Mattress pressure relief systems · XPRT family

Stryker 2950: troubleshooting and error codes

The ServiceForge knowledge base holds 38 documented symptoms for the Stryker 2950, with 108 ranked causes, 78 diagnostic checks with test points and expected values, and 35 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Compressor on 100% while filling rotation cell; sensor select solenoid stuck or failing caution

Compressor runs continuously; pressure transducer may be monitoring wrong cell during rotation

Ranked causes

1. Sensor select solenoid valve stuck in energized state (occasional)
2. Sensor select solenoid valve stuck in de-energized state (occasional)
3. Compressor output insufficient (occasional)
4. Kinked supply tubing in mattress (common)
5. Plugged bulkhead fitting at foot box (occasional)
6. Main valve sticking or failing (occasional)
7. CPR engagement or O-ring issue (occasional)

First check

Run diagnostic test and observe pressure display during rotation cell fill

Test point: service screen diagnostic test
Expected: Pressure display changes when cell inflates

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

Percussion motor does not run

Percussion motor fails to operate or starts then stops

Ranked causes

1. Drive belt broken or worn (common)
2. Percussion shaft binding or bearing wear (common)
3. Shaft pulley has loose set screws (occasional)
4. Percussion motor connectors not fully seated at TB2 or TB8 (occasional)
5. Percussion motor voltage not present or incorrect (occasional)
6. Optical sensor voltage missing or out of specification (occasional)
7. Optical sensor blue/white voltage out of specification or flag misaligned (occasional)

First check

Inspect percussion drive belt

Test point: drive belt
Expected: Belt intact and not excessively worn

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

Diagnostic test cell did not inflate to 50 mmHg within 3 minutes caution

Production or diagnostic test failed; cell inflation insufficient during service screen testing

Ranked causes

1. Tubing leaks at connections (common)
2. Leaks in cells (common)
3. CPR engagement or O-ring issue (occasional)
4. Compressor output insufficient (occasional)
5. Kinked supply tubing in mattress (common)
6. Plugged bulkhead fitting at foot box (occasional)

First check

Inspect tubing connections for leaks

Test point: all tubing connections
Expected: No visible leaks or moisture

5 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Mattress has no power caution

Mattress is not receiving or supplying electrical power

Ranked causes

1. Power cord disconnected or improperly connected (common)
2. Head box alarm sounding, foot box connector disconnected (common)
3. Fuse blown or defective (common)
4. Power inlet filter defective (occasional)
5. Power board DC voltage output defective (occasional)
6. Transformer defective (occasional)

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

Mattress unable to reach set point pressure within 10 minutes patient safety

Unit may not complete Preparing Surface screen; displays Service Required message

Ranked causes

1. Tubing leaks at connections (common)
2. Leaks in air cells (common)
3. CPR engagement or O-ring issue (occasional)
4. Compressor output insufficient (occasional)
5. Kinked supply tubing in mattress (common)
6. Plugged bulkhead fitting at foot box (occasional)

First check

Inspect tubing connections for leaks

Test point: all tubing connections
Expected: No visible leaks or moisture

5 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Over temperature in foot box caution

Foot box temperature exceeds 140°F (60°C); displays auto overload shutdown message

Ranked causes

1. Blue cable white/green or orange/white conductor intermittent or shorted (occasional)
2. Kinked supply tubing in mattress (common)
3. Kinked Low Air Loss tubing (common)
4. Plugged bulkhead fitting at foot box (occasional)
5. Kinked tubing from compressor to bulkhead fitting (occasional)
6. Supply tubing too close to or touching sensor U5 (rare)

First check

Let unit cool and reset service alarm

Test point: mattress power and service screen
Expected: Temperature returns below 140°F

7 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Touch screen does not respond caution

Display will not accept input or commands

Ranked causes

1. No power to display backlight (common)
2. Display power supply voltage missing (occasional)
3. Controller or display defective (occasional)
4. Communication cable defective between foot and head box (occasional)
5. CPU board defective (occasional)
6. Controller connector contact problems (occasional)

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

No heartbeat between touchscreen and head box control

Pendant disconnected or communication lost between control units

Ranked causes

1. Pendant not connected during power-up (common)
2. Black cable connector loose or not twist locked (common)
3. Wire continuity break in black cable from foot box to pendant PCB (occasional)
4. Wire continuity break in blue cable between foot and head box (occasional)
5. Wire continuity break in yellow cable between foot and head box (occasional)

First check

Verify black cable connector is secure and twist locked

Test point: black cable connector at head box
Expected: Connector fully seated and twist locked

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

Stepper motor cannot find home in specified steps

Stepper motor/rotary valve does not complete home finding sequence during power-up

Ranked causes

1. Stepper motor or rotary valve not reaching home position correctly (occasional)
2. Rotary valve binding or jammed (occasional)
3. Connectors not fully seated in head box control PC board TB9 or TB10 (occasional)
4. Optical sensor voltage not present or out of range (occasional)
5. Optical sensor blue/white wire voltage out of specification (occasional)

First check

Observe stepper motor home finding sequence during power-up

Test point: stepper motor and rotary valve
Expected: Motor completes two revolutions and stops with flag in front of optical sensor

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

Left CPR plug not detected

CPR plug on patient left side not engaged or switch not detecting contact

Ranked causes

1. CPR plug not fully engaged or not snapped on patient left side (common)
2. Blue wires not connected to CPR switch contacts (occasional)
3. No continuity between blue wires when CPR plug engaged (occasional)
4. Connector not fully engaged to head box control PC board TB6 (occasional)

First check

Verify left CPR plug is fully engaged and snapped

Test point: CPR plug on patient left side
Expected: Plug fully engaged and snapped into socket

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

Percussion cells did not inflate to pressure within 10 seconds patient safety

Main percussion cell pressure failed to reach set point during inflation cycle

Ranked causes

1. Leaks in percussion cells (common)
2. Compressor output insufficient (occasional)
3. Kinked supply tubing in mattress (common)
4. Plugged bulkhead fitting at foot box (occasional)

First check

Inspect percussion cells for leaks

Test point: all percussion cells
Expected: No visible leaks or air escape

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

Right CPR plug not detected

CPR plug on patient right side not engaged or switch not detecting contact

Ranked causes

1. CPR plug not fully engaged or not snapped on patient right side (common)
2. Violet wires not connected to CPR switch contacts (occasional)
3. No continuity between violet wires when CPR plug engaged (occasional)
4. Connector not fully engaged to head box control PC board TB6 (occasional)

First check

Verify right CPR plug is fully engaged and snapped

Test point: CPR plug on patient right side
Expected: Plug fully engaged and snapped into socket

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

12 volt supply drops below 10 volts

Power supply voltage insufficient; control system may malfunction

Ranked causes

1. 24-30 volt input power not present at power PC board or control PC board (occasional)
2. 12 volt output voltage not present at TP9 (occasional)
3. Control PC board failure or regulation circuit issue (occasional)

First check

Measure input voltage at power PC board

Test point: power PC board J4 pins 3 and 4
Expected: 24 to 30 volts DC unfiltered VDC, 24-30 VDC
Tools: DMM

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

Mattress will not inflate patient safety

Mattress chambers do not inflate when powered on

Ranked causes

1. Alarm condition indicated in error log (common)
2. Pump not running or CPR plugs not inserted (common)
3. Main air hose disconnected or kinked (common)

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

No pressure difference detected between two rotation circuits caution

Both rotation cells filling simultaneously instead of alternating; system cannot track individual cell pressure

Ranked causes

1. CPR engagement or O-ring issue (common)
2. Leakage path between rotation cells (common)
3. Low rotation rate setting combined with patient movement or empty mattress (common)

First check

Verify CPR engagement and O-ring condition

Test point: CPR plugs and O-ring seals
Expected: CPR fully engaged, O-rings properly seated

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

Over temperature in head box caution

Head box temperature exceeds 140°F (60°C); displays auto overload shutdown message

Ranked causes

1. Overheated percussion motor (common)
2. Percussion motor belt tension incorrect (common)
3. Connecting rod bearing worn or damaged (occasional)

First check

Verify percussion motor is not overheated

Test point: percussion motor housing
Expected: Motor cooled to safe temperature

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

Bladder will not inflate or deflate patient safety

Mattress chambers remain static and do not respond to control inputs

Ranked causes

1. Solenoid resistance out of specification (common)
2. Selector valve resistance out of specification (occasional)

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

Both CPR plugs not detected

Neither left nor right CPR plug is engaged or detected by the system

Ranked causes

1. CPR plugs not fully engaged or snapped (common)
2. Connector not fully engaged to head box control PC board TB6 (occasional)

First check

Verify both CPR plugs are fully engaged and snapped

Test point: CPR plugs on both patient left and right sides
Expected: Both plugs fully engaged and snapped into sockets

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

Excessive pressure sensed in unintended air cell patient safety

Cell not intended to be filled is at high pressure; rotary valve may be stuck

Ranked causes

1. Rotary valve stopped at wrong position filling wrong cell (common)
2. Tubing connected incorrectly (occasional)

First check

Verify rotary valve position during therapy

Test point: rotary valve flag position at optical sensor
Expected: Flag aligned to correct cell being filled

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

Over-current detected in solenoid valve

Solenoid valve drive shows excessive current draw

Ranked causes

1. Cut or shorted wires between control PC board TB12 or TB14 and solenoid valve (occasional)
2. Solenoid valve failure (occasional)

First check

Inspect wiring to solenoid valve

Test point: wires from control PC board TB12 or TB14 to solenoid valve
Expected: No cuts, nicks or short circuits

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

Over-current detected on percussion motor

Percussion motor drive shows excessive current draw

Ranked causes

1. Cut or shorted wires between control PC board TB2 and percussion motor (occasional)
2. Percussion motor failure (occasional)

First check

Inspect wiring between TB2 and percussion motor

Test point: wires from control PC board TB2 to percussion motor
Expected: No cuts, nicks or short circuits

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

Over-current detected on stepper motor drive circuit

Stepper motor drive shows excessive current draw

Ranked causes

1. Cut or shorted wires between control PC board TB10 and stepper motor (occasional)
2. Rotary valve assembly failure (occasional)

First check

Inspect wiring between TB10 and stepper motor

Test point: wires from control PC board TB10 to stepper motor
Expected: No cuts, nicks or short circuits

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

Pendant has no power while mattress operates caution

Wireless controller not receiving power while system is running and head box is alarming

Ranked causes

1. Pendant connector disconnected from foot box controller (common)
2. Pendant or red connector defective (occasional)

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

Scale system performance degraded during dynamic therapy patient safety

Patient motion and position from active Percussion, Vibration, Rotation or Turn-Assist therapy affects scale accuracy and weight measurement reliability

Ranked causes

1. Scale zeroing or weighing attempted with active dynamic therapy modes (common)
2. Scale system not confirmed operational after mattress installation (occasional)

First check

Verify dynamic therapy modes are inactive

Test point: Mattress control panel
Expected: All Percussion, Vibration, Rotation and Turn-Assist indicators off

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

Abnormal temperature in foot box caution

Foot box temperature between 120-140°F (48.8-60°C), logged as information for trending

Ranked causes

1. Normal operating condition or early warning of temperature issue (unknown)

Abnormal temperature in head box caution

Head box temperature between 120-140°F (48.8-60°C), logged as information for trending

Ranked causes

1. Normal operating condition or early warning of temperature issue (unknown)

Alarm: Auto Overload Power Shut Down caution

Screen displays 'ALARM Auto. Overload Caused a Power Shut Down'; mattress automatically shuts down; requires immediate unplugging

Ranked causes

1. Power overload condition (occasional)

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

Alarm: Service Required by Qualified Service Personnel patient safety

Screen displays 'ALARM Service Required by Qualified Service Personnel'; mattress cannot provide therapy; occurs during power-up or therapy selection

Ranked causes

1. Unspecified fault preventing therapy delivery (unknown)

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

Compressor restarted 20 times with less than 20 seconds between restarts caution

Low pressure leak detected; logged as information for trending purposes

Ranked causes

1. Small air leak in system (common)

Controller detected corrupted memory

Control system memory error; controller requires replacement

Ranked causes

1. Control PC board memory failure or corruption (rare)

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

Head elevation at 60 degrees or greater during rotation therapy patient safety

Operator selected rotation therapy with head elevated beyond safe angle

Ranked causes

1. Operator error - rotation therapy selected at high elevation (common)

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

Mattress diagnostic test needed patient safety

Service technician needs to run mattress diagnostic to verify bladder integrity and leak status

Ranked causes

1. Routine service and verification of mattress condition (common)

First check

Verify mattress bladders are fully deflated before starting diagnostic test

Test point: Mattress cells
Expected: All cells completely deflated, no patient or external pressure on mattress

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

Max Inflate time limit reached patient safety

Operator selected Max Inflate nursing feature and did not return to therapy mode

Ranked causes

1. Operator did not return to therapy mode after max inflate (common)

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

Power cord interference with scale system caution

XPRT mattress power cord not secured, creating risk of physical interference with bed frame scale system components

Ranked causes

1. Power cord loose or unsecured during installation (common)

First check

Inspect power cord routing and security

Test point: Mattress power cord path from outlet to mattress
Expected: Cord secured away from scale system and bed frame moving components

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

Touch screen displays 'Preparing Surface' and will not proceed patient safety

Display shows preparing surface message and prevents normal operation

Ranked causes

1. Air leak in system (common)

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

Turn-Assist time limit reached patient safety

Operator selected turn-assist nursing feature and did not return to therapy mode

Ranked causes

1. Operator did not return to therapy mode after turn-assist (common)

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

Two or more foot box over-temperature alarms within 24 hours caution

Multiple FootEndHigh (code 70) alarms logged; thermal trend indicates persistent issue

Ranked causes

1. Recurring foot box temperature exceeding 140°F (common)

First check

Reset service log and monitor temperature

Test point: service screen
Expected: Service log cleared; foot box temperature remains below 140°F

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

Two or more head box over-temperature alarms within 24 hours caution

Multiple HeadEndHigh (code 72) alarms logged; thermal trend indicates persistent issue

Ranked causes

1. Recurring head box temperature exceeding 140°F (common)

First check

Reset service log via service screen

Test point: service screen and power cycling
Expected: Service log cleared; head box temperature remains below 140°F

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

Error codes

Code	Meaning	Trigger	Severity
`100`	Over pressure reading; excessive pressure in unintended air cell	High pressure detected in cell not intended to be filled	warning
`101`	12V power failure; 12 volt supply drops below 10 volts	12 volt supply voltage falls below 10 volts DC	error
`103`	Corrupted memory detected by controller	Controller detects memory corruption	critical
`104-0`	Sensor select solenoid valve issue; compressor on 100% while filling rotation cell	Compressor runs at 100% for extended time during rotation cell fill; error occurs if rotation rate parameters changed without stopping therapy	error
`104-1`	Sensor select solenoid valve issue; no pressure difference between rotation circuits	System detects both rotation cells filling simultaneously; pressure difference not detected between circuits	warning
`136`	Diagnostic test detected leak in rotation bladder circuit	Leak detection during main circuit diagnostic test	warning
`137`	Diagnostic test detected leak in left surface rotation bladder circuit	Leak detection in left surface circuit during diagnostic	warning
`138`	Diagnostic test detected leak in right surface rotation bladder circuit	Leak detection in right surface circuit during diagnostic	warning
`139`	Diagnostic test detected leak in left percussion bladder circuit	Leak detection in left percussion circuit during diagnostic	warning
`140`	Diagnostic test detected leak in right percussion bladder circuit	Leak detection in right percussion circuit during diagnostic	warning
`146`	Invalid command received by mattress controller	Malformed or unrecognized command sent to controller	error
`30`	Stepper motor did not reach home during initial rotation	Initial stepper motor rotation sequence failure	error
`6`	Failed first attempt to position the stepper motor	Stepper motor positioning error during operation	error
`65`	No heartbeat between touchscreen and head box control (pendant disconnected)	Loss of communication between control units or pendant not connected	warning
`66`	Left CPR plug not detected	System cannot detect engagement of left CPR plug	warning
`67`	Right CPR plug not detected	System cannot detect engagement of right CPR plug	warning
`68`	Both CPR plugs not detected	System cannot detect engagement of both CPR plugs	warning
`69`	Abnormal temperature in foot box	Foot box temperature between 120-140°F (48.8-60°C)	info
`70`	Over temperature in foot box; auto overload caused power shutdown	Foot box temperature exceeds 140°F (60°C)	error
`71`	Abnormal temperature in head box	Head box temperature between 120-140°F (48.8-60°C)	info
`72`	Over temperature in head box; auto overload caused power shutdown	Head box temperature exceeds 140°F (60°C)	error
`73`	Turn-Assist time limit reached	Turn-Assist feature selected but operator did not return to therapy mode	warning
`74`	Max Inflate time limit reached	Max Inflate feature selected but operator did not return to therapy mode	warning
`75`	Huge pressure leak; set point not reached within 10 minutes	System pressure fails to reach set point during Preparing Surface; unit may not complete screen	error
`76`	Low pressure leak; compressor restarted 20+ times with <20 sec intervals	Compressor restarted 20 times with less than 20 seconds between restarts	info
`77`	Stepper motor alarm; motor could not find home in specified steps	Stepper motor/rotary valve does not complete home finding sequence during power-up	error
`81`	Percussion motor speed alarm; percussion motor does not run	Percussion motor fails to start or run	error
`85`	Head elevation 60 degrees or greater during rotation therapy	Rotation therapy selected with head elevation ≥60 degrees	warning
`91`	Main pressure leak; percussion cells did not inflate within 10 seconds	Percussion cell pressure fails to reach set point during inflation cycle	error
`92`	Production test leak; diagnostic test cell did not inflate to 50 mmHg within 3 minutes	Cell under diagnostic test from service screen fails to inflate adequately	warning
`95`	Stepper motor over-current detected	Over-current detected on stepper motor drive circuit	error
`96`	Solenoid valve over-current detected	Over-current detected in solenoid valve drive circuit	error
`97`	Percussion motor over-current detected	Over-current detected on percussion motor drive circuit	error
`98`	Foot over-temperature service alarm; 2+ code 70 alarms within 24 hours	Multiple FootEndHigh (code 70) alarms logged within 24 hour period	error
`99`	Head over-temperature service alarm; 2+ code 72 alarms within 24 hours	Multiple HeadEndHigh (code 72) alarms logged within 24 hour period	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.