the exhalation drive line at both the
ventilator and exhalation valve ends. Verify
the line is securely seated and not leaking.
Failed auto zero. Perform an auto zero under XDCR ZERO.
See the LTV
®
1200 or the LTV
®
1150
Ventilator Operator's Manual for more
information.
VHome setting does not
match flow valve.
Correct the VHome setting. See Chapter 6
- Maintenance & Calibration.
Failed calibration. Recalibrate the ventilator. See Chapter 6 -
Maintenance & Calibration for instructions.
If the problem reoccurs after careful
recalibration, a transducer may be drifting
excessively. Perform the Advanced Vte
Diagnostic Procedures, see page 7-23.
Defective flow valve. Calibrate the flow valve. See Flow Valve
Calibration in Chapter 6 for instructions.
Perform the Advanced Vte Diagnostic
Procedures, see page 7-23.
Delivered pressure is
high.
Monitored pressure is
high.
Defective turbine. Perform the Advanced Vte Diagnostic
Procedures, see page 7-23.
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