On this page
Asset Type
Manufacturer
Model
What This Guide Helps With
Troubleshooting flow or pressure errors preventing proper channel flushing, often caused by blockages, connection issues, or supply restrictions.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Do not troubleshoot during an active reprocessing cycle with a contaminated scope
- Remove the scope and follow proper infection control procedures
Expected: No patient risk and safe handling of contaminated equipment
Why it matters: Prevents exposure and ensures proper reprocessing workflow
Verify the Reported Error and Behavior
- Confirm the exact error message and when it occurs
- Note if error occurs during fill, rinse, or channel flush phase
- Observe if cycle aborts or continues with alarms
Expected: Clear understanding of when flow/pressure failure occurs
Why it matters: Helps isolate whether issue is supply, connection, or internal restriction
Check Scope Channel Connections (Most Common Cause)
- Verify all channel connectors are attached to correct ports
- Ensure fittings are fully seated and locked
- Confirm correct connector set is used for the specific scope
Expected: Secure, correct connections with no looseness
Why it matters: Misconnections prevent proper flow through channels
Inspect for Kinked or Obstructed Tubing
- Trace all external tubing for kinks or pinches
- Straighten any compressed lines
- Ensure scope is not positioned in a way that restricts flow
Expected: Unrestricted, open tubing path
Why it matters: Even minor kinks can trigger pressure alarms
Check for Channel Blockage in the Scope
- Confirm manual pre-cleaning was completed
- Flush channels manually (if protocol allows)
- Look for resistance when flushing
Expected: Free flow through all channels
Why it matters: Blocked channels will cause pressure buildup or flow failure
Verify Water Supply and Inlet Pressure
- Confirm water supply valve is fully open
- Check facility water pressure is within normal range
- Inspect inlet filters/screens for debris
Expected: Stable and adequate water flow into the unit
Why it matters: Low inlet pressure prevents proper channel flushing
Inspect External Filters and Strainers
- Check and clean inlet strainers if accessible
- Inspect any external filtration system connected to the AER
Expected: Clean filters with unrestricted flow
Why it matters: Partial blockage reduces system flow and increases pressure errors
Check for Air Traps or Improper Loading
- Ensure scope is properly positioned in the basin
- Avoid loops that trap air in channels
- Re-seat the scope and reconnect
Expected: Proper positioning with consistent flow
Why it matters: Air pockets can mimic pressure or flow issues
Restart the Cycle
- Power cycle the unit if needed
- Restart a new cycle with correct setup
Expected: Cycle runs without flow/pressure alarms
Why it matters: Confirms issue was resolved through external correction
If the Problem Persists
If all external causes (connections, tubing, filters, supply, and scope condition) have been ruled out, the issue is likely internal (pump, pressure sensor, or internal flow path restriction).
Remove the device from service, label it Out of Service, and send for repair or bench evaluation.
Knowing when to stop prevents unnecessary risk and wasted troubleshooting time.
Clinical Use Tip
Never troubleshoot flow or pressure issues with a contaminated scope actively connected. Always remove and reprocess safely before testing to avoid cross-contamination.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"AER reporting flow/pressure error during channel flush phase, cycle aborting."
Cause
What was observed during troubleshooting.
Example:
"Kinked scope channel tubing restricting flow and causing pressure alarm."
Resolution
What action was taken.
Example:
"Corrected tubing routing, verified proper connections, and confirmed normal cycle operation."
Helpful Details to Include (If Known)
- Error message text and cycle phase
- Water supply verified
- Tubing inspected for kinks
- Filters checked/cleaned
- Scope pre-cleaning status
- Alarm recurrence after restart
- Final operational status of AER
Final Thought
Flow and pressure errors are most often caused by simple external restrictions or setup issues. A structured approach ensures patient safety, avoids unnecessary downtime, and supports efficient escalation when needed.
That is successful troubleshooting.