Birthing beds · Affinity family

Hill-Rom Affinity Three: troubleshooting and error codes

The ServiceForge knowledge base holds 69 documented symptoms for the Hill-Rom Affinity Three, with 127 ranked causes, 184 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

Battery back-up not providing power patient safety

Battery back-up system not functioning or unable to power bed during mains power loss

Ranked causes

1. Battery not properly charged (common)
2. Battery fuse open or failed (common)
3. Loose cable connections or wiring (occasional)
4. Battery charge circuit voltage out of range (occasional)
5. Transformer assembly failure (occasional)
6. Logic control PCB failure (occasional)
7. Battery cells failed or depleted (occasional)

First check

Verify battery is charged

Test point: Battery assembly
Expected: Battery properly charged and providing power

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

Bed air surface malfunction patient safety

Bed air surface does not function properly; air inflate, deflate, or mattress functions fail

Ranked causes

1. Faulty siderail switch board (common)
2. Logic control board output failure (occasional)
3. Cable or connector failure between boards (occasional)
4. Air compressor failure (occasional)
5. Air system control board failure (occasional)
6. Manifold, hose, or bladder obstruction/leak (occasional)

First check

Test individual air function switches on both siderails

Test point: Air surface control buttons
Expected: Only one switch non-functional or all switches in one siderail fail

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

Head motor does not raise patient safety

Head section fails to rise when head up switch activated on siderail

Ranked causes

1. Bed unplugged or lockout switch on (common)
2. Sheet or blanket caught in CPR release (occasional)
3. Head up switch on siderail faulty (occasional)
4. Logic control board faulty (occasional)
5. Head motor overheated or failed (occasional)
6. Logic control board voltage fault (rare)

First check

Verify bed power and lockout status

Test point: Power plug and lockout switch
Expected: Bed plugged in, lockout switch off

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

Foot section does not raise patient safety

Foot motor fails to lower foot section when foot down switch is activated on birthing bed

Ranked causes

1. Power supply issue or lockout switch on (common)
2. Faulty siderail switch control board (occasional)
3. Logic control board relay failure (occasional)
4. Foot motor thermal overload or failure (occasional)
5. Logic control board voltage output failure (occasional)

First check

Verify power and lockout switch status

Test point: Power plug and lockout switch
Expected: Bed plugged in, lockout switch off

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

Head motor does not lower patient safety

Head section fails to lower when head down switch activated on siderail

Ranked causes

1. Bed unplugged or lockout switch on (common)
2. Head down switch on siderail faulty (occasional)
3. Logic control board faulty (occasional)
4. Head motor overheated or failed (occasional)
5. Logic control board voltage fault (rare)

First check

Verify bed power and lockout status

Test point: Power plug and lockout switch
Expected: Bed plugged in, lockout switch off

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

Hilow down function does not lower bed

Bed does not lower when hilow down switch is activated on siderail control

Ranked causes

1. Bed not plugged in or lockout switch is on (common)
2. Faulty hilow down switch or switch board (common)
3. Logic control P.C. board relay failure (occasional)
4. Hilow motor failure or overheating (occasional)
5. Logic control P.C. board voltage output failure (rare)

First check

Verify bed is plugged in and lockout switch is off

Test point: Power and lockout switch
Expected: Bed plugged in, lockout switch off

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

Hilow up function does not raise bed

Bed does not raise when hilow up switch is activated on siderail control

Ranked causes

1. Bed not plugged in or lockout switch is on (common)
2. Faulty hilow up switch or switch board (common)
3. Logic control P.C. board relay failure (occasional)
4. Hilow motor failure or overheating (occasional)
5. Logic control P.C. board voltage output failure (rare)

First check

Verify bed is plugged in and lockout switch is off

Test point: Power and lockout switch
Expected: Bed plugged in, lockout switch off

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

Foot drive operation problems

Foot motor runs but exhibits noise, drift, or other operational issues

Ranked causes

1. Physical damage to drive system (occasional)
2. Improperly installed clevis or cotter pins (occasional)
3. Foot motor damaged under load (occasional)
4. Foot motor drift or loss of position hold (occasional)

First check

Inspect drive system for physical damage

Test point: Motor shaft, mounting, fasteners
Expected: No bent shaft, loose parts, or visible damage

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

Foot motor does not raise patient safety

Foot section fails to rise when foot up switch activated on siderail

Ranked causes

1. Bed unplugged or lockout switch on (common)
2. Foot up switch on siderail faulty (occasional)
3. Logic control board faulty (occasional)
4. Foot motor overheated or failed (occasional)

First check

Verify bed power and lockout status

Test point: Power plug and lockout switch
Expected: Bed plugged in, lockout switch off

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

Head motor runs but has operational problems caution

Motor is noisy, drifts, coasts, or shows other performance issues during head section raise/lower operation

Ranked causes

1. Physical damage to drive system (bent motor shaft, loose metal) (common)
2. Clevis pins or cotter pins not installed properly on head motor drive (common)
3. Head motor damaged under load (occasional)
4. Head motor unable to retain position or drifts when powered off (occasional)

First check

Visually inspect drive system for physical damage

Test point: Head motor shaft and drive mechanism
Expected: No bent shaft, no loose metal pieces

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

Hilow motor runs but has operational problems caution

Motor is noisy, drifts, coasts, or shows other performance issues during raise/lower operation

Ranked causes

1. Physical damage to drive system (bent motor shaft, loose metal) (common)
2. Clevis pins or cotter pins not installed properly on hilow motor drive (common)
3. Hilow motor damaged under load (occasional)
4. Hilow motor unable to retain position or drifts when powered off (occasional)

First check

Visually inspect drive system for physical damage

Test point: Motor shaft and drive mechanism
Expected: No bent shaft, no loose metal pieces

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

Night light does not illuminate

Night light fails to turn on when ambient light dims

Ranked causes

1. Lamp bulb or fixture damage (common)
2. Photocell malfunction (occasional)
3. Loose or disconnected lamp cable (occasional)
4. Logic control board failure (rare)

First check

Test night light function with dimmed ambient light

Test point: Night light and ambient light sensor
Expected: Night light comes on when ambient light dims

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

Siderail does not lock in raised position patient safety

Siderail does not click into locked position when raised from stow position, or does not remain latched when locked

Ranked causes

1. Obstructions or missing hardware in siderail mechanism (common)
2. Obstruction or loose fasteners preventing latch engagement (common)
3. Obstruction in center arm, loose fasteners, missing spring, or binding (occasional)
4. Interference from another bed component (rare)

First check

Raise siderail from stow position and verify locking

Test point: Siderail assembly
Expected: Siderail rises and clicks into locked position

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

Brake caster does not lock or roll caution

Brake caster pedal locks but casters do not roll, or pedal does not lock when pressed

Ranked causes

1. Excessive caster wear (common)
2. Caster assembly misalignment (occasional)
3. Mechanical interference with brake (rare)

First check

Test brake pedal lock

Test point: Brake caster pedal
Expected: Pedal locks in brake position when pressed

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

CPR release does not flatten head section patient safety

CPR release handle pulled but head section does not go to full flat position

Ranked causes

1. CPR function requires adjustment (common)
2. Head drive motor assembly damaged or missing parts (occasional)
3. Interference from another bed component (rare)

First check

Pull and hold CPR release handle

Test point: CPR release handle
Expected: Head section goes to full flat position

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

Brake and steer caster adjustment needed

Caster does not lock properly or brakes slip; ratcheting or improper steer position detected

Ranked causes

1. Brake setscrew tension incorrect (common)
2. Wax buildup on caster tire (occasional)

First check

Brake/steer pedal in neutral position

Test point: Brake/steer pedal
Expected: Neutral position

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

Brake caster does not hold position

Brake caster tire rolls when brake is engaged or brake slips during normal operation

Ranked causes

1. Brake setscrew insufficient tension (common)
2. Wax on brake caster tire (occasional)

First check

Brake setscrew adjustment - initial setup

Test point: Setscrew (D)
Expected: Light ratcheting then stops when adjusted

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

Calibration: Battery assembly replacement high voltage

Replace batteries that maintain bed function; located in electronics pan with cable connections to logic control board P5 and battery connection points

Ranked causes

1. Battery cable assembly requires reconnection to logic control board (common)
2. Battery connection points require reconnection (common)

First check

Set brake/steer pedal to brake position

Test point: brake/steer pedal
Expected: in brake position

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

Foot section not securely mounted during slide-off replacement patient safety

Foot section (slide-off type) may detach from bed after installation due to improper mounting on yoke slide brackets or latch mechanism

Ranked causes

1. Foot section channel slides not aligned with mounting brackets (common)
2. Latch mechanism not locked into channel slide (occasional)

First check

Align foot section channel slides with mounting brackets before sliding

Test point: channel slides (F) and mounting brackets (G)
Expected: slides aligned with brackets

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

Air system lumbar section does not deflate caution

Lumbar section fails to deflate when back deflate button is pressed

Ranked causes

1. Air system fault (unknown)

First check

Press back deflate button and activate bed air surface

Test point: lumbar section
Expected: Deflates

Air system lumbar section does not inflate caution

Lumbar section fails to inflate when back inflate button is pressed

Ranked causes

1. Air system fault (unknown)

First check

Press back inflate button and activate bed air surface

Test point: lumbar section
Expected: Inflates

Air system seat section does not deflate caution

Seat section mattress fails to deflate when seat deflate button is pressed and held

Ranked causes

1. Air system fault (unknown)

First check

Press and hold seat deflate button and activate bed air surface

Test point: seat section mattress
Expected: Deflates

Air system seat section does not inflate caution

Seat section mattress fails to inflate when seat inflate button is pressed

Ranked causes

1. Air system fault (unknown)

First check

Press seat inflate button and activate bed air surface

Test point: seat section mattress
Expected: Inflates

Auxiliary outlet assembly replacement high voltage

Replacement of auxiliary outlet assembly including cable routing restoration and connector verification.

Ranked causes

1. Auxiliary outlet assembly requires replacement (unknown)

First check

Note cable routing and orientation before removal

Test point: Auxiliary outlet cable assembly (C) routing under seat section
Expected: Cable path documented for reinstallation

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

Auxiliary transformer assembly replacement high voltage

Replacement of auxiliary transformer with electrical safety precautions and verification of proper installation.

Ranked causes

1. Auxiliary transformer assembly requires replacement (unknown)

First check

Ensure bed positioned correctly before service

Test point: Brake/steer pedal, bed position, head and hilow functions
Expected: Brake engaged, out of Trend-Like position, head and bed raised to high

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

Battery backup does not provide sufficient power patient safety

Battery backup fails to operate bed functions when unplugged from power source

Ranked causes

1. Battery backup fault or depletion (common)

First check

Unplug bed from power source; activate bed functions; verify battery operates functions

Test point: battery backup during unplugged operation
Expected: Battery backup provides sufficient power to operate bed functions

Bed does not auto-rise from low position when foot lowered patient safety

Bed fails to automatically rise from low position when foot is lowered from low position

Ranked causes

1. Automatic rise mechanism fault (unknown)

First check

Lower bed to low position; lower foot section with foot down switch; observe auto-rise

Test point: bed at low position with lowered foot
Expected: Bed automatically rises from low position

Bed does not lower with hilow down switch patient safety

Bed fails to lower when hilow down switch is momentarily activated

Ranked causes

1. Hilow motor or drive system fault (unknown)

First check

Momentarily activate the hilow down switch

Test point: hilow down switch
Expected: Bed lowers

Bed does not rise with hilow up switch patient safety

Bed fails to rise when hilow up switch is momentarily activated

Ranked causes

1. Hilow motor or drive system fault (unknown)

First check

Momentarily activate the hilow up switch

Test point: hilow up switch
Expected: Bed rises

Brake and steer functions do not operate properly caution

Brake/steer pedal functions fail to operate or position incorrectly

Ranked causes

1. Brake and steer function adjustment needed (common)

First check

Place brake steer pedal into brake position and then steer position

Test point: brake steer pedal
Expected: Brake and steer functions operate properly

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

Calibration: Battery charge circuit adjustment high voltage

Beds with 65345 logic control and 67208 interface PCBs require adjustment of battery charge circuit voltage for optimal battery function. Measurement taken at potentiometer R2 on logic control PCB.

Ranked causes

1. Battery charge circuit voltage out of specification (common)

First check

Measure voltage at positive side of D15 (test point K) with ground at negative side of C1 (test point J)

Test point: D15 positive side (K) to C1 negative side (J)
Expected: 27.6 to 28.0 V DC, +/- 0.2 V
Tools: VOM set to V DC

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

Calibration: Foot Limit Switch caution

Foot section does not reach correct minimum position or foot travel limits are incorrect. Verified by measuring gap between foot and hilow lift arms.

Ranked causes

1. Foot limit switch (LFD or LFU) out of adjustment (common)

First check

Measure gap between foot and hilow lift arms at foot low position

Test point: Between foot section left-hand lift arm (B) and hilow left-hand lift arm (C)
Expected: Exactly ¼" (6.4 mm) in, Exact
Tools: Tape measure

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

Calibration: Hilow Limit Switch caution

Bed does not reach correct maximum raised height or hilow travel limits are incorrect. Verified by measuring distance from top center of main frame to floor.

Ranked causes

1. Hilow limit switch (LBU or LBD) out of adjustment (common)

First check

Measure bed height at maximum raised position

Test point: Top center point of main frame at head end to floor
Expected: 31" ± ½" (787.4 ± 12.7 mm) in, ±½"
Tools: Tape measure

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

Calibration: Line voltage fuse replacement high voltage

Replace mains fuses protecting high voltage circuit; fuses located in fuse holder at head end of main frame and on air system control P.C. board

Ranked causes

1. Serviceable fuse required in fuse housing (common)

First check

Set brake/steer pedal to brake position

Test point: brake/steer pedal
Expected: in brake position

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

Caregiver siderail PC switch board malfunction high voltage

Switch board on outboard siderail not functioning or requires replacement

Ranked causes

1. Faulty PC switch board (unknown)

First check

Brake/steer pedal in brake position

Test point: Brake/steer pedal
Expected: Set to brake position

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

Caster assembly worn or damaged

Caster does not roll or swivel freely; requires replacement after removal

Ranked causes

1. Caster bearing worn or debris trapped (occasional)

First check

Brake/steer pedal in brake position

Test point: Brake/steer pedal
Expected: Brake position

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

Central braking system malfunction

Brake and steer pedal functions not working; system requires removal and replacement of brake mechanism

Ranked causes

1. Brake strip or rocker arm failure (rare)

First check

Siderail secured before bed is turned

Test point: Siderail assembly
Expected: Secured below bed or removed

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

CPR function does not lower head to flat in time patient safety

Head section fails to lower to flat position within 7 seconds when CPR release lever activated

Ranked causes

1. CPR release cables require adjustment (common)

First check

Distribute 50 lb weight on head section; activate CPR release lever; measure time to flat

Test point: head section with 50 lb load
Expected: Lowers to flat position within approximately 7 seconds

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

Foot motor does not lower patient safety

Foot section fails to lower when foot down switch activated on siderail

Ranked causes

1. Foot down switch or logic control board faulty (unknown)

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

Foot motor excessive noise or binding caution

Foot motor emits excessive noise or exhibits mechanical binding/grinding when activated

Ranked causes

1. Foot motor mechanical fault or obstruction (unknown)

First check

Activate foot up or down switch and listen for noise

Test point: foot motor
Expected: Free of excessive noise or mechanical binding/grinding

Foot section does not lower with foot down switch patient safety

Foot section fails to lower when foot down switch is pressed and activated

Ranked causes

1. Foot motor or drive system fault (unknown)

First check

Press foot down switch and activate foot section

Test point: foot down switch
Expected: Foot section lowers

Foot section does not rise with foot up switch patient safety

Foot section fails to rise when foot up switch is pressed and activated

Ranked causes

1. Foot motor or drive system fault (unknown)

First check

Press foot up switch and activate foot section

Test point: foot up switch
Expected: Foot section rises

Foot section lower limit incorrect patient safety

Foot drive does not stop at correct low position limit; gap from hilow lift arm incorrect

Ranked causes

1. Foot limit switch requires adjustment (common)

First check

Lower foot section to low position; measure gap to foot end hilow lift arm

Test point: foot lift arm above foot end hilow lift arm
Expected: 1/4" (6.4 mm) above foot end hilow lift arm inches, exact

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

Foot section not securely mounted during lift-off replacement patient safety

Foot section (lift-off type) may detach from bed after installation due to improper mounting on yoke latches

Ranked causes

1. Foot section slides not aligned with receptacles (common)

First check

Align foot section slides with receptacles before mounting

Test point: foot section slides (D) and receptacles (F)
Expected: slides aligned with receptacles

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

Foot section stops at incorrect limit position patient safety

Foot section does not stop at correct high position limit or gap from seat incorrect

Ranked causes

1. Foot limit switch requires adjustment (common)

First check

Raise foot section to high position using foot up switch; measure gap to seat section

Test point: top of foot section above seat section
Expected: Approximately 2-1/2" (6.35 cm) above seat section inches

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

Foot support cable binds or does not move freely caution

Cable ends bind in release handle mounting holes, restricting smooth operation of foot support release handle

Ranked causes

1. Cable tensioning nuts (F) too tight (common)

First check

Verify cable ends move freely in release handle mounting holes

Test point: cable ends in release handle weldment (G) mounting holes
Expected: ride freely without binding

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

Head motor excessive noise or binding caution

Head motor emits excessive noise or exhibits mechanical binding/grinding when activated

Ranked causes

1. Head motor mechanical fault or obstruction (unknown)

First check

Activate head up or down switch and listen for noise

Test point: head motor
Expected: Free of excessive noise or mechanical binding/grinding

Head section does not lower with head down switch patient safety

Head section fails to lower when head down switch is momentarily activated

Ranked causes

1. Head motor or drive system fault (unknown)

First check

Momentarily activate the head down switch

Test point: head down switch
Expected: Head section lowers

Head section does not rise with head up switch patient safety

Head section fails to rise when head up switch is momentarily activated

Ranked causes

1. Head motor or drive system fault (unknown)

First check

Momentarily activate the head up switch

Test point: head up switch
Expected: Head section rises

Head section drifts downward after raising patient safety

Head section drifts downward or coasts after being raised with head function

Ranked causes

1. Head motor or hold mechanism fault (unknown)

First check

Raise head section to high position; observe drift

Test point: head section
Expected: Stops and does not drift downward or coast

Hilow bed height limit incorrect at low position patient safety

Bed does not stop at correct low position limit or height measurement outside specification

Ranked causes

1. Hilow down limit switch (LBD) requires adjustment (common)

First check

Lower bed to low position; measure bed height from floor

Test point: bed height from floor
Expected: 16" ± ½" (41 cm ± 12.7 mm) inches, ± ½ inch

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

Hilow bed height limit incorrect at top position patient safety

Bed does not stop at correct high position limit or height measurement outside specification

Ranked causes

1. Hilow up limit switch (LBU) requires adjustment (common)

First check

Raise bed to high position; measure from floor to top of mainframe

Test point: side of bed from floor to top of mainframe
Expected: 31" ± ½" (79 cm ± 12.7 mm) inches, ± ½ inch

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

Hilow does not raise bed when foot lowered patient safety

Hilow function fails to automatically raise bed from low position when foot section is lowered to lowest point

Ranked causes

1. Hilow or foot limit switch malfunction (common)

First check

Test hilow function from siderails and pendant control

Test point: Hilow control switches
Expected: Hilow function works properly

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

Hilow motor excessive noise or binding caution

Hilow motor emits excessive noise or exhibits mechanical binding/grinding when activated

Ranked causes

1. Hilow motor mechanical fault or obstruction (unknown)

First check

Activate hilow up and down switch and listen for noise

Test point: hilow motor
Expected: Free of excessive noise or mechanical binding/grinding

Hilow sleep surface drifts downward after raising patient safety

Sleep surface drifts downward or coasts after being raised with hilow function

Ranked causes

1. Hilow motor or hold mechanism fault (unknown)

First check

Raise and lower sleep surface using hilow function; observe drift

Test point: hilow sleep surface
Expected: Surface stops and does not drift downward or coast

Labor grips do not latch or release properly patient safety

Labor grips fail to latch in full up position or do not release when release handle activated

Ranked causes

1. Faulty labor grips (common)

First check

Operate labor grips on both sides; raise to full up position; activate release handle

Test point: labor grips on both sides
Expected: Grips latch in full up position; release when handle activated

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

Lockout switch assembly replacement high voltage

Replacement of lockout switch assembly with electrical safety precautions and connector verification.

Ranked causes

1. Lockout switch assembly requires replacement (unknown)

First check

Verify unit unplugged and lockout engaged

Test point: Power source, lockout control
Expected: Unit unplugged, lockout control engaged

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

Lockout switch does not control functions properly caution

Lockout switch fails to lock/unlock inboard/outboard controls in OFF/ON positions

Ranked causes

1. Faulty rocker switch (common)

First check

Place lockout switch in OFF position (locked); verify controls locked; place in ON position (unlocked); verify controls enabled

Test point: lockout switch in both OFF and ON positions
Expected: Functions lock in OFF position; functions enable in ON position

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

Logic control P.C. board connector wiring order incorrect high voltage

Connector wiring sequence needs reversal for 68121 board compatibility; red, black, red, black alternating pattern required.

Ranked causes

1. Original connector wiring order incompatible with 68121 logic control board (common)

First check

Verify connector shell and backshell locked together

Test point: Locking tabs (D)
Expected: Tabs locked, holding connector housing firmly together

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

Logic control P.C. board replacement high voltage

Replacement of logic control P.C. board assembly with proper connector connections and post-installation verification.

Ranked causes

1. Logic control P.C. board requires replacement (unknown)

First check

Verify wiring connectors firmly seated on logic control board receptacles

Test point: All connectors on P.C. board
Expected: Connectors fully inserted and secured

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

More symptoms

Patient siderail PC switch board malfunction
Siderail assembly replacement
Siderail does not latch or lower properly
Siderail drops when pins removed
Siderail functions do not operate properly
Transformer assembly replacement
Trend-Like position cannot be set
Trend-Like position does not operate smoothly or sleep surface insecure
Wiring diagram installation and documentation

9 more symptoms with ranked causes and checks 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.