Respironics ESPRIT Service Manual page 93

Diagnostic Code
5000
Troubleshooting
REF 580-1000-02 G
A diagnostic code 5000 occurs when a significant pressure differential is
detected between the Inspiratory and exhalation sides of the tubing circuit.
This pressure differential can be caused by blocked tubing (due to liquid
accumulation or a pinched circuit), increased exhalation filter resistance, or
increased resistance caused by additional bacteria filters in line for nebulizer
treatments.
When the ventilator enters an occlusion state, it opens the exhalation valve and
safety valve, then closes them and attempts to deliver a patient breath. If the
pressure differential still exists, the ventilator repeats the process (up to 40
times per minute). During an occlusion state, the ventilator enters the safety
valve open (SVO) state (not VENT INOP).
NOTE: If pressure displays do not drop to 0 ± 0.1 cmH
ventilator to enter normal ventilation mode. After the ventilator completes
POST, cycle power to the ventilator to enter diagnostic mode and re-run
the test.
Follow these steps to determine the cause and repair for a 5000 diagnostic
code:
1. Connect a patient circuit, including test lung, to the ventilator and
turn the ventilator ON in diagnostic mode.
2. Touch Hardware to view the Hardware screen, then select these
settings:
• Touch Air and set to 1 LPM.
• Touch Exhalation and set to 2000 Steps.
• Touch Safety to energize (white background indicates energized).
3. Block the patient wye, then watch the Inhalation Pressure and
Exhalation Pressure displays on the Hardware screen as they rise from
0 cmH O to the highest stable point (the PRV cracking pressure). If
2
the difference between the pressure displays is greater than 2 cmH
at any time, note which is higher.
4. Unblock the patient wye to allow pressures to return to 0 ± 0.1
cmH O, then repeat for Air settings of 2, 3, 4, and 5 LPM.
2
5. With circuit pressure at the PRV cracking pressure, touch Inhalation
and verify that the pressure displays drop to 0 ± 0.1 cmH
immediately when energized (white background) and returns to circuit
pressure when deenergized, without displaying any pressures between
0 cmH O and PRV cracking pressure.
2
6. With circuit pressure at the PRV cracking pressure, touch Exhalation
and verify that the pressure displays drop to 0 ± 0.1 cmH
immediately when energized (white background) and returns to circuit
Esprit® Ventilator Service Manual © Respironics, Inc.
Chapter 6
Diagnostic Codes
O, cycle power to the
2
O
2
O
2
O
2
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