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Manufacturer
Model
What This Guide Helps With
yAlarm: Module Voltage Low causing module failure, loss of monitoring parameters, or intermittent data acquisition due to unstable internal or supply voltage conditions.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Remove the monitor from active patient use if parameters are lost or unreliable
- Transfer monitoring to a backup device
- Ensure continuous patient monitoring is maintained
Verify the Reported Alarm and Behavior
- Confirm the “Module Voltage Low” alarm is displayed
- Power on the monitor and observe when the alarm occurs (startup vs during operation)
- Note which modules are affected (ECG, SpO₂, IBP, etc.)
Check Power Source and External Supply
- Verify the monitor is plugged into a known-good outlet
- Test the outlet using another device
- Remove from power strip or UPS and plug directly into wall outlet
Inspect Power Cord and AC Input Connection
- Check for loose or damaged power cord
- Ensure cord is fully seated in both the outlet and monitor
- Gently move the cord to check for intermittent connection
Check Battery Condition and Operation
- Disconnect AC power and confirm unit runs on battery
- Check for battery alarms or failure indicators
- Reconnect AC and observe charging behavior
Inspect Module Seating and Connections
- Power off the monitor before inspection
- Remove and reseat all parameter modules
- Inspect for bent pins, debris, or poor contact
Remove Non-Essential Modules to Isolate Issue
- Power on monitor with minimal modules installed
- Add modules back one at a time
- Identify if a specific module triggers the alarm
Perform Power Cycle
- Shut down the monitor completely
- Disconnect AC power and remove battery (if applicable)
- Wait 30 seconds and restart the device
If the Problem Persists
If the alarm continues after verifying power source, connections, battery, and module isolation, internal power supply or voltage regulation circuits are likely failing.
- Remove device from service
- Label “Out of Service”
- Send for bench evaluation or repair
Clinical Use Tip
Never troubleshoot on an active patient. Move the patient to a backup monitor before addressing voltage-related alarms to avoid loss of critical monitoring data.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Monitor displaying 'Module Voltage Low' alarm with intermittent loss of patient parameters."
Cause
What was observed during troubleshooting.
Example:
"Voltage instability observed after verifying external power, likely due to faulty module or internal power regulation issue."
Resolution
What action was taken.
Example:
"Removed from service, labeled out of service, and sent for repair and internal evaluation."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
Voltage-related alarms are critical indicators of system instability. Effective troubleshooting requires ruling out external causes quickly and escalating appropriately when internal faults are suspected.
That is successful troubleshooting.