Automated external defibrillators · AED family

ZOLL AED Plus: troubleshooting and error codes

The ServiceForge knowledge base holds 10 documented symptoms for the ZOLL AED Plus, with 14 ranked causes, 15 diagnostic checks with test points and expected values, and 6 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Status indicator shows red X patient safety

Status indicator LED displays red X instead of normal green check

Ranked causes

1. Electrode cable not properly connected (common)
2. Defective electrodes (common)
3. Internal unit failure (occasional)

First check

Verify electrode cable connection

Test point: Patient cable connector
Expected: Cable properly seated

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Pediatric electrode application incorrect patient safety

Improper placement or application technique of pedi•padz II electrodes may result in poor contact or treatment failure

Ranked causes

1. Patient skin not prepared (wet or clothed) (common)
2. Electrode not properly adhered or air trapped (common)

First check

Verify chest is dry and clear of clothing

Test point: Patient's chest
Expected: All clothing removed, chest surface dry

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit beeps while turned off

Device produces audible beep tone when powered off

Ranked causes

1. Electrode cable disconnected or loose (common)
2. Battery low (occasional)

First check

Verify electrode cable connection

Test point: Patient cable connector
Expected: Cable properly seated

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Electrode adhesion issues during application patient safety

Air bubbles trapped under electrodes or electrodes not properly adhered to patient's skin

Ranked causes

1. Improper electrode placement technique (common)

First check

Patient chest prepared before electrode application

Test point: Patient's chest
Expected: All clothing removed and chest dry

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Indication criteria not met for AED use patient safety

AED Plus applied to patient without confirmed cardiac arrest signs (consciousness, normal breathing, or pulse present)

Ranked causes

1. Patient does not meet all three indication criteria (unknown)

First check

Confirm patient unconsciousness

Test point: Patient responsiveness
Expected: Patient does not respond to voice or physical stimulation

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Pediatric mode not activated patient safety

AED Plus does not automatically switch to pediatric mode or display 'PEDIATRIC PADS' prompt when pedi•padz II electrodes connected

Ranked causes

1. Electrode cable not fully connected (occasional)

First check

Unit mode indication after cable connection

Test point: AED Plus display and speaker
Expected: Display and voice prompt show 'PEDIATRIC PADS'

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit not equipped for pediatric patients patient safety

AED Plus unit without special symbol cannot treat pediatric patients and will not work with pedi•padz II pediatric electrodes

Ranked causes

1. Unit lacks pediatric upgrade (unknown)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit not equipped for pediatric treatment patient safety

AED Plus unit without pediatric symbol will not work with pedi•padz II electrodes and cannot treat pediatric patients

Ranked causes

1. Unit lacking pediatric upgrade (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit switches to incorrect mode for electrode type patient safety

AED Plus may apply wrong cardiac rhythm detection and shock energy selection when adult or pediatric electrodes are connected

Ranked causes

1. Automatic mode switching based on electrode cable type (unknown)

First check

Verify correct mode prompt when connecting electrodes

Test point: Voice and display output
Expected: ADULT PADS (adult electrodes) or PEDIATRIC PADS (pediatric electrodes)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Wrong electrode type for pediatric patient age/weight patient safety

Adult electrodes applied to child under 8 years or weighing less than 55 lbs instead of pediatric electrodes

Ranked causes

1. Pediatric criteria not recognized or assessed (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`ANALYSIS HALTED KEEP PATIENT STILL`	Patient motion detected during ECG analysis	Excessive patient movement detected during rhythm analysis	warning
`CHANGE BATTERIES`	Battery voltage low or depleted	Battery voltage drops below operational threshold	warning
`NO SHOCK DELIVERED (NO TREATMENT DELIVERED)`	Shock or treatment not delivered when button activated	Treatment button pressed but no shock delivered	critical
`PLUG IN CABLE`	Electrode cable not connected or loose	Cable disconnected from patient cable connector	error
`RELEASE SHOCK BUTTON (RELEASE TREATMENT BUTTON)`	Treatment button stuck or held during charging	Treatment button not released during charge cycle	error
`UNIT FAILED`	Self-test failed	Status indicator displays unit failure message	critical

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

Community

0 fixes logged by technicians through their AI, with outcomes, for this model.

ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.