CT injector systems · Stellant family

Medrad Stellant: troubleshooting and error codes

The ServiceForge knowledge base holds 44 documented symptoms for the Medrad Stellant, with 64 ranked causes, 56 diagnostic checks with test points and expected values, and 41 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Docking sensor A error (DOCK SENSA prefix) patient safety

System has detected Piston A docking sensor closed with no syringe attached on side A

Ranked causes

1. Syringe not installed correctly (common)
2. Dirty syringe interface area (common)
3. Faulty size Sensor A (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Docking sensor B error (DOCK SENSB prefix) patient safety

System has detected Piston B docking sensor closed with no syringe attached on side B

Ranked causes

1. Syringe not installed correctly (common)
2. Dirty syringe interface area (common)
3. Faulty size Sensor B (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Encoder A error (ENCA prefix)

System has found problem with Encoder on motor A or associated circuitry

Ranked causes

1. P4 connector not connected (common)
2. Faulty Power Drive card (occasional)
3. Faulty motor A (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Encoder B error (ENCB prefix)

System has found problem with Encoder on motor B or associated circuitry (Dual only)

Ranked causes

1. P4 connector not connected correctly (common)
2. Faulty Power Drive card (occasional)
3. Faulty motor B (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Injector not ready for scanning patient safety

Injector icon not flashing and highlighted in yellow, indicating system is not ready to execute imaging procedure.

Ranked causes

1. Protocol not locked before arming (common)
2. Air present in fluid pathway (common)
3. Injector not armed (common)

First check

Verify Protocol Lock button has been pressed

Test point: Protocol Lock icon in lower left corner of screen
Expected: Icon highlighted in yellow

2 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

System unable to arm or injection interrupted patient safety

Injection system fails to arm or stops during injection; error codes displayed on control panel

Ranked causes

1. Operator-induced condition (common)
2. System malfunction (occasional)
3. Voltage transient or noisy electrical environment (occasional)

First check

Perform power reset

Test point: Power cord and power source
Expected: System resets after one minute power removal and reapplication

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

White screen displaying MEDRAD

Display shows white screen with MEDRAD text, indicates communication or software problem

Ranked causes

1. Software mismatched between Display and Head (common)
2. Faulty Head extension cable (occasional)
3. Faulty Servo/CPU card (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

White screen with MEDRAD displayed

Display shows white screen with MEDRAD text, indicates communication or software problem

Ranked causes

1. Software mismatched between Display and Head (unknown)
2. Faulty Head extension cable (unknown)
3. Servo/CPU card failure (unknown)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration error (CAL prefix)

System has found error with system calibration values missing or corrupt

Ranked causes

1. Calibration values missing or corrupt (common)
2. Faulty Servo/CPU card (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Heat maintainer not warm or fault indicator illuminated caution

Heat maintainer does not reach operating temperature or fault indicator light is on while attached to head

Ranked causes

1. Heat maintainer heater element failure (occasional)
2. Heat maintainer fault sensor triggered (occasional)

First check

Touch heat maintainer while attached to head

Test point: Heat maintainer surface
Expected: Heat maintainer is warm

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

Piston does not auto-dock with syringe plunger caution

Piston fails to automatically dock and advance to full forward position when empty syringe is installed

Ranked causes

1. Auto Dock setting disabled or malfunctioning (occasional)
2. Syringe not seated properly (occasional)

First check

Install empty syringe in holder

Test point: Syringe seat on injector head
Expected: Syringe fully seated

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

Piston forward/reverse not responding patient safety

Pistons do not advance or retract when forward/reverse controls are activated

Ranked causes

1. Motor or drive mechanism failure, or ENABLE key not pressed (common)
2. One piston not responding while other piston functions normally (occasional)

First check

Press ENABLE key and verify it activates control mode

Test point: ENABLE key
Expected: ENABLE key activates when pressed

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

Arm lights not functioning caution

Indicator lights on injector head do not illuminate during operation

Ranked causes

1. LED bulb failure or electrical connection issue (occasional)

First check

Verify arm lights illuminate on injector head

Test point: Injector head arm lights
Expected: Lights illuminate when powered

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

Arm lights on injector head not functioning caution

Indicator lights on the injector head arm do not illuminate

Ranked causes

1. LED or light circuit failure (unknown)

First check

Observe arm lights on injector head

Test point: Injector head arm light indicators
Expected: Lights illuminate during operation

Audible tones not functioning caution

Display Control Unit or injector head does not emit audible tones during operation or diagnostics

Ranked causes

1. Speaker or audio amplifier malfunction (rare)

First check

Listen for audible tones from Display Control Unit and injector head

Test point: Display Control Unit and injector head speakers
Expected: Audible tones present during operation and diagnostics

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

Auto Advance not enabled caution

Auto Advance feature is disabled when it should be enabled

Ranked causes

1. Auto Advance setting disabled in system configuration (unknown)

First check

Verify Auto Advance setting is enabled

Test point: System settings menu
Expected: Auto Advance enabled

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

Auto Dock not enabled caution

Auto Dock feature is disabled when it should be enabled for automatic piston docking

Ranked causes

1. Auto Dock setting disabled in system configuration (unknown)

First check

Verify Auto Dock setting is enabled

Test point: System settings menu
Expected: Auto Dock enabled

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

Auto functions disabled or not responding patient safety

Auto Dock, Auto Advance, or Auto Retract functions are not enabled or do not activate

Ranked causes

1. Auto function settings not enabled in system configuration (common)

First check

Verify Auto Dock function is enabled

Test point: Auto Dock setting in main menu
Expected: Auto Dock is enabled

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

Auto Retract not enabled caution

Auto Retract feature is disabled when it should be enabled

Ranked causes

1. Auto Retract setting disabled in system configuration (unknown)

First check

Verify Auto Retract setting is enabled

Test point: System settings menu
Expected: Auto Retract enabled

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

Component corrosion or damage from water exposure caution

Excessive water or cleaning solution contact causing component damage or corrosion

Ranked causes

1. Excessive water or cleaning solution exposure (occasional)

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

Control button malfunction patient safety

Forward, Reverse, Start, Stop, or Fill buttons do not respond to user input

Ranked causes

1. Button switch failure or electrical disconnect (occasional)

First check

Test Forward and Reverse buttons

Test point: Forward/Reverse button
Expected: Button responds and injector advances/retracts

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

Controls not responding (Forward, Reverse, Start, Stop, Fill) caution

One or more system controls do not function when operated during checkout

Ranked causes

1. Control input not registering (unknown)

First check

Test Forward control functionality

Test point: Forward button/control
Expected: System advances forward

4 more checks with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Display brightness cannot be adjusted caution

Display brightness controls (up/down keys) do not brighten or darken screen

Ranked causes

1. Brightness control button failure or backlight circuit malfunction (occasional)

First check

Press Display Brightness Up key multiple times

Test point: Brightness Up key on rear of Display
Expected: Screen brightness increases to fullest extent

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

Display Brightness controls not responding caution

Display Brightness Up or Down keys do not adjust screen brightness

Ranked causes

1. Brightness control circuit malfunction (unknown)

First check

Press Display Brightness Up key and observe screen

Test point: Display Control Unit brightness up button
Expected: Screen brightens to fullest extent

1 more check with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Electrical fire hazard from incorrect fuse high voltage

Incorrect fuse type installed, creating fire risk

Ranked causes

1. Incorrect fuse type installed (occasional)

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

Electrical shock from worn or damaged cabling high voltage

Worn, damaged, or exposed cables create shock hazard during operation or service

Ranked causes

1. Worn or damaged cables (occasional)

First check

Visually inspect all cabling for wear or damage

Test point: All cables connected to ISI 800 Module
Expected: No visible wear, cracks, or damage

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

Explosion hazard from flammable presence patient safety

Use of injection system in environment with flammable anesthetics or other flammables

Ranked causes

1. Flammables present in area (anesthetics, etc.) (occasional)

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

Injection does not complete normally or HOLD feature fails caution

Injection sequence does not finish as programmed or HOLD feature does not activate for specified duration

Ranked causes

1. Injection control software or motor drive malfunction (unknown)

First check

Arm system in single mode with empty syringe

Test point: System mode setting
Expected: System in single mode

3 more checks with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Injection stops due to scanner communication loss patient safety

Injection halts or does not complete normally when communication link between scanner and injector fails during coupled operation.

Ranked causes

1. Communication link failure between scanner and injector (occasional)

First check

Monitor communication during injection

Test point: ISI Communication icon at bottom left of Monitor
Expected: Icon remains highlighted with yellow background throughout injection

Injector fails to arm or disarms unexpectedly patient safety

Injector cannot be armed or automatically disarms during operation when ISI 800 Module is configured.

Ranked causes

1. ISI 800 Module communication failure with scanner (common)

First check

Verify ISI Communication icon status

Test point: ISI Communication icon at bottom left of Monitor
Expected: Icon highlighted with yellow background or no communication problem indicated

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

Patient injury from improper accessories patient safety

Use of non-approved accessories or options incompatible with ISI 800 Module

Ranked causes

1. Use of non-approved accessories or options (occasional)

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

Piston does not advance to full forward position after injection caution

Piston fails to fully advance forward position after injection sequence completes

Ranked causes

1. Piston motor or drive circuit malfunction (unknown)

First check

Command piston to full forward position

Test point: Piston position indicator
Expected: Piston advances to full forward position

Piston does not auto-retract after syringe removal caution

Piston fails to automatically retract after syringe is removed and advance is complete

Ranked causes

1. Auto Retract setting disabled or malfunctioning (occasional)

First check

Remove syringe after piston reaches full forward position

Test point: Piston position / Auto Retract mechanism
Expected: Piston automatically retracts after syringe removal

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

Piston does not fully retract caution

Piston fails to return to full reverse position when controlled manually

Ranked causes

1. Piston drive motor or mechanical binding (unknown)

First check

Manually command piston to full reverse position

Test point: Piston position indicator
Expected: Piston reaches full reverse position

Pistons do not respond to forward/reverse controls caution

One or both pistons fail to advance or retract when control buttons are pressed

Ranked causes

1. Piston motor or control circuit failure (unknown)

First check

Activate ENABLE key

Test point: ENABLE key on Display Control Unit
Expected: Piston motors enabled

2 more checks with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Safety screen does not display after power-up caution

System powers on but Safety screen does not appear after diagnostics complete

Ranked causes

1. Diagnostics did not complete properly (unknown)

First check

Verify Safety screen displays after system diagnostics

Test point: Display screen
Expected: Safety screen appears after diagnostics complete

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

System damage from incorrect voltage supply caution

Unit connected to outlet with voltage or frequency that does not match system nameplate rating

Ranked causes

1. Voltage or frequency mismatch with outlet (occasional)

First check

Verify voltage and frequency match nameplate rating

Test point: Serial tag on back of unit and electrical outlet
Expected: Voltage and frequency on serial tag match outlet specification

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

System does not power up properly patient safety

Safety screen not displayed after system diagnostics, or system fails to respond to controls after power-up

Ranked causes

1. System diagnostics failure or initialization incomplete (unknown)

First check

Verify Safety screen appears after power-up diagnostics

Test point: Display Control Unit screen
Expected: Safety screen displayed after system diagnostics

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

System labels missing or illegible patient safety

Safety and warning labels on the system are not present or cannot be read clearly

Ranked causes

1. Labels damaged, faded, or removed (unknown)

First check

Visually inspect all system safety and warning labels

Test point: All visible areas of injector head and Display Control Unit
Expected: All labels present and legible

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

System malfunction during operation patient safety

System does not operate correctly or displays uncorrectable fault message

Ranked causes

1. System malfunction (unknown)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

System malfunction from missed preventive maintenance patient safety

System not calibrated or functioning properly due to lack of regular maintenance

Ranked causes

1. Failure to perform regular preventive maintenance (occasional)

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

System malfunction occurs during patient injection patient safety

System malfunction message appears on display during or after patient injection procedure

Ranked causes

1. Electrical or mechanical failure within injector (unknown)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Type 3 system malfunction message displayed patient safety

System displays Type 3 malfunction message requiring power removal. Message may recur if underlying condition not corrected. Code number shown in lower left corner of dialog box.

Ranked causes

1. Unknown system malfunction requiring diagnostic action (unknown)

First check

Immediately remove system from patient

Test point: System connection to patient
Expected: System disconnected from patient

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

Unit fails after installation patient safety

ISI 800 Module may not function properly if installation is incorrect

Ranked causes

1. Improper installation by untrained personnel (common)

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

Error codes

Code	Meaning	Trigger	Severity
`CAL`	Calibration error	System found error with calibration values missing or corrupt	error
`CAL`	Calibration error with missing or corrupt system calibration values	System detects missing or corrupt calibration values	error
`DOCK SENSA`	Docking sensor A error	Piston A docking sensor closed with no syringe attached on side A	warning
`DOCK SENSA`	Piston A docking sensor closed with no syringe attached	Docking sensor A detects closed state without syringe	error
`DOCK SENSB`	Docking sensor B error	Piston B docking sensor closed with no syringe attached on side B	warning
`DOCK SENSB`	Piston B docking sensor closed with no syringe attached	Docking sensor B detects closed state without syringe	error
`ENCA`	Encoder A error	Problem with Encoder on motor A or associated circuitry	error
`ENCA`	Encoder A problem on motor A or associated circuitry	Error detected during encoder or motor A circuit test	error
`ENCB`	Encoder B error	Problem with Encoder on motor B or associated circuitry	error
`ENCB`	Encoder B problem on motor B or associated circuitry (Dual only)	Error detected during encoder or motor B circuit test	error
`FRA`	Flex Ring problem on side A	Error detected in Flex Ring A system	error
`FRB`	Flex Ring problem on side B	Error detected in Flex Ring B system	error
`HOVER`	Head or DCU overlay switch card problem	Error detected in head, switch card or associated circuitry during diagnostics	error
`HSW`	Handswitch problem or associated circuitry failure	Error detected in handswitch system	error
`HUB`	Ethernet HUB problem or associated circuitry failure	Error detected in Ethernet HUB or circuit	error
`ICD`	Display Interface Card problem or associated circuitry failure	Error detected in Display Interface Card or circuit	error
`ICE`	Expansion Base Interface Card problem or associated circuitry failure	Error detected in Base Interface Card or circuit	error
`ICS`	Head Interface Card problem or associated circuitry failure	Error detected in Head Interface Card(s) or circuit	error
`MOTA`	Motor A problem or associated circuitry during H Bridge test	Error detected during motor A or H Bridge circuit test	error
`MOTB`	Motor B problem or associated circuitry during H Bridge test (Dual only)	Error detected during motor B or H Bridge circuit test	error
`PCMCIA`	PCMCIA card problem or associated circuitry failure	Error detected in PCMCIA card or circuit	warning
`POTA`	Potentiometer A problem or associated circuitry failure	Error detected in potentiometer A or circuit during test	error
`POTB`	Potentiometer B problem or associated circuitry failure (Dual only)	Error detected in potentiometer B or circuit during test	error
`POWR`	Power Drive Card problem or associated circuitry failure	Error detected in power card or circuit	error
`PRSSRA`	Pressure Transducer A problem or associated circuitry failure	Error detected in pressure transducer A or circuit	error
`PRSSRB`	Pressure Transducer B problem or associated circuitry failure (Dual only)	Error detected in pressure transducer B or circuit	error
`RATE`	Over rate injection condition detected	System detects injection rate exceeds limits	error
`SBC`	Single Board Computer problem or associated circuitry failure	Error detected in SBC or circuit	error
`SER`	Servo/CPU Card problem, may be electrical transient or hardware failure	Error detected in Servo/CPU card or Head card	error
`SSD`	Start Switch (Display) problem or connection failure	Error detected in Display start switch or circuit	error
`SSH`	Start Switch (Head) problem or connection failure	Error detected in Head start switch or circuit	error
`SW`	Internal software problem, may be electrical transient or corruption	Software error detected during operation or self-test	error
`SWMTCH`	Software mismatch between Head and Display	Software version mismatch detected between Head and Display CPUs	error
`SWSBC`	CPU software problem on display CPU card	Software error detected on display CPU card	error
`SWSER`	Servo software problem on Head CPU card	Software error detected on Head CPU card	error
`SYR SENA`	Size Sensor A problem or associated circuitry failure	Error detected in syringe size sensor on A side or circuit	error
`SYR SENB`	Size Sensor B problem or associated circuitry failure (Dual only)	Error detected in syringe size sensor on B side or circuit	error
`TCHSCR`	Touch screen problem or associated circuitry failure	Error detected in touch screen or circuit during diagnostics	error
`Type 3`	System malfunction message requiring power removal	Various system malfunctions depending on error category and subcategory	critical
`UOM`	Unintended opposite motion, DSP routing timeout	DSP software routine did not report within allowed time	error
`VOL`	Over volume injection condition detected	System detects injection volume exceeds limits	error

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.