Infant incubators · Giraffe family

GE Healthcare Giraffe OmniBed: troubleshooting and error codes

The ServiceForge knowledge base holds 83 documented symptoms for the GE Healthcare Giraffe OmniBed, with 183 ranked causes, 102 diagnostic checks with test points and expected values, and 89 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Unit will not power up, alarm sounds patient safety

Power-up failure with audio alarm

Ranked causes

1. Defective scale (occasional)
2. Defective scale harness (occasional)
3. Defective Servo Oxygen board (occasional)
4. Defective Servo Oxygen cable (occasional)
5. Defective 9V battery (occasional)
6. Defective power supply (occasional)
7. Defective power harness to display (occasional)
8. Defective display driver board (rare)
9. Defective control board (rare)

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

Low oxygen level patient safety

Sensor1 reading drops more than 3% below oxygen set point 7 minutes after set point change or canopy closure. Indicated by Low Oxygen alarm.

Ranked causes

1. Low O2 supply pressure or flow (common)
2. Inlet screen occluded (common)
3. Air leaks into infant compartment (occasional)
4. Supply valve not opening (occasional)
5. Endcap safety valve not opening (occasional)
6. Calibration valve stuck closed (occasional)
7. Infant compartment vents occluded (occasional)

First check

Verify O2 supply pressure

Test point: System inlet
Expected: Greater than 45 psi (310 kPa)

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

System Failure 25: Fan rotation not detected caution

Fan rotation is not being detected during operation or power-up; optical fan sensor not detecting fan motion

Ranked causes

1. Fan not connected or jack loose (common)
2. Fan or fan hub not seated properly (common)
3. Fan speed too low (occasional)
4. Old design fan (occasional)
5. Defective or obstructed optical sensor (occasional)
6. Defective 50 pin ribbon cable (occasional)
7. Defective relay board (rare)

First check

Fan connected and jack secure?

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

Elevating base AND canopy will not move caution

Neither base elevation nor canopy movement operates

Ranked causes

1. Pedal switches disabled on setup screen (common)
2. Defective toroidal transformer (occasional)
3. No mains input to transformer (occasional)
4. Defective fuse on relay board (occasional)
5. Defective 50-pin ribbon cable (occasional)
6. Defective relay board (rare)

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

Fan failure

Fan rotation not detected; optical fan sensor not detecting fan rotation

Ranked causes

1. Fan hub not seated properly on fan shaft (common)
2. Defective fan motor (occasional)
3. Old design fan (occasional)
4. Defective or obstructed optical sensor, sensor holder, or gasket (occasional)
5. Defective 50 pin ribbon cable between relay and control board (rare)
6. Defective relay board (rare)

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

ADD WATER message stays on after water added

Water level indicator remains active despite refilling

Ranked causes

1. Reservoir switch button jammed (common)
2. Defective reservoir switch (occasional)
3. Defective 50-pin ribbon cable (occasional)
4. Defective relay board (rare)
5. Defective control board (rare)

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

Humidifier failure

Humidifier not operating; can be caused by non-humidifier issues including safety relay 2 not energized

Ranked causes

1. Motor drive failure alarm active (occasional)
2. Elevating base does not function (occasional)
3. Humidifier safety thermostat is open (common)
4. Defective humidifier heater or safety thermostat (occasional)
5. No mains voltage at humidifier isolation transformer input (occasional)

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

System Failure 30: Mains voltage out of range caution

Mains voltage reading LV1 outside expected range; voltage not within specified limits

Ranked causes

1. Mains Voltage Comp Circuit not calibrated correctly (common)
2. High or low mains voltage (common)
3. Defective 50 pin ribbon cable (occasional)
4. Defective relay board (occasional)
5. Defective control board (rare)

First check

Mains voltage within range? (100V: 80-115V, 115V: 95-132V, 230V: 195-270V)

Expected: 100V: 80-115V, 115V: 95-132V, 230V: 195-270V

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

Canopy will not move with pedal or hand switches caution

Canopy remains stationary while base works OK

Ranked causes

1. Canopy motor turns - defective belt or clutch (occasional)
2. Canopy motor does not turn - defective motor (occasional)
3. Defective 50-pin ribbon cable (occasional)
4. Defective relay board (rare)

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

Heater doors not closed

Alarm activates as canopy reaches halfway down and heater doors are not both closed

Ranked causes

1. Doors not closing fully (common)
2. Defective switch or harness (occasional)
3. Defective 50 pin ribbon cable between relay and control board (rare)
4. Defective relay board (rare)

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

Heater doors not opened

Alarm activates as canopy reaches top of travel and heater doors are not both open

Ranked causes

1. Doors not opening fully (common)
2. Defective switch or harness (occasional)
3. Defective 50 pin ribbon cable between relay and control board (rare)
4. Defective relay board (rare)

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

Oxygen probe failure patient safety

One or both sensors reading out of valid range (23-280 millivolts) or difference between two O2 sensors exceeds 3%. Indicated by Oxygen Probe Failure alarm.

Ranked causes

1. Defective sensor(s) (occasional)
2. Leak or occlusion in sensor housing area (occasional)
3. Defective cable or connection (occasional)
4. Defective Servo O2 board (occasional)

First check

Verify sensor voltage readings in service mode

Test point: sensor0 and sensor1 display values
Expected: Both 23-280 millivolts; oxygen0 and oxygen1 within 3% of each other

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

Oxygen system failure - temperature out of range

Sensor plug thermistor temperature reading is out of valid range 15°C-55°C. Indicated by Oxygen System Failure 1 alarm.

Ranked causes

1. Unit temperature below 15°C (common)
2. Cooling fan not running above 50°C (occasional)
3. Defective sensor plug thermistor or cable (occasional)
4. Defective Servo O2 board (occasional)

First check

Verify ambient temperature and unit location

Test point: Sensor housing temperature sensor (temp reading in service mode)
Expected: 15°C or higher for normal operation

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

Oxygen system failure 5 - persistent low sensor reading after double alarm silence patient safety

Check O2 supply alarm silenced twice and sensor1 reading still not greater than 23%. Indicated by Oxygen System Failure 5 alarm.

Ranked causes

1. O2 supply not connected or insufficient flow (common)
2. Calibration valve stuck in calibration position (occasional)
3. Supply valves not opening (occasional)
4. Leak or occlusion in sensor housing area (occasional)

First check

Verify O2 supply pressure and flow

Test point: System inlet
Expected: Minimum 45 psi (310 kPa) and 45 L/min

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

Radiant heater failure high voltage

Radiant heater not turning on or current sense circuit not detecting it is on; alarm only when canopy at top position

Ranked causes

1. Defective radiant heater or wire harness (common)
2. Defective warmer solid state relay (SSR) (occasional)
3. Defective 50 pin ribbon cable (rare)
4. Defective relay board (rare)

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

System Failure 36: LV1 differs from LV2 by >10% caution

LV1 voltage differs from LV2 voltage by more than 10% of LV2; voltage compensation readings mismatched

Ranked causes

1. Mains Voltage Comp Circuit not calibrated (common)
2. Defective 50 pin ribbon cable (occasional)
3. Defective relay board (occasional)
4. Defective control board (rare)

First check

Ribbon cable pins 48 and 49 continuity good?

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

Canopy works in one direction only caution

Canopy moves up or down but not both directions

Ranked causes

1. Defective canopy motor (occasional)
2. Defective 50-pin ribbon cable (occasional)
3. Defective relay board (rare)

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

Elevating base will not move, canopy works OK caution

Base elevation non-functional while canopy operates normally

Ranked causes

1. Pedal switches disabled on setup screen (common)
2. Defective elevating base motor (occasional)
3. Defective relay board (rare)

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

In transition - heat off

Canopy in transition between incubator and warmer modes; software not detecting end position switch closure

Ranked causes

1. Defective rail drive belt (occasional)
2. Spring tube not adjusted correctly (common)
3. Defective switch or harness (occasional)

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

Power failure

No AC power into unit or 5V power supply not present despite AC power available

Ranked causes

1. Power switch off or cord unplugged (common)
2. Defective fuses F1 or F2 (occasional)
3. Defective power supply (occasional)

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

Screen refreshes every few seconds while scale attached

Display flickers or updates excessively

Ranked causes

1. Defective control board circuit (occasional)
2. Defective scale (occasional)
3. Defective scale harness (occasional)

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

Servo-humidity RH setpoint shows 1-10 only

Humidity control range limited to 1-10 instead of full range

Ranked causes

1. Compartment probe not plugged in at startup (common)
2. Defective humidity sensor (occasional)
3. Defective control board (rare)

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

Bed will not lock in tilt position caution

Bed tilts but will not stay locked

Ranked causes

1. Tilt ball not engaged in finger pocket latch (common)
2. Tilt brake pad failure (occasional)

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

Calibration failed - sensors not in range patient safety

In calibration mode, after 5 minutes both sensors not reading between 23-55 millivolts. Unit cannot complete calibration. Indicated by Calibration failed alarm.

Ranked causes

1. Calibration valve not opening or calibration fan not running (common)
2. Defective sensors (occasional)

First check

Verify calibration valve opens and fan runs

Test point: Service mode Servo O2 screen, VC control
Expected: Click sound when VC opened; calibration fan audible; cooling fan stops

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

Canopy motor output voltage incorrect caution

Motor drive output voltage does not match expected control signal or voltage is not reaching motor

Ranked causes

1. Relay board control signal failure or motor relay fault (common)
2. Motor relay contact failure or wiring open (occasional)

First check

Measure canopy motor raise output voltage

Test point: Motor output connector J45 pins 1-2
Expected: +24V on pin 1, Gnd on pin 2, 24-32 V acceptable
Tools: DMM

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

Canopy raises slowly and sticks near top patient safety

Canopy rises slowly and becomes stuck 4-6 inches from full height when heater doors begin opening

Ranked causes

1. Rail lift belt failure with broken rungs (common)
2. Canopy motor coupler, slip clutch or roll pin defective (occasional)

First check

Visually inspect rail lift belt for broken rungs

Test point: Rail lift belt visible through bottom screw slot
Expected: Belt intact with no broken or stripped rungs

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

Check O2 supply - low sensor reading after calibration patient safety

After calibration, both supply valves opened and after approximately 20 seconds, sensor1 reading not greater than 23%. Indicated by Check O2 supply alarm.

Ranked causes

1. O2 supply not connected (common)
2. Kinked hoses in sensor housing (occasional)

First check

Verify O2 supply connection and pressure

Test point: System inlet
Expected: O2 supply connected; pressure minimum 45 psi (310 kPa), flow minimum 45 L/min

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

E-base motor output voltage incorrect caution

E-base lift motor drive voltage does not match expected values

Ranked causes

1. Relay board control signal failure or motor relay fault (common)
2. Motor relay contact failure (occasional)

First check

Measure e-base motor raise output voltage

Test point: Motor output connector J45 pins 1-2
Expected: +24V on pin 1, Gnd on pin 2, 24-32 V acceptable
Tools: DMM

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

FiO2 elevated above 26% patient safety

Elevated oxygen levels in patient compartment not controlled by servo O2 system. Oxygen reading above expected 26% baseline. Indicated by FiO2>26% alarm.

Ranked causes

1. Auxiliary source of oxygen in patient compartment (common)
2. Leak in servo O2 system supply valve (occasional)

First check

Inspect patient compartment for secondary oxygen source

Test point: Patient compartment, ventilator connection, resuscitation bag
Expected: No auxiliary oxygen delivery devices connected or in use

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

High oxygen level patient safety

Sensor1 reading more than 3% above oxygen set point. Indicated by High Oxygen alarm.

Ranked causes

1. Oxygen set point recently lowered (common)
2. Supply valve(s) not closing (occasional)

First check

Verify system stabilization time

Test point: oxygen0 and oxygen1 sensor readings
Expected: Readings approach set point over time; 3% variance acceptable after stabilization

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

In transition alarm sounds continuously patient safety

Alarm activates when canopy not at top or heater doors not fully open, preventing microswitches from activating

Ranked causes

1. Canopy not reaching full up position due to belt or motor failure (common)
2. Heater doors not reaching full open due to belt or linkage failure (common)

First check

Verify canopy up detect switch closes when canopy fully raised

Test point: Relay board J36 pins 1-2
Expected: Closed when canopy is up

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

Incubator heater resistance out of range caution

Measured resistance of incubator heaters and safety thermostat does not match expected values

Ranked causes

1. Incubator heater element open circuit or thermostat open (common)
2. One heater element failed or thermostat stuck open (occasional)

First check

Measure total incubator heater resistance

Test point: Between black wire on incubator SSR and white wire on isolation transformer (rev 9-) or J54 connector pin 4 (rev 10+)
Expected: About 24 ohms for parallel combination of two 48 ohm heaters
Tools: Ohmmeter or DMM

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

No audio alarm patient safety

Speaker producing no sound output

Ranked causes

1. Defective speaker or harness (common)
2. Audio driver circuitry defective (occasional)

First check

Speaker resistance at J40 pins 5-6

Expected: ~8 ohms
Tools: Ohmmeter

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

O2 calibration lost patient safety

Servo oxygen unit has not been calibrated or cell voltage is below 33 mV (earlier software versions). Unit will not operate until calibration performed. Indicated by O2 Cal Lost-No O2 alarm.

Ranked causes

1. Unit never calibrated or calibration data lost (common)
2. Cell voltage lower than 33 mV (older software) (occasional)

First check

Initiate oxygen calibration

Test point: Cal O2 button on service screen
Expected: Calibration routine starts; sensors read 23-55 mV within 5 minutes

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

Oxygen system failure - humidity reading out of range

Relative humidity sensor reading is out of valid range 1-99%. Displays 0 in service mode. Indicated by Oxygen System Failure 2 alarm.

Ranked causes

1. Defective sensor plug (occasional)
2. Defective Servo O2 board (occasional)

First check

Measure humidity sensor voltage

Test point: J85.2 to J85.1 (humidity sensor connector)
Expected: 0.7 to 4.0 Volts

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

Oxygen system failure 6 - communication failure

Giraffe control board cannot communicate with Servo O2 board. Indicated by Oxygen System Failure 6 alarm.

Ranked causes

1. Defective Servo O2 board (occasional)
2. Defective cable between control boards (occasional)

First check

Verify cable connection between control boards

Test point: Cable from Giraffe control board to Servo O2 board connectors
Expected: Cable fully seated on both ends with no visible damage

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

Power supply voltage out of range caution

Measured DC voltages on power distribution bus do not fall within tolerance

Ranked causes

1. Power supply or relay board voltage regulator failure (common)
2. Control board analog voltage regulator failure (occasional)

First check

Measure +5V supply voltage

Test point: J42 pins 1-2 (spare 4-pin connector on power bus)
Expected: 4.75 to 5.25 V, 4.75 to 5.25 V
Tools: DMM

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

Replace left rail rollers and tension springs

Left rail rollers can wear and require replacement; tension spring may also need service

Ranked causes

1. Roller wear or bearing failure (unknown)
2. Tension spring wear or failure (unknown)

First check

Remove roller mounting screw

Test point: Roller hub
Expected: Screw removed with 4mm hex key

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

Switch contact resistance excessive or open caution

Membrane switch resistance exceeds 200 ohms or switch does not close when pressed

Ranked causes

1. Membrane switch contact contamination or wear (occasional)
2. Membrane switch failed open circuit (rare)

First check

Measure membrane switch contact resistance

Test point: Display Driver board J21 (specific pins depend on switch)
Expected: Less than 200 ohms when switch is pressed, < 200 ohms
Tools: Ohmmeter or DMM

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

Temperature out of calibration patient safety

Calibration data lost or defective control board preventing temperature monitoring

Ranked causes

1. Calibration data lost (common)
2. Defective control board (occasional)

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

Thermistor resistance out of range caution

Temperature probe or heat sink thermistor resistance does not match expected value for measured temperature

Ranked causes

1. Thermistor sensor failure or disconnection (common)
2. Thermistor connector corrosion or loose contact (occasional)

First check

Verify air probe thermistor resistance matches temperature

Test point: Control board J1 pins 1-2 and 3-4 (air probe thermistors)
Expected: Resistance must match temperature reference table for measured compartment temperature
Tools: Ohmmeter, service screen thermometer display

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

Toroidal transformer output voltage absent or low high voltage

Secondary output voltage of toroidal transformer is not present or below expected level

Ranked causes

1. Toroidal transformer primary power failure or disconnection (common)
2. Toroidal transformer defective (open primary or secondary) (occasional)

First check

Measure toroidal transformer secondary output voltage (service mode)

Test point: Relay board J44 pins 1-2 and J44 pins 3-4
Expected: About 15 volts AC on both pin pairs V AC, ±2V typical
Tools: AC voltmeter or DMM set to AC volts

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

Unit always powers up in service screen mode

Cannot access normal operating mode from startup

Ranked causes

1. Defective dipswitch setting (common)
2. Override switch (>37C) shorted (occasional)

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

Unit will not switch to Baby Control Mode

Baby Control mode unavailable or disabled

Ranked causes

1. Patient probe plugged into Jack 2 (common)
2. Baby Control disabled on service screen (common)

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

50-pin ribbon cable continuity fault caution

Communication between control and relay boards interrupted due to ribbon cable fault

Ranked causes

1. 50-pin ribbon cable broken conductor or poor contact (occasional)

First check

Test 50-pin ribbon cable continuity

Test point: 50-pin ribbon cable connectors between control and relay boards
Expected: Low continuity (< 1 ohm) on each conductor; no open circuits
Tools: Ohmmeter, spare 50-pin cable for comparison

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

Air Temp >38C or >40C alarm active patient safety

Temperature alarm continues even after temperature returns to normal

Ranked causes

1. Alarm does not auto-reset (common)

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

Baby Cold or Hot Alarm does not trigger at setpoint patient safety

Temperature alarm not activating at expected threshold

Ranked causes

1. Manual Temp Alarm disabled on service screen (common)

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

Baby Hot or Baby Cold alarm in Manual Mode

Temperature alarms active in Manual temperature mode

Ranked causes

1. MANUAL TEMP alarm selected on setup screen (common)

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

Battery replacement due caution

Battery replacement every two years; battery powers failure alarm and memory circuits during power loss and requires charging.

Ranked causes

1. Two year battery service life expiration (common)

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

Bed warms up very slowly, may not reach set temperature patient safety

Inadequate heating or prolonged warm-up time

Ranked causes

1. One heater cartridge defective (common)

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

Calibration: Canopy alignment after seal replacement

Realignment procedure for canopy after installation of new enhanced seal kit to ensure proper positioning and operation.

Ranked causes

1. Canopy alignment required after seal replacement (common)

First check

Install rail locking screws in oblong slot on each rail

Test point: Oblong slots on east and west guide rails
Expected: Rail locking screws fully inserted to unlock rails

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

Calibration: Humidifier

Humidifier requires periodic calibration per maintenance schedule every three years.

Ranked causes

1. Scheduled maintenance interval reached (common)

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

Calibration: Scale

Periodic scale re-verification procedure required for EU NAWI directive compliance and legal metrology regulations. Requires certified 5 kg test weight (GE part 6600-0209-800).

Ranked causes

1. Periodic scale calibration required by regulation (common)

First check

Clear scale bed

Test point: Bed surface
Expected: Only mattress and clear plate remain; no other objects present

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

Calibration: Scale weight verification

Annual scale weight check and calibration if scales fail checkout procedures.

Ranked causes

1. Scale weight check failed (unknown)

First check

Perform scale weight checkout procedures

Test point: Scale
Expected: Weight reading matches reference standard

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

Calibration: Servo Controlled Oxygen patient safety

Initial oxygen system calibration setup and verification using service screen controls (V1, V2, VC, K1) and Cal O2 function to establish baseline sensor readings.

Ranked causes

1. Unit has never been calibrated (common)

First check

Verify O2 supply pressure and flow

Test point: System inlet
Expected: Minimum 45 psi (310 kPa) and 45 L/min

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

Calibration: Servo Controlled Oxygen System patient safety

Calibration required at least every 24 hours when servo oxygen is in use; system prompts user after 24 hours

Ranked causes

1. Routine calibration required (common)

First check

Verify two oxygen sensors are present and functioning

Test point: Sensor pair in sensing circuit beneath bed
Expected: Both sensors present and operational

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

Calibration: System VREF and Mains voltage high voltage

System calibration procedure to set reference voltage and mains voltage on control board after replacement or maintenance

Ranked causes

1. Control board replacement or calibration requirement (common)

First check

Turn power off

Test point: Main power switch
Expected: Power off

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

Canopy descends part way then stops or slows caution

Canopy movement intermittent or slow during descent

Ranked causes

1. Object fell into radiant heater floppy door opening (occasional)

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

Canopy is clouded

Cloudy or opaque canopy material

Ranked causes

1. Use of alcohol or hand-disinfectants (common)

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

Canopy misalignment caution

Canopy does not seat properly, gaps at corners, misalignment during raise/lower cycles

Ranked causes

1. Alignment nuts not properly tensioned (common)

First check

Measure gap at canopy corners

Test point: North and south canopy corners
Expected: Approximately 0.15 inch gap, ±0.05 inch

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

More symptoms

Canopy rises slowly and stops before doors open fully
Canopy seal difficult to remove or reinstall
Canopy seals worn or damaged
Fan running high speed without indicator
Heater doors do not fully open
Heater doors do not open fully
Heater element electrical failure
Humidifier heater resistance out of range
Humidifier reservoir crazed - hairline cracks
Humidifier reservoir has scaling
Motor drive failure
Noise from speaker on power down
Oxygen sensor replacement due
Oxygen sensors require replacement
Oxygen system failure - analog to digital converter test failed
Oxygen system failure - checksum test failed
Oxygen system failure 7 - watchdog circuit error
Radiant heater resistance out of range
Replace cable carrier links
Replace left rail buoyancy springs
Supply valve leak test required
Vent screen requires replacement
Ventilation screen replacement due

23 more symptoms with ranked causes and checks are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`Air Probe Failure`	Thermistors in air probe assembly differ by more than 0.5°C	Software detected difference in two air thermistors > 0.5°C	warning
`Air Probe Failure`	Air temperature probe malfunction detected	Air probe disconnected, damaged, or malfunctioning	error
`Air Temp >38C`	Air temperature exceeds 38 degrees Celsius	Incubator air temperature rises above 38°C threshold	warning
`Air Temp >40C`	Air temperature exceeds 40 degrees Celsius	Incubator air temperature rises above 40°C threshold	error
`Baby Cold`	Baby skin temperature too low	Infant skin temperature falls below safe threshold	warning
`Baby Hot`	Baby skin temperature too high	Infant skin temperature exceeds safe threshold	warning
`Baby Mode Disabled`	Baby mode has been disabled but mode button is pressed	Baby mode disabled in service screen and baby mode button pressed	info
`Baby Mode Disabled`	Baby temperature control mode is inactive	Baby mode control disabled or deactivated	error
`Baby Probe 1 Failure`	Baby temperature probe 1 malfunction	Baby probe 1 disconnected, damaged, or malfunctioning	error
`Baby Probe 1 Failure`	Patient probe 1 thermistors differ by more than 0.5°C	Probe thermistors show difference > 0.5°C	warning
`Baby Probe 2 Failure`	Baby temperature probe 2 malfunction	Baby probe 2 disconnected, damaged, or malfunctioning	error
`Baby Probe 2 Failure`	Patient probe 2 thermistors differ by more than 0.5°C	Probe thermistors show difference > 0.5°C	warning
`Bad Membrane Switch`	Membrane switch malfunction detected	Membrane switch not responding or damaged	error
`Bed Heater Failure`	Incubator heater not functioning or not detected	Software turned on heater but it is not on or current sense not detecting it	error
`Bed Heater Failure`	Bed heating element malfunction	Bed heater not operating or overheating	error
`Bed Up/Down Pedal Failure`	Bed elevation pedal control malfunction	Bed pedal not responding to input	error
`Bed Up/Down Pedal Failure`	Bed pedal switch is shorted or defective	One of the bed up/down pedal switches is shorted	warning
`Bed Up/Down Pedal Switches Disabled`	Bed pedal control disabled	Bed pedal switches disabled or deactivated	warning
`Calibration failed`	In calibration mode, after 5 minutes both sensors not reading between 23-55 mV; unit cannot complete calibration.	Cal O2 routine running >5 minutes; sensor0 or sensor1 outside 23-55 mV range	error
`Canopy Pedal Disabled`	Canopy control pedal disabled	Canopy pedal disabled or deactivated	warning
`Canopy Pedal Failure`	Canopy control pedal malfunction	Canopy pedal not responding to input	error
`Canopy Pedal Failure`	Canopy pedal switch is shorted or defective	One of the canopy pedal switches is shorted (appears ~100 seconds after short)	warning
`Canopy Pedal Pressed`	Canopy pedal held down during power-up	Canopy pedal switch pressed and held on during power up	info
`Canopy Pedal Pressed`	Canopy control pedal continuously activated	Canopy pedal stuck or held in pressed position	warning
`Check O2 supply`	After calibration with both supply valves opened, sensor1 reading not greater than 23% after approximately 20 seconds.	Cal O2 routine completed; both V1 and V2 controlled to open; sensor1 <23% after 20 seconds	warning
`Down Pedal Pressed`	Bed down pedal held down during power-up	Bed down pedal switch pressed and held on during power up	info
`Down Pedal Pressed`	Bed down control pedal continuously activated	Down pedal stuck or held in pressed position	warning
`Fan Always in High Speed`	Cooling fan stuck at high speed	Fan control unable to reduce fan speed	error
`Fan Failure`	Cooling fan malfunction detected	Fan not operating or not responding to control	error
`FiO2>26%`	Elevated oxygen levels in patient compartment not controlled by servo O2 system.	Measured oxygen concentration exceeds 26% and servo system cannot reduce it	warning
`Heater Doors Not Closed`	Heater door assembly is not fully closed	Door sensor detects open position during operation	warning
`Heater Doors Not Opened`	Heater door assembly fails to open as commanded	Door does not reach open position during startup or operation	error
`High Oxygen`	Sensor1 reading more than 3% above oxygen set point.	Sensor reading exceeds (oxygen set point + 3%)	warning
`Low Oxygen`	Sensor1 reading more than 3% below oxygen set point 7 minutes after set point change or canopy closed.	Sensor reading drops below (oxygen set point - 3%) and remains there for 7 minutes	warning
`Mains voltage calibration failed`	Entered mains voltage differs significantly from measured value	Dialed in line voltage is 20% different than measured value (not nominal value)	error
`Motor Drive Failure`	Motor drive circuit or motor has failed	Motor does not respond to control commands or stalls	error
`O2 Cal Lost-No O2`	Servo oxygen unit has never been calibrated or calibration data lost; unit will not operate.	No valid calibration data in memory; cell voltage below 33 mV (earlier software)	critical
`Oxygen Probe Failure`	One sensor reading out of range (23-280 mV) or difference between two oxygen sensors exceeds 3%.	sensor0 or sensor1 reading outside 23-280 mV range; difference between oxygen0 and oxygen1 exceeds 3%	error
`Oxygen System Failure 1`	Sensor plug thermistor temperature reading out of valid range 15°C-55°C.	Temperature reading <15°C or >55°C at power-up or during operation	error
`Oxygen System Failure 2`	Relative humidity sensor reading out of valid range 1-99%; displays 0 in service mode.	Humidity reading <1% or >99%	error
`Oxygen System Failure 3`	Checksum test performed during power-up testing failed.	Checksum test failure at power-up	critical
`Oxygen System Failure 4`	Analog to digital converter circuit self-test failed. Vtest reading out of valid range 1.216-1.254 V.	A/D converter self-test failure at power-up; Vtest <1.216 V or >1.254 V	critical
`Oxygen System Failure 5`	Check O2 supply alarm silenced twice and sensor1 still not greater than 23%.	Check O2 supply alarm manually silenced twice; sensor1 remains <23%	error
`Oxygen System Failure 6`	Giraffe control board cannot communicate with Servo O2 board.	Communication failure detected during normal operation or power-up	error
`Oxygen System Failure 7`	Power-up test detected a problem with the watchdog circuit.	Watchdog circuit test failure during power-up self-test	critical
`Power Failure`	Loss of main power supply	Power supply voltage drops below operating threshold	critical
`Radiant Heater Failure`	Radiant heating element or heater control circuit is not functioning	Heater output drops or fails to respond to temperature demand	error
`RH Sensor Calibration Failed Try Again`	Humidity sensor calibration routine failed to complete successfully	RH sensor signal falls outside the expected 65-85% RH range during calibration	error
`System Failure 0`	Communication error between display driver board and control board	Display and control board communication failure	critical
`System Failure 1`	No Timer2	Timer2 circuit not functioning	critical
`System Failure 11`	ADC not operating to spec (too slow)	ADC conversion speed below specification	error
`System Failure 12`	Incorrect control board software checksum	System software PROM checksum mismatch	critical
`System Failure 13`	Defective SRAM	SRAM circuit malfunction	critical
`System Failure 14`	Defective WDOG	Watch dog circuit malfunction	critical
`System Failure 15`	Safety Relay 1 test failure	Unable to control heater via safety relay 1 during self-test	critical
`System Failure 16`	Heater could not be turned off during self-test	Heater remained on during power-on self-test	critical
`System Failure 17`	Radiant heater could not be turned off during calibration	Radiant heater remained on during calibration self-test	error
`System Failure 18`	Defective Variables	Detected during system startup or operation	error
`System Failure 19`	No Audio Frequency	Audio circuit malfunction detected	error
`System Failure 2`	Timer2 too fast	Timer2 running at incorrect speed	error
`System Failure 20`	Display WDOG Time Out	Display watchdog timer expired	error
`System Failure 22`	Radiant heater and incubator heater will not turn ON	Neither heater responds during operation	warning
`System Failure 23`	Unable to turn OFF heaters	Heaters remain ON when commanded OFF	warning
`System Failure 25`	Fan rotation not detected	Optical fan sensor does not detect fan motion during power-up or operation	error
`System Failure 26`	Unable to turn off safety relay 1	Safety relay 1 does not respond to OFF command during power-up tests	critical
`System Failure 27`	Defective non-volatile memory	Memory integrity check failed	error
`System Failure 28`	Display lost communication with control board	Communication link interrupted between display and control boards	error
`System Failure 29`	Defective signal on control board	Signal integrity check failed	error
`System Failure 3`	ADC channel out of range during calibration	Calibration detected out-of-range ADC channel	error
`System Failure 30`	Mains voltage LV1 outside expected range	Measured mains voltage exceeds specified limits	warning
`System Failure 33`	Defective RH Solid State Relay	Radiant heater relay failure detected	error
`System Failure 34`	Software revision level does not match	Control board and display board software versions incompatible	error
`System Failure 35`	Wrong dipswitch setup	Dipswitch configuration on control board incorrect	warning
`System Failure 36`	LV1 differs from LV2 by >10%	Voltage comparison readings diverge beyond 10% tolerance	warning
`System Failure 37`	Defective switches (software 1.60+)	Canopy position switches show contradictory state	warning
`System Failure 38`	Door switch contradiction	Door switches show doors both open and closed	warning
`System Failure 5`	Volt reference out of range	Reference voltage outside 1.171V-1.259V range	error
`System Failure 50`	Display driver board software checksum error	System Software PROM checksum verification failed	error
`System Failure 51`	Display defective SRAM	SRAM memory test failed on display board	error
`System Failure 52`	Display no timer 2	Timer 2 not responding on display board	error
`System Failure 53`	Display timer 2 too fast	Timer 2 running at incorrect speed	error
`System Failure 55`	Display board on-line self-test failure	Display board failed self-test during power-up or diagnostics	critical
`System Failure 6`	Defective overtemp DAC circuit	Over-temperature DAC circuit malfunction	error
`System Failure 60`	Line circuit failure	Relay board LV2 calibration circuit failure during calibration	error
`System Failure 7`	Thermistor reference voltage out of range	1.0V thermistor reference outside 0.951V-1.049V	error
`System Failure 8`	No line frequency	120 Hz line frequency signal missing	critical
`System Failure 98`	Overflow	Data or resource overflow condition	critical
`System Failure 99`	Logic problem on control board	Control board software logic error	critical
`Temperature out of Calibration`	Temperature sensor reading exceeds calibration limits	Temperature measurement drifts outside acceptable calibration range	warning

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ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.