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Hospital beds

Stryker Renaissance 2020: troubleshooting and error codes

The ServiceForge knowledge base holds 34 documented symptoms for the Stryker Renaissance 2020, with 70 ranked causes, 20 diagnostic checks with test points and expected values, and 0 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Litter drifts after raised or lowered

Hydraulic litter drifts or continues to move after foot pedals are released

Ranked causes

  1. 1. Air in hydraulic system (common)
  2. 2. Valve control linkage misalignment (common)
  3. 3. Leaking hoses or fittings (occasional)
  4. 4. Faulty jack (occasional)
  5. 5. Faulty check valve (rare)
  6. 6. Faulty main valve (rare)

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

Litter will not lift electrically with no motor sounds patient safety

No audible motor activity when attempting to lift; bed mattress platform cannot be raised

Ranked causes

  1. 1. Lift motor failure (common)
  2. 2. Motor capacitor connection failure (occasional)
  3. 3. Motor capacitor failure (occasional)
  4. 4. Voltage not reaching motors or boards (rare)

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

Litter will not lower electrically patient safety

Bed mattress platform cannot be lowered using electric solenoid valves

Ranked causes

  1. 1. Blown fuse #3 at power board (common)
  2. 2. Insufficient voltage at solenoid valves (occasional)
  3. 3. Control switch board malfunction (occasional)
  4. 4. Insufficient voltage to boards (rare)
First check

Measure voltage at solenoid terminals

Test point
Solenoid valve terminals on junction board
Expected
99 V(AC) minimum, >= 99 V
Tools
Multimeter

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

Weigh system not accurate

Weight measurement system provides inaccurate or unreliable measurements

Ranked causes

  1. 1. Physical binding on litter top (common)
  2. 2. Load cell malfunction (occasional)
  3. 3. Load cell calibration drift (occasional)
  4. 4. Scale CPU board failure (occasional)

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

Bed unresponsive to foot end keypad patient safety

Foot positioning commands not executed; other keypads respond normally

Ranked causes

  1. 1. Foot end switch board defect (common)
  2. 2. Foot end keypad cable disconnection (occasional)
  3. 3. Litter control board malfunction (occasional)

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

Bed unresponsive to head end keypad patient safety

Head positioning commands not executed; other keypads respond normally

Ranked causes

  1. 1. Head end switch board defect (common)
  2. 2. Head end keypad cable disconnection (occasional)
  3. 3. Litter control board malfunction (occasional)

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

Bed unresponsive to patient controls patient safety

Patient control commands not executed; other keypads respond normally

Ranked causes

  1. 1. Patient control disconnection or cable fault (common)
  2. 2. Patient control or cable malfunction (occasional)
  3. 3. Litter control board malfunction (occasional)

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

Isolated problem with Knee Gatch or Fowler motor movement patient safety

Single positioning function (Knee Gatch or Fowler) not responding to commands

Ranked causes

  1. 1. Blown fuse #2 at power board (common)
  2. 2. Motor or connector issue (identify via isolation) (occasional)
  3. 3. Power board malfunction affecting that motor (occasional)

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

Litter will not lift when foot pedal pumped

Hydraulic litter does not lift when foot pedals are pumped

Ranked causes

  1. 1. Low hydraulic fluid level (common)
  2. 2. Air in hydraulic system (common)
  3. 3. Pump pedal cylinder malfunction (occasional)

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

Scale system will not turn on caution

Integrated weighing scale system cannot be powered on

Ranked causes

  1. 1. Scale system lockout toggle switch activated (common)
  2. 2. Scale system switch board defect (occasional)
  3. 3. Scale CPU board malfunction (occasional)

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

Weigh system shuts off prematurely

Weight measurement system stops functioning before expected or during measurement

Ranked causes

  1. 1. Weigh cable connection issue (common)
  2. 2. Load cell malfunction (occasional)
  3. 3. Scale CPU board failure (occasional)

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

Bed completely unresponsive with dead displays patient safety

No response to any commands and all displays are off

Ranked causes

  1. 1. Blown main fuse at junction board (common)
  2. 2. No power to litter control or power boards (occasional)

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

Faulty load cell suspected

Load cell output is jumpy, drifting, displays 000.0 or 999.9, or weight readings are inconsistent

Ranked causes

  1. 1. Load cell assembly malfunction (common)
  2. 2. Load cell cable fault (common)
First check

Enter diagnostic mode

Test point
Scale monitor
Expected
DOWNLOAD BARCODE displayed

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

Fowler and Knee Gatch both move when one activated patient safety

Dual movement when only one function is selected by operator

Ranked causes

  1. 1. Patient control malfunction or cross-connection (common)
  2. 2. Litter control board malfunction causing cross-switching (occasional)

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

Fowler and/or Knee Gatch does not lower during Emergency Drop mode

Fowler and/or knee section of bed fails to lower during emergency drop operation

Ranked causes

  1. 1. Bellows cap switch malfunction or misposition (common)
  2. 2. Switch capability issue (occasional)

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

Motor sounds slushy with non-smooth lift patient safety

Motor produces abnormal fluid noise and lift motion is jerky or uneven

Ranked causes

  1. 1. Air in hydraulic system (common)
  2. 2. Air bubbles in suction line causing motor damage (occasional)

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

Scale system requires calibration

Load cell assembly or scale CPU replaced; scale readings need adjustment

Ranked causes

  1. 1. Multiple load cell assemblies replaced (occasional)
  2. 2. Scale CPU replaced (occasional)
First check

Remove scale system power

Test point
Scale lockout switch
Expected
Scale lockout switch toward foot of bed

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

Steer wheel does not engage or disengage properly

Steer wheel fails to engage or disengage correctly

Ranked causes

  1. 1. Steer wheel linkage misalignment (common)
  2. 2. Worn tension spring (occasional)

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

Trendelenburg and/or Reverse Trendelenburg does not work in lowest position

Head-down or head-up positioning function fails when bed is in lowest position

Ranked causes

  1. 1. Bellows cap switch malfunction or misposition (common)
  2. 2. Solenoid malfunction (occasional)

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

Calibration: Fowler display LED alignment

90 degree LED on Fowler display not properly lit or positioned

Ranked causes

  1. 1. Fowler potentiometer electrical alignment incorrect (common)
First check

Adjust R8 potentiometer until 90 degree LED on Fowler display lights

Test point
R8 on litter control board, Fowler display LED
Expected
90 degree LED lighted and centered in operating range
Tools
Jewelers Screwdriver, Red Lacquer

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

Calibration: Fowler potentiometer alignment

LED alignment incorrect on Fowler display or after replacing litter control board

Ranked causes

  1. 1. Fowler potentiometer shaft misaligned mechanically (common)
First check

Measure resistance between black wire and green wire on Fowler pot cable

Test point
Fowler pot cable, black and green wires
Expected
between 55 and 65 ohms, 55–65 ohms
Tools
Volt/Ohm Meter

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

Calibration: Trendelenburg potentiometer alignment

Trendelenburg display alignment or potentiometer linkage misaligned

Ranked causes

  1. 1. Trendelenburg potentiometer shaft misaligned (common)

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

Calibration: Weight system

Perform calibration procedure for the weight measurement system on the Renaissance 2020 hospital bed

Ranked causes

  1. 1. Weight system requires calibration (unknown)
First check

Verify litter surface is flat before placing calibration weight

Test point
Litter surface
Expected
Flat

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

Cardiac Chair does not achieve proper positioning

Cardiac chair section fails to reach or maintain proper positioning

Ranked causes

  1. 1. Potentiometer adjustment incorrect (common)

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

Defective load cell identification

Isolate which load cell assembly is malfunctioning using corner weight display

Ranked causes

  1. 1. Individual load cell assembly failure (occasional)
First check

Access Display Corner function

Test point
Diagnostic mode menu
Expected
Display Corner function available in diagnostic mode

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

Emergency Drop delay longer than 3 seconds

Emergency drop function takes longer than 3 seconds to execute

Ranked causes

  1. 1. Litter control board malfunction (common)

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

LED position lights not accurate

LED indicators for bed position do not correctly reflect actual bed position

Ranked causes

  1. 1. Potentiometer position incorrect (common)

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

Litter will not lift electrically patient safety

Bed mattress platform cannot be raised using electric motor

Ranked causes

  1. 1. Motor capacitor failure (common)

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

Litter will not lower with foot pedals depressed

Hydraulic litter does not lower when foot pedals are depressed

Ranked causes

  1. 1. Valve control linkage misalignment (common)

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

Load cell assembly requires configuration

Single load cell assembly replaced; scale requires LBS/Volts configuration update

Ranked causes

  1. 1. Single load cell assembly replaced (common)
First check

Enter diagnostic mode

Test point
Scale monitor
Expected
Scale monitor displays DOWNLOAD BARCODE

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

No positioning functions with power lights still on patient safety

Fowler or Knee Gatch positioning not responding while main power is active

Ranked causes

  1. 1. Fowler or Gatch safety switch tape obstructed or damaged (common)

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

Power board hums

Power board produces audible humming sound

Ranked causes

  1. 1. Power board failure or component issue (common)

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

Steering wheel engagement loss or excessive friction

Steer caster lever engagement not engaging or disengaging properly during steering operation

Ranked causes

  1. 1. Steer caster linkage lever engagement out of adjustment (common)

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

Weight system calibration not proceeding

Scale display does not show expected ADD LBS HIT ON message after correcting reference number

Ranked causes

  1. 1. Reference number not correctly entered or confirmed (common)
First check

Verify reference number was correctly entered before pressing WEIGHT SYSTEM ON

Test point
Display screen
Expected
ADD LBS, HIT ON

1 corrective action and part numbers 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.