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What This Guide Helps With
Troubleshooting failure to enter Child Mode, recognize pediatric electrodes, display pediatric prompts, or accept compatible pads due to connections, accessories, or controls.
Step-by-Step Troubleshooting
1. Ensure Patient Safety First
Do not perform extended troubleshooting while the AED 3 is the only defibrillator available for an active pediatric emergency.
If pediatric mode or electrode recognition fails during patient care:
- Notify the responding clinical team immediately.
- Obtain another verified AED or defibrillator capable of pediatric therapy.
- Continue CPR and follow the facility’s emergency response procedure.
- Do not delay clinically indicated resuscitation while investigating equipment behavior.
- Remove the affected AED from the rescue once a replacement device is available.
Expected outcome: Patient care no longer depends on an AED with uncertain pediatric energy selection or rhythm-analysis behavior.
Continue Clinical Engineering troubleshooting only after the device is safely removed from patient use.
2. Identify the Exact Failure
Power on the AED and document the observed condition:
- Child button does not illuminate when selected.
- Child Mode will not activate.
- Pedi-padz II are connected, but the AED does not announce or display pediatric-pad recognition.
- The device announces ADULT PADS when pediatric pads are expected.
- The device displays PLUG IN PADS CABLE, ATTACH CORRECT DEFIB PADS, or REPLACE PADS.
- The Child button, screen, or prompts respond intermittently.
The AED 3 uses lower configured energy settings and a pediatric-specific rhythm-analysis algorithm when operating in Child Mode.
Expected outcome: The failure is clearly defined before accessories or the AED are replaced.
3. Confirm Which Electrode Type Is Installed
Inspect the electrode package and part identification.
The AED 3 supports several electrode types, including:
- CPR Uni-padz for adult or pediatric use when Child Mode is manually activated.
- Pedi-padz II for pediatric use.
- CPR-D-padz, CPR Stat-padz, and Stat-padz II for adult use only.
Do not assume that an adult-only pad set will automatically place the AED into pediatric operation.
Expected outcome: A compatible pediatric-capable electrode set is confirmed.
If the wrong electrode type is installed, replace it with the correct compatible set, repeat the operational check, and stop if normal operation returns.
4. Understand the Expected Mode-Selection Behavior
For CPR Uni-padz:
- Pediatric operation is selected by pressing the Child button.
- Reposition the universal electrodes according to the pediatric illustrations on the package.
- Confirm that the Child button illuminates and pediatric graphics or prompts appear.
For Pedi-padz II:
- Connecting the pads should automatically illuminate the Child button.
- The AED should identify the connected electrodes as pediatric pads.
Expected outcome: The AED responds appropriately for the specific electrode type being tested.
5. Inspect the Electrode Package
Verify that the pads are:
- Within their expiration date.
- Unopened and properly sealed.
- Free from cuts, crushing, punctures, moisture intrusion, or contamination.
- Specifically labeled as compatible with the ZOLL AED 3.
- Equipped with an undamaged cable and connector.
Do not use opened, previously applied, expired, or visibly damaged electrodes for a readiness test.
Expected outcome: The electrode set has no visible condition that could prevent correct identification or operation.
If the package is compromised or expired, replace the pads and stop if recognition returns.
6. Check the Pad Cable Connection
Turn the AED off.
Disconnect the electrode connector and inspect:
- The connector body for cracks or deformation.
- Contacts for contamination, moisture, corrosion, or foreign material.
- The cable near the connector for cuts, stretching, or intermittent damage.
- The AED connector receptacle for debris or physical damage.
Reconnect the cable fully and securely without forcing it.
Power on the AED and observe for:
- Child Mode activation.
- PEDIATRIC PADS recognition.
- Absence of PLUG IN PADS CABLE or incompatible-pad messages.
ZOLL directs users to verify that the pad cable is properly connected when the AED issues a pad-cable prompt.
Expected outcome: A loose or incomplete connection is corrected.
If recognition becomes stable, complete the readiness check and stop.
7. Test the Child Button With CPR Uni-padz
With compatible CPR Uni-padz connected and the AED powered on:
- Press the Child button once.
- Confirm that the button illuminates.
- Confirm that the display changes to pediatric placement graphics or instructions.
- Press the button again only as needed to verify repeatable mode switching.
- Check for sticking, contamination, physical damage, or delayed response.
Do not repeatedly press or strike the control.
Expected outcome: Child Mode activates consistently from the front-panel control.
If the button remains physically or electronically unresponsive, remove the AED from service.
8. Substitute a Known-Good Compatible Electrode Set
Install a new, sealed, in-date set of compatible electrodes of the same intended type.
Repeat the test:
- For Pedi-padz II, verify automatic Child button illumination.
- For CPR Uni-padz, verify manual Child Mode selection.
- Confirm that no incompatible-pad, replace-pad, or cable prompt appears.
The AED may issue ATTACH CORRECT DEFIB PADS when connected pads are incompatible and REPLACE PADS when it detects a problem with the electrode set.
Expected outcome: The test determines whether the original electrode package or the AED is responsible.
If the known-good pads work correctly, discard or quarantine the failed electrode set according to facility policy and stop.
9. Power-Cycle and Perform a Self-Test
Turn the AED off, wait briefly, and power it back on.
Where permitted by facility procedure, press and hold the On/Off button for at least five seconds to initiate the self-test and enter management mode.
Verify:
- The AED announces UNIT OK.
- The green readiness check appears.
- No service message is present.
- The pads remain recognized.
- Child Mode still functions correctly after restart.
A blank readiness window indicates that the AED failed its last self-test and is not ready for use.
Expected outcome: The device completes its self-test and retains correct pediatric-mode operation.
If the AED announces UNIT FAILED, lacks the green readiness indicator, or loses recognition again, remove it from service.
10. Perform an Approved Functional Evaluation
Using an approved ZOLL AED simulator or facility-approved test equipment:
- Verify normal power-up.
- Confirm correct pad or simulator recognition.
- Verify reliable Child Mode activation.
- Confirm that pediatric mode remains active during the test.
- Verify that the correct pediatric indications are displayed.
- Do not deliver test energy into actual disposable pads or improvised loads.
Follow only approved performance-verification procedures and test-equipment instructions. Do not open the AED housing or attempt internal control-board or connector repair.
Expected outcome: Pediatric-mode selection and electrode-recognition functions operate consistently under controlled conditions.
If the failure repeats with known-good accessories and approved test equipment, stop troubleshooting.
If the Problem Persists
If compatible, in-date electrodes, cable seating, Child button operation, power cycling, and external functional checks have been verified, the failure is likely associated with the AED connector, control interface, recognition circuitry, software, or another internal condition.
The device should be:
- Removed from service.
- Labeled Out of Service.
- Replaced with another verified AED.
- Sent for authorized repair or bench evaluation.
- Accompanied by the suspect pad set when intermittent recognition may be accessory-related.
ZOLL directs removal from service and contact with Technical Service when pad-cable, incompatible-pad, replacement-pad, or self-test failures persist.
Knowing when to stop is proper troubleshooting. Do not return an AED to service when pediatric energy selection cannot be verified reliably.
Clinical Use Tip
Never troubleshoot pediatric-mode selection during an active rescue when another verified AED is available. Move patient care to the replacement device first, then evaluate the failed unit in a controlled setting.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Clinical staff reported that the ZOLL AED 3 would not enter Child Mode and did not recognize the connected pediatric electrode set."
Cause
What was observed during troubleshooting.
Example:
"Inspection found an intermittent connection at the damaged Pedi-padz II cable near the electrode connector; the AED passed testing with a new compatible pad set."
Resolution
What action was taken.
Example:
"Replaced the defective pediatric electrodes, verified automatic Child Mode activation, completed the AED self-test, and confirmed a green readiness indicator before returning the unit to service."
Helpful Details to Include (If Known)
- Exact electrode type and part number
- Electrode expiration date
- Child button illumination
- Displayed or spoken pad message
- Connector fully seated
- Known-good pads tested
- Physical cable or connector damage
- Self-test result
- Green readiness indicator present
- Simulator or functional-test result
- Final device status
Final Thought
Pediatric-mode failures must be handled conservatively because correct mode selection affects energy delivery and pediatric rhythm analysis. Verify accessories and connections logically, escalate persistent failures, and document the exact findings clearly.
That is successful troubleshooting.