TROUBLESHOOTING
7-4 SERHT50NA A0808
Baseline shows PEEP
w/ PEEP set to zero.
PROBLEM POTENTIAL CAUSE SUGGESTED CORRECTIVE ACTION
Water inside exhalation valve
diaphragm.
Kinked or obstructed exhalation or
proximal pressure tubing.
Paw meter needs calibration.
Contaminated solenoid.
Disconnect the exhalation drive line tubing,
then turn exhalation valve upside down to
allow any water that is trapped to exit. If
problem still persists, replace exhalation
valve.
Check and correct as needed. Replace
inline proximal filter.
Calibrate. (See Section 5.)
Replace Pump Assembly.
(Note: Solenoid is part of the pump)
Proximal pressure returns
to baseline very slowly.
Kinked or obstructed proximal pressure
line.
HME causing resistance to exhalation.
Check and correct as needed. Replace
inline proximal filter.
Remove/change HME.
Pump is emitting
“squeaking” noise.
Contamination on the piston rods. Using alcohol and a non-residue type
material (i.e. gauze), gently clean piston
rods. If problem is not corrected, replace
Pump Assembly.
Pump is emitting
“ticking” noise.
Loose bearing. Replace Pump Assembly.
Pump loudness seems
to be much greater than
normal.
Large leak in breathing circuit.
Internal muffler is disconnected.
Problem with Pump Assembly
Resolve leak.
Open lower case and make sure that the
muffler is connected securely at both ends
with the appropriate silicone cuff. Perform
System Leak Test in Section 5.
Replace Pump Assembly.
Vibration noise (i.e. bezel,
humidifier, retaining arm, etc.)
Improper Assembly Secure all external screws to 12" lbs.
Tighten all thumbscrews or knobs securely.
Front panel cover is loose,
rattling, or not shutting
properly.
Physical damage to the front panel
cover.
Remove and replace front panel cover.
Verify that the springs are present on both
ends of the cover.
Unit triggers with PEEP
set > 0
Leak in circuit.
Exhalation valve not calibrated.
Check circuit for leaks.
Calibrate exhalation valve.
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