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Manufacturer
Model
What This Guide Helps With
Addresses retained chamber fluid, slow draining, or drain alarms caused by external hose restriction, facility drain blockage, positioning, or cycle interruption.
Step-by-Step Troubleshooting
1. Protect Patients and Reprocessing Workflow
Treat any endoscope from an interrupted or incomplete cycle as not fully reprocessed. Quarantine it and transfer reprocessing to another verified AER when available.
Do not open, move, or disconnect the AER while retained fluid could spill or expose personnel to chemicals.
Expected outcome: Staff, endoscopes, and the surrounding area are protected before troubleshooting begins.
2. Confirm the Exact Drain Condition
Record the exact displayed message, cycle phase, chamber involved, and whether fluid remains visibly present. Determine whether the chamber does not drain at all, drains slowly, or drains and then refills.
Check for unusual pump sounds, leakage, odor, or fluid around the base.
Expected outcome: The drain failure is accurately characterized and any immediate leak or chemical-exposure hazard is identified.
3. Check the Facility Drain for Backup
Inspect the accessible drain connection and surrounding area for standing water, slow drainage, or backup from sinks and nearby equipment. Ask whether Facilities or Environmental Services recently reported a blocked drain.
Do not continue cycling the AER into a drain that is backing up.
Expected outcome: The facility drain accepts flow normally. If a building drain obstruction is corrected and the chamber drains normally, troubleshooting can stop after verification.
4. Inspect the External Drain Hose
Inspect the drain hose from the AER to the facility drain. Look for:
- Kinks
- Compression behind cabinets or equipment
- Sharp upward loops
- Improper elevation
- Loose connections
- Cracks or leaks
- A submerged or obstructed hose end
- Incorrect routing after the unit was moved
Correct only accessible external routing problems.
Expected outcome: The drain hose is secure, leak-free, unobstructed, and routed to permit normal drainage.
5. Verify the AER Is Properly Positioned
Check that the unit has not shifted, settled unevenly, or been pushed against the wall in a way that pinches the drain hose. Verify that recent cleaning, construction, or service has not changed the drain connection.
Do not level or reposition the AER beyond facility-approved practices.
Expected outcome: The AER and external drain path are positioned without strain or restriction.
6. Check for Visible Chamber Obstruction
With the AER safe, idle, and handled according to approved procedures, inspect the chamber for visible debris, packaging material, loose labels, or incorrectly placed accessories that may obstruct accessible drain openings.
Do not remove fixed strainers, panels, or internal plumbing components unless the manufacturer procedure specifically authorizes it.
Expected outcome: No visible foreign material or incorrectly positioned accessory is blocking the accessible drainage path.
7. Verify Load and Accessory Placement
Confirm that the endoscope, tubing, connectors, lids, and accessories were placed according to the department’s validated process. Incorrect routing or an item resting over a drain area may interfere with fluid movement.
Correct the setup and keep the original load quarantined until a complete reprocessing cycle is performed.
Expected outcome: The chamber load and accessories do not interfere with drainage.
8. Perform a Safe Restart or Drain Attempt
When chemical exposure risk is controlled and approved procedures allow it, perform the manufacturer-authorized drain, cancel, or restart action. Do not repeatedly command the unit to drain if the fluid level does not change or leakage develops.
Observe the external drain hose and facility drain during the attempt.
Expected outcome: Fluid exits steadily without leakage or backup. If the chamber empties normally and the alarm does not return, proceed to verification.
9. Perform a Controlled Functional Verification
Run the approved empty-cycle or verification process. Confirm that:
- The chamber fills normally
- Fluid circulates as expected
- Drain phases occur without delay
- The chamber empties completely
- No drain alarm or external leak appears
Expected outcome: The complete verification process passes. The issue is resolved, and troubleshooting can stop.
10. Stop and Escalate When Drainage Remains Unreliable
If the external drain, hose routing, chamber condition, and load setup are acceptable but the chamber still will not empty, remove the AER from service. Do not disassemble internal valves, pumps, sensors, or chemical plumbing.
Expected outcome: The AER is prevented from processing endoscopes until reliable drainage is restored.
If the Problem Persists
Common external drain restrictions and setup problems have been ruled out. The remaining cause may involve an internal drain valve, pump, level-sensing system, internal tubing restriction, control fault, or facility drain-capacity problem requiring measured service evaluation.
The AER should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or qualified bench evaluation
- Evaluated using appropriate manufacturer documentation and approved test equipment
- Repaired or configured only by qualified personnel
Return to service requires successful drainage, leak inspection, alarm verification, and completion of the required cycle-performance testing. Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
Do not release an endoscope from any cycle that stopped with fluid remaining in the chamber.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Sterile Processing reported that the Advantage Plus stopped during the drain phase and left water in the chamber."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the external drain hose compressed between the AER and the wall."
Resolution
What action was taken.
Example:
"The hose was repositioned and secured, the chamber was safely drained, and an approved verification cycle completed with normal draining and no leaks."
Helpful Details to Include (If Known)
- Exact drain alarm
- Cycle phase
- Chamber affected
- Amount and type of retained fluid
- Facility drain condition
- Drain-hose routing
- Evidence of backup or leakage
- Load and accessory placement
- Unusual sounds or odor
- Results of controlled drain attempt
- Verification-cycle result
- Final device status
Final Thought
Protect personnel and endoscopes first, verify the complete external drain path before assuming internal failure, confirm reliable emptying through a full test, escalate safely, and record the cause and outcome clearly.
That is successful troubleshooting.