Ohmeda Engstrom Troubleshooting

A leak in the vent engine is causing high air and O2 pressure

Since these leaks can occur from different parts within the engine, close the air and O2 valves to limit this number of components. Then apply the Vent Engine Leak Test.

1) Open the manual air shut off valve

2) Verify the air supply pressure reads “pipeline pressure” and the O2 supply pressure reads “0.0 psig”

3) Verify the INSP outlet is unplugged

4) On the display unit set the O2 DAC count to 60,000 (this releases any built-up pressure in the system)

5) Close the manual air shut off valve

6) On the display unit select “high air leak” to start test (leak rate should not exceed 50ml/min)

If the leak still persists then refer to our replacement guide on replacing the vent engine from the chassis

The display does not power on or show any necessary information

• Display connection (1).
• DIS connector - supports D-O Device Interface Solution (DIS) (2)
• Network connection - Standard Ethernet port for network connectivity (3).
• Network ID - accepts D-O proprietary network identification plug (4).
• USB port - standard USB interface for external communication (5).

• Refer to our display unit replacement manual

The internal gas pressure is too high

Before disconnecting pneumatic fittings, bleed all gas pressure from the ventilator

1. Disconnect all gas supplies from the source.
2. Set the system switch to On.
3. Ensure that all pressures read zero.
4. Establish a flow for the affected gas to bleed down the pressure.
5. Set the system switch to Standby.

The display feels excessively hot while on.

This filter is located behind the display unit on the bottom right. It can be removed simply by pulling it out of its tab slot. Clean by rinsing with water, then dry before re-inserting it.

Chassis feels very hot and a warning alarm has appeared on the ventilator display.

Inspect the main chassis dust filter. This filter is located at the center of the back panel of the main chassis, under a black cover with airflow vents. Remove the cover and inspect for dust buildup. Replace if necessary, and clean often using an alcohol swab or wipe.

This fan is located underneath the dust filter. The fan itself may be broken or it might not be powered properly. Test by replacing the fan and seeing if the new fan spins. If it does not spin, then a technician may need to check the fan supply voltage.

A “Patient connected” alarmed has appeared on the ventilator display.

If a patient was connected during standby state, then this is simply a user error and can be ignored.

Remove all tube connections from the ventilator. If the alarm is still present, check the exhalation pressure port and valve housing for any irregularities or obstructions.