LTV 1150 - Page 97

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p/n 18603-001, Rev. C LTV

1200/1150 Ventilator Service Manual Page 7-19

Symptoms Possible Causes What to Do

CONTINUED …

PEEP not working.

PEEP low.

PEEP sags during

exhalation (cont)

Internal flexible tubing

occluded or pinched.

Internal flexible tubing has

pinhole leaks or leaking at

connections.

Open the vent and verify that none of the

flexible tubes connected to the

accumulator, solenoid mount assembly,

solenoid manifold, analog board, oxygen

blender or flow valve are pinched or

leaking. See Solenoid Manifold Assembly

or Analog Board Assembly in Chapter 8 for

a routing diagram.

VHome setting does not

match flow valve.

Correct the VHome setting. See Chapter 6

- Maintenance & Calibration.

Delivered and

monitored volumes,

pressures, and

sensitivity are off.

Failed calibration. Recalibrate the vent. 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.

Delivered volume is

high

Diaphragm is incorrectly

seated in the 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.

Patient effort inadequate. Some very small patients and patients with

very weak inspiratory efforts may not be

able to generate a 1 Lpm effort.

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.

Leak Compensation is not

on.

Verify that the Leak Compensation

Extended Features option is set to ON

(default setting is on). See the LTV

1200

or the LTV

1150 Ventilator Operator's

Manual for more information.

Ventilator won't trigger

at sensitivity setting of

1 Lpm.