On this page
Asset Type
Manufacturer
Model
What This Guide Helps With
This guide addresses the Relay #1 Failure alarm, which causes the sterilizer to abort a cycle due to failure of the switched neutral relay controlling door seals and chamber float switch functions. This impacts proper sealing, water level detection, and safe operation.
Step-by-Step Troubleshooting
1. Ensure Patient Safety First
- Remove the sterilizer from service immediately if the alarm occurs during a cycle
- Do not use any instruments from the aborted cycle
- Transfer workload to another sterilizer
2. Verify the Reported Alarm and Behavior
- Confirm the display shows “Relay #1 Failure”
- Observe if the alarm occurs at startup or during a cycle
- Check if the cycle aborts automatically
- Look for abnormal door seal or chamber behavior
3. Check Power Supply Stability
- Verify the unit is connected to a stable power source
- Check for recent power interruptions or fluctuations
- Confirm outlet voltage is within expected range if possible
4. Inspect Door Seal Operation (External Check)
- Observe door seal A and B during operation
- Check if seals inflate properly
- Listen for air or steam leaks
5. Check Chamber Float Switch Behavior
- Observe for abnormal water level readings
- Check for unexpected alarms related to chamber level
- Verify normal fill and drain behavior
6. Inspect External Connections and Wiring (Non-Invasive)
- Power down the unit before inspection
- Check accessible control cabinet connections
- Inspect visible harness connections
- Look for loose connectors or heat damage
7. Power Cycle the Unit
- Turn the unit OFF and wait 30–60 seconds
- Restore power and restart the sterilizer
- Attempt a test cycle if safe to do so
8. Stop if Resolved
- If the alarm does not return and a cycle completes successfully, return the unit to service
- Continue to monitor for recurrence
If the Problem Persists
If the Relay #1 Failure alarm continues after external checks:
- External causes have been ruled out
- The issue likely involves a failed relay, control board failure, or internal wiring fault
- Remove the unit from service
- Label the device Out of Service
- Send for qualified repair or bench evaluation
Clinical Use Tip
Never troubleshoot relay or control-related alarms on an active patient load. Always move the workload to a backup sterilizer before continuing evaluation.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Unit displayed ‘Relay #1 Failure’ alarm and aborted cycle during operation."
Cause
What was observed during troubleshooting.
Example:
"Suspected internal relay or control circuit failure after external power and connection checks were verified normal."
Resolution
What action was taken.
Example:
"Removed sterilizer from service, labeled Out of Service, and referred for further repair and diagnostic evaluation."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
Relay-related alarms indicate loss of critical control functions tied to sealing and safety systems. Focus on external verification first, but escalate quickly when control faults persist.
That is successful troubleshooting.