Stretchers · Prime family

Stryker Prime 1115: troubleshooting and error codes

The ServiceForge knowledge base holds 44 documented symptoms for the Stryker Prime 1115, with 80 ranked causes, 115 diagnostic checks with test points and expected values, and 4 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Lift does not operate high voltage

Lift option does not function

Ranked causes

1. Power cord not connected (common)
2. No 120VAC at wall outlet (occasional)
3. Fuse F1, F2 or F3 open (common)
4. Lift switch defective (occasional)
5. Fuse F4 or F5 open (occasional)

First check

Power cord connection

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

Unit does not power on high voltage

No power with or without lift option

Ranked causes

1. Power cord not connected (common)
2. No 120VAC at wall outlet (occasional)
3. Fuse F2 or F3 open (common)
4. Fuses FH1 or FH2 open on DC board (occasional)
5. Fuses FH3 or FH4 open on DC board (occasional)

First check

Power cord connection

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

No lift (lift option) caution

Lift mechanism does not operate when activated

Ranked causes

1. Power supply failure to lift system (common)
2. Lift control fuses blown (common)
3. Lift switch defective or not activated (occasional)
4. Pump motor fuses blown (occasional)

First check

Verify power connections to lift control board

Test point: Power cord, wall outlet, J1 on lift control board
Expected: 120VAC at J1
Tools: Multimeter

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

No power (with or without lift option) caution

Unit has no electrical power output

Ranked causes

1. Power cord not connected (common)
2. No 120VAC from wall outlet (common)
3. Failed fuses in power chain (common)
4. Failed fuses in DC control circuit (occasional)

First check

Verify power cord firmly connected at wall outlet and unit

Test point: Power cord connector
Expected: Secure connection
Tools: Visual inspection

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

Fowler (backrest) does not move down

Backrest fails to lower when down control activated

Ranked causes

1. Patient controls lock engaged (common)
2. Loss of 35VDC power (occasional)
3. Loss of 12VDC down control signal (occasional)

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

Fowler (backrest) does not move up

Backrest fails to raise when up control activated

Ranked causes

1. Patient controls lock engaged (common)
2. Loss of 35VDC power to fowler motor (occasional)
3. Loss of 12VDC control signal (occasional)

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

Gatch (knee break) does not move down

Knee section fails to lower when down control activated

Ranked causes

1. Patient controls lock engaged (common)
2. Loss of 35VDC power (occasional)
3. Loss of 12VDC gatch down control signal (occasional)

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

Gatch (knee break) does not move up

Knee section fails to raise when up control activated

Ranked causes

1. Patient controls lock engaged (common)
2. Loss of 35VDC gatch motor power (occasional)
3. Loss of 12VDC gatch up control signal (occasional)

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

No electrical power to stretcher litter caution

Electric litter option receives no AC power from base station (electric litter option)

Ranked causes

1. Loss of 120VAC input power from base (common)
2. Blown fuse in power distribution (common)
3. Loss of 36VDC or 18VDC internal supply voltage (occasional)

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

Chaperone function not detecting patient exit attempt patient safety

Zone 1 or Zone 2 armed but alert does not sound when patient attempts to exit stretcher

Ranked causes

1. Scale system not properly zeroed before patient positioned (common)
2. Chaperone function not armed (common)

First check

Verify scale system is zeroed with '000.0' solid display

Test point: Display
Expected: Solid '000.0' (not flashing)

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

Load cell reading out of range

Scale diagnostic mode shows load cell reading drastically outside 15-45 lb range for empty stretcher; indicates load cell problem

Ranked causes

1. Load cell cable disconnected or damaged (common)
2. Defective load cell sensor (occasional)

First check

Enter diagnostic mode and select individual load cell reading

Test point: Diagnostic display for head/right, head/left, foot/right, or foot/left
Expected: 15-45 lb for empty stretcher

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

No fowler down caution

Fowler (backrest) does not lower when control activated

Ranked causes

1. Patient controls locked (common)
2. No power to fowler circuit (occasional)

First check

Verify patient control lock status

Test point: Control lock indicator on stretcher
Expected: Lock indicator is green (unlocked)
Tools: Visual inspection

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

No fowler up caution

Fowler (backrest) does not rise when control activated

Ranked causes

1. Patient controls locked (common)
2. No power to fowler circuit (occasional)

First check

Verify patient control lock status

Test point: Control lock indicator on stretcher
Expected: Lock indicator is green (unlocked)
Tools: Visual inspection

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

No gatch down caution

Leg rest (gatch) does not lower when control activated

Ranked causes

1. Patient controls locked (common)
2. No power to gatch circuit (occasional)

First check

Verify patient control lock status

Test point: Control lock indicator on stretcher
Expected: Lock indicator is green (unlocked)
Tools: Visual inspection

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

No gatch up caution

Leg rest (gatch) does not rise when control activated

Ranked causes

1. Patient controls locked (common)
2. No power to gatch circuit (occasional)

First check

Verify patient control lock status

Test point: Control lock indicator on stretcher
Expected: Lock indicator is green (unlocked)
Tools: Visual inspection

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

No litter power (electric litter option) caution

Electric litter option does not have electrical power

Ranked causes

1. No AC power input to DC control board (common)
2. High voltage fuses blown (common)

First check

Measure AC input voltage to litter power circuit

Test point: J8 (C) on DC control board
Expected: 120VAC
Tools: Multimeter

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

Patient control lockout will not engage caution

Electric litter lockout feature fails to secure patient controls (electric litter option)

Ranked causes

1. Loss of 12VDC lockout power (common)
2. Loss of 12VDC control signal (occasional)

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

Scale or exit does not have power (electric litter option) caution

Scale or exit subsystem does not have electrical power

Ranked causes

1. No power from DC control board to scale board (common)
2. Scale control board fuse blown (common)

First check

Measure power input to scale control board from DC control board

Test point: J5 (L) on scale control board
Expected: 20VDC
Tools: Multimeter

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

Scale system measurement inaccuracy

Weight readings do not meet stated accuracy specification

Ranked causes

1. Stretcher not in flat position (common)
2. Stretcher tilted beyond 5 degrees Trendelenburg/reverse Trendelenburg (occasional)

First check

Verify fowler and gatch position

Test point: Stretcher surface
Expected: Flat position

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

Stretcher height does not lower patient safety

Hydraulic lower function does not work; stretcher remains at raised height

Ranked causes

1. Hydraulic lower pedal not fully depressed (common)
2. Hydraulic system failure (rare)

First check

Depress lower pedal (B) center

Test point: Pedal (B) center
Expected: Both ends of litter lower smoothly and together

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

Stretcher height does not raise caution

Hydraulic lift system fails to elevate litter surface

Ranked causes

1. Obstructions blocking hydraulic raise (occasional)
2. Hydraulic system malfunction (rare)

First check

Verify area is clear of obstructions

Test point: Space around and under stretcher
Expected: No equipment or obstacles present

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

Battery voltage low

Display shows Lo batt and battery icon flashes when voltage drops below threshold. Scale may not function reliably.

Ranked causes

1. Battery voltage below 5.1 V (common)

First check

Check battery voltage

Test point: Battery voltage (batt function in diagnostics)
Expected: 5.1 V or higher, ≥5.1 V

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

Lift raises very slowly high voltage

Lift operates at slower than normal speed

Ranked causes

1. Defective capacitor circuit (rare)

First check

Capacitor circuit voltage when pump pedal depressed

Test point: J3 (C) pins 2, 3, 5
Expected: 160VAC between pin 2 and pin 3, and 160VAC between pin 2 and pin 5
Tools: DMM

Lift raises very slowly (lift option) caution

Lift mechanism operates but at reduced speed

Ranked causes

1. Capacitor circuit malfunction in lift system (common)

First check

Measure capacitor circuit voltage (between black and red wires)

Test point: J3 (C) pin 2 (black) and pin 3 (red) on lift control board
Expected: 160VAC when pump pedal depressed
Tools: Multimeter

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

Lock out for patient controls will not lock out (electric litter option) caution

Patient control lock function does not engage

Ranked causes

1. No power to lock-out circuit (common)

First check

Measure static lock-out circuit voltage

Test point: J9 (K) pin 2 (red/positive) and pin 1 (black/negative) on DC control board
Expected: 12VDC
Tools: Multimeter

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

Low battery voltage

Scale diagnostic displays 'Lo batt'; battery icon flashing; voltage reading below 5.1 V

Ranked causes

1. Battery voltage depleted below 5.1 V (common)

First check

Enter diagnostic mode and toggle to batt function

Test point: Battery voltage display (batt field)
Expected: 5.1 V or higher

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

Pump motor replacement high voltage

Optional electric lift pump motor requires service replacement

Ranked causes

1. Pump motor failure or wear (unknown)

First check

Pump stretcher to fully raised position

Test point: Pump controls
Expected: Stretcher at maximum height

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

Scale reading inaccurate

Scale does not display correct weight when known weights are placed on litter. Calibration may be needed or scale may require adjustment.

Ranked causes

1. Scale not calibrated or calibration lost (common)

First check

Place known weight on stretcher

Test point: Scale display
Expected: Displays weight accurately matching placed weight

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

Scale requires calibration

Scale weight readings inaccurate or need verification against known weights

Ranked causes

1. Scale drift or calibration lost (occasional)

First check

Remove all non-permanent items from stretcher

Test point: Stretcher surface
Expected: Only mattress and permanent items remain

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

Scale system battery low

Display shows 'Lo batt' and battery icon flashing; battery voltage below 5.1 V

Ranked causes

1. Battery voltage below minimum threshold (common)

First check

Check battery voltage in diagnostic mode

Test point: Diagnostic mode, batt function
Expected: 5.1 V or higher, ≥5.1 V

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

Scale system cannot obtain stable weight or zero measurement patient safety

Display shows error or does not stabilize when patient is moving during weighing or zeroing operation

Ranked causes

1. Patient movement during weighing or zeroing (common)

First check

Verify patient is stationary and stretcher is not being touched

Test point: Patient position and stretcher movement
Expected: Patient still, stretcher not moving

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

Scale system cannot reach stable weight reading

System unable to obtain stable weight measurement within 20 seconds, error message displayed

Ranked causes

1. Patient movement during measurement (common)

First check

Verify patient position and stability

Test point: Patient on stretcher
Expected: Patient remains motionless for duration of measurement

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

Scale system display shows 'Lo batt'

Display flashing 'Lo batt' message, scale system disabled due to drained batteries

Ranked causes

1. AA batteries completely drained (non-electric litter option) (common)

First check

Check display for 'Lo batt' message

Test point: Display
Expected: 'Lo batt' flashing

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

Scale system display shows single charge indicator bar

One of the charge indicator bars on the display is black, indicating low battery or power level

Ranked causes

1. AA batteries (non-electric litter) or Li-Ion battery pack (electric litter) depleted (common)

First check

Observe charge indicator bars on display

Test point: Display (1)
Expected: Only one charge indicator bar is black

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

Scale system display shuts off unexpectedly

Display turns off after approximately 40 seconds during measurement or zeroing procedure

Ranked causes

1. Normal automatic shutdown after timeout period (common)

First check

Verify timeout period has elapsed

Test point: Display status
Expected: Display off after 40 seconds of inactivity

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

Scale system displays 'Err'

Display shows 'Err' error message indicating loose connection or malfunctioning component

Ranked causes

1. Loose connection or malfunctioning component in scale system (unknown)

First check

Attempt the scale function that triggered 'Err' message

Test point: Display
Expected: Function completes without 'Err' message

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

Scale system displays error

Display shows 'Err' message instead of weight measurement or system status

Ranked causes

1. Loose connection or malfunctioning component (unknown)

First check

Retry the weighing function

Test point: Scale display
Expected: Good or weight value displayed

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

Scale system load cell reading abnormal

Individual load cell displays drastically outside typical 15-45 lb range for empty stretcher; may show 'Test' then 'Err'

Ranked causes

1. Load cell cable disconnected or damaged (common)

First check

Display individual load cell readings

Test point: Diagnostic mode, hr/hl/fr/fl functions
Expected: 15-45 lb per load cell for empty stretcher

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

Scale system zero operation displays flashing hold message

Display shows flashing hold message during zeroing procedure

Ranked causes

1. Normal zero operation in progress requiring extended hold (common)

First check

Monitor display during zero operation

Test point: Scale display
Expected: Display transitions from hold to rel to solid 000.0

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

Stretcher does not maintain brake position patient safety

Casters unlock or brakes do not hold; stretcher rolls when parked with brakes engaged

Ranked causes

1. Brakes not fully engaged (common)

First check

Verify all four casters are locked

Test point: All four wheels
Expected: All four casters locked and stretcher does not move when pushed

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

Stretcher height unstable when patient is on foot end patient safety

Litter surface tips or shifts when patient sits on ends of stretcher

Ranked causes

1. Patient seated on stretcher ends instead of center (occasional)

First check

Observe patient position on stretcher

Test point: Patient location on litter surface
Expected: Patient centered on litter, not on ends

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

Stretcher left unattended at raised height patient safety

Risk of patient fall or injury when stretcher is at raised height without attendant

Ranked causes

1. Operator procedure not followed (occasional)

First check

Verify stretcher at lowest position

Test point: Stretcher height
Expected: Stretcher fully lowered to lowest position

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

Weighing accuracy not meeting specification patient safety

Scale readings appear incorrect or accuracy does not match product specification

Ranked causes

1. Patient surface not in flat position or stretcher inclined beyond tolerance (common)

First check

Verify patient surface position is flat

Test point: Fowler and gatch controls
Expected: Both controls down, patient surface flat

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

Zero scale system display flashing 'hold'

Display flashes 'hold' when attempting to zero scale system; cannot proceed to zero state

Ranked causes

1. Normal zero procedure requiring extended button hold (common)

First check

Display shows 'hold' when Zero button pressed

Test point: Display
Expected: 'hold' message displays

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

Error codes

Code	Meaning	Trigger	Severity
`EEP-Err`	Memory Corruption Error	Scale memory corruption detected	error
`Err`	Loose connection or malfunctioning component detected	Scale system hardware or connection fault during operation	error
`Err-LC`	Load Cell Error	Load cell detects error condition	error
`Lo batt`	Batteries or battery pack depleted	Battery voltage drops below operating threshold	warning

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.