Anesthesia machines · Fabius family

Dräger Fabius Tiro: troubleshooting and error codes

The ServiceForge knowledge base holds 11 documented symptoms for the Dräger Fabius Tiro, with 18 ranked causes, 28 diagnostic checks with test points and expected values, and 100 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Power supply voltage out of range high voltage

Measured voltage at Controller PCB connectors does not fall within acceptable ranges for any of the distributed voltages

Ranked causes

1. Fuse open or blown in external power entry (common)
2. Battery fuse F4 open in power entry (common)
3. Fuse F1 open on Controller PCB (common)
4. Fuse F2 open on Controller PCB (common)
5. Fuse F3 open on Controller PCB (common)

First check

Measure +28 VDC at main power input

Test point: J6-1, Common at J6-4
Expected: 26.6 VDC to 29.4 VDC, +/-1.4 V
Tools: Multimeter/DMM

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

Fabius Tiro power-up self-test status display

Diagnostic system monitors and displays power-up test results on display screen before proceeding to Standby screen

Ranked causes

1. All power-up tests passed (common)
2. Minor problem detected during power-up tests (occasional)
3. Serious problem detected during power-up tests (rare)

First check

Observe power-up diagnostic screen display

Test point: Fabius Tiro display panel
Expected: Power-up screen with status message: FUNCTIONAL, CONDITIONALLY FUNCTIONAL, or NON-FUNCTIONAL

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

Vacuum Pressure Pump does not calibrate

Pump calibration operation fails or does not respond when activated through the Real Time Values screen.

Ranked causes

1. Incorrect PCB installed in Core Unit (unknown)
2. Hardware Part Number 4116632 installed (calibration not supported) (occasional)

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

Access system service screens

Service diagnostic functions available through display panel service screens for advanced troubleshooting

Ranked causes

1. User needs to access service menu for diagnostics or configuration (unknown)

First check

Enter service screen access mode

Test point: Fabius Tiro display panel buttons
Expected: Home and Standby keys held, rotary knob pressed

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

Calibration: Cylinder pressure regulator output caution

Adjust regulator output pressure to ensure consistent gas delivery across the cylinder pressure range. Affects oxygen, nitrous oxide, and air regulators.

Ranked causes

1. Regulator output pressure requires adjustment per cylinder supply variation (common)

First check

System Power switch position

Test point: System Power switch
Expected: OFF

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

Calibration: Fresh Gas Flow

Store zero-flow reference for flow measurement system

Ranked causes

1. Initial calibration or recalibration required (common)

First check

Main power switch state

Test point: main power switch
Expected: ON

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

Calibration: O2 Zero

Calibration procedure for O2 zero reference on Fabius Tiro anesthesia machine

Ranked causes

1. Calibration process fails (occasional)

First check

Follow on-screen instructions for O2 zero calibration

Test point: Calibration screen
Expected: Stored zero value displayed in cell A or B

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

Calibration: PEEP

Verify PEEP valve measurement accuracy; requires prior valid pressure calibration

Ranked causes

1. Pressure calibration not performed or invalid (common)

First check

Verify prior pressure calibration validity

Test point: Service records or calibration history
Expected: Valid pressure calibration exists

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

O2 SUPPLY alarm activates out of range patient safety

Alarm activates below 16 psi or above 24 psi during pressure decay test.

Ranked causes

1. Adjustment set screw not correctly positioned (common)

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

Oxygen monitor sensor not detected patient safety

Display shows 'O2 Sensor Fail!' message when sensor cable is disconnected from interface

Ranked causes

1. Oxygen sensor cable disconnected from Oxygen Sensor interface (common)

First check

Verify oxygen sensor cable connection to Oxygen Sensor interface

Test point: Oxygen Sensor interface
Expected: Cable firmly connected

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

Verify test gauge connection for regulator type

Connect test gauge appropriately based on which regulator is being adjusted (O2 vs N2O).

Ranked causes

1. Incorrect test gauge connection location per regulator type (occasional)

First check

Verify correct pipeline hose connection per gas type

Test point: Test gauge inlet/outlet connections
Expected: O2 adjustment: pipeline inlet; N2O adjustment: N2O pipeline hose

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

Error codes

Code	Meaning	Trigger	Severity
`APNEA FLOW!!`	Apnea alarm triggered due to cessation of airflow	No airflow detected for 13-17 seconds when breathing hose disconnected from expiratory port	warning
`C001`	Handler Busy	Communication error condition	error
`C002`	Incoming Overflow	Communication buffer overflow	error
`C003`	Outgoing queue overflow	Communication outgoing buffer overflow	error
`C004`	Message not registered	External communications error	error
`C005`	Character not transmitted	Serial transmission failure	error
`C006`	Interrupt problem	Hardware interrupt handling failure	error
`C007`	Continuous interrupts	Repeated hardware interrupt condition	error
`C008`	Excessive Breaks	Too many break characters received	error
`C009`	Excessive Framing	Multiple framing errors detected	error
`C010`	Excessive Parity	Multiple parity errors detected	error
`C011`	Excessive Overrun	Serial buffer overrun condition	error
`C012`	Non-existent UART	UART hardware not detected	error
`F001`	Diag Watchdog	Watchdog timer expired during diagnostics	critical
`F002`	Diag System Ram	System RAM fails on power up	critical
`F003`	Diag Program Memory	Flash memory test failure on startup	critical
`F004`	Diag Video Test	Video memory test failure on startup	critical
`F005`	Diag Interrupts	Interrupt handling test failure on startup	critical
`F006`	Diag A/D Converter	A/D converter test failure on startup	critical
`F007`	Diag NM Ram	Corrupt NVRAM entry on power up	error
`F008`	Diag Serial Port	Serial port loopback test fails on startup	error
`F009`	Diag Clock	Clock oscillator test failure on startup	critical
`F010`	Diag Speaker	Speaker not detected on power up	warning
`F011`	Diag Main Power	Mains power not detected on power up	warning
`F012`	Diag Battery	Battery voltage below 20% on power up	warning
`FG01`	N2O CAL ERR	N2O sensor reading out of calibration range	error
`FG02`	AIR CAL ERR	AIR sensor reading out of calibration range	error
`FG03`	O2 CAL ERR	O2 sensor reading out of calibration range	error
`I001`	CPU Diag Recovery	CPU recovered from bad initialization	warning
`I011`	L2 SW Watchdog	Level 2 software watchdog timer expiration	error
`I012`	L2 Recovered, w/ Level-Two Error Count	Level 2 software recovered with accumulated errors	warning
`I021`	L3 SW Watchdog	Level 3 software watchdog timer expiration	error
`I022`	L3 Recovered, w/ Level-Three Error Count	Level 3 software recovered with accumulated errors	warning
`I031`	L4 SW Watchdog	Level 4 software watchdog timer expiration	error
`I032`	L4 Recovered, w/ Level-Four Error Count	Level 4 software recovered with accumulated errors	warning
`Inv pres. cal`	Invalid pressure calibration detected	Attempted PEEP valve calibration without valid pressure calibration or system leak test	error
`M001`	O2 <10%	O2 sensor reading below 10%	warning
`M002`	O2 LOW INOP	O2 cell inoperative or disconnected	error
`M003`	O2 DIFF HIGH	Difference between O2 cells A and B exceeds 25%	error
`M004`	BATTERY <10%	Battery level drops below 10% during non-mains operation	warning
`M005`	BATTERY <20%	Battery level drops below 20% during non-mains operation	warning
`MINUTE VOLUME LOW!!`	Minute volume alarm triggered at low threshold	Measured minute volume drops below set low alarm limit	warning
`NVC0`	Non-Matching CRCS	CRC mismatch between primary and secondary NVRAM	error
`NVF0`	Pri and Sec NV Files Inv	Both primary and secondary NVRAM files corrupted	error
`NVF1`	Pri NV File Inv	Primary NVRAM file corrupted	error
`NVF2`	Sec NV File Inv	Secondary NVRAM file corrupted	error
`NVP1`	Pat Check Pri Fail	NVRAM primary pattern write failure	error
`NVP2`	Pat Check Sec Fail	NVRAM secondary pattern write failure	error
`O2 Sensor Calibration Failed`	Oxygen sensor calibration process did not complete successfully	calibration procedure did not achieve required accuracy or sensor malfunction	error
`O2 Sensor Fail!`	Oxygen sensor not detected or disconnected	Oxygen sensor cable disconnected from Oxygen Sensor interface	error
`PS01`	Charger Error	Charging process has timed out	error
`PS02`	-2.5 V Supply Failure	Negative 2.5 V supply out of range	critical
`PS03`	+12 V Supply Failure	+12 V supply out of range	critical
`PS04`	-5 V Supply Failure	Negative 5 V supply out of range	critical
`PS05`	Battery Less Than 18 V	Battery voltage drops below 18 V	error
`PS06`	+28 V Supply Failure	+28 V supply out of range	critical
`PS07`	Temp Sensor Failure	Temperature sensor reading out of range	error
`PS08`	2.5 V Supply Failure	Positive 2.5 V supply out of range	critical
`PS09`	3.3 V Supply Failure	3.3 V supply out of range	critical
`PS10`	+10 V Supply Failure	+10 V supply out of range	critical
`PS11`	+16 V Supply Failure	+16 V supply out of range	critical
`S006`	Service Log Clear	Service log cleared by technician or software upgrade	info
`SS90`	test message	Factory test condition	info
`U001`	New Device ID Created	Machine detected a new device ID was needed	warning
`U002`	Option Enabled	A secure option was enabled	info
`U003`	Option Disabled	A secure option was disabled	info
`U007`	Model Changed to FGS	Model type changed to FGS	info
`U008`	Model Changed to Tiro	Model type changed to Tiro	info
`U009`	Monitoring Disabled	Monitoring mode was disabled	warning
`U010`	Monitoring Enabled	Monitoring mode was enabled	info
`U012`	SOS Recovered	Secure Option Setting recovered after partial NVRAM corruption	warning
`U013`	FGS SOS Invalid	FGS Secure Options Setting NVRAM file corrupted	error
`U014`	Tiro SOS Invalid	Tiro Secure Options Setting NVRAM file corrupted	error
`V001`	VENT PEEP NOT CAL	Auto ventilation attempted without valid PEEP calibration	error
`V002`	ZERO POS INVALID	Light barrier crossing at bottom vent not detected	error
`V037`	EX VALVE LEAK	Greater than 15 mL tidal volume leak during inspiration	warning
`V042`	Motor Voltage Error	Motor voltage dropped below minimum during auto ventilation	error
`V043`	MOTOR LIM STOP	Excessive motor current during auto ventilation	error
`V044`	MEMBRANE PRES LOW	Membrane vacuum below normal range	warning
`V045`	MEMBRANE PRES HIGH	Membrane vacuum above normal operating range	warning
`V049`	MOTOR OVER CUR-RENT	Persistent excessive motor current during auto ventilation	critical
`V050`	LT Pres Failed>350	Leak in ventilator pathway detects pressure >350	error
`V051`	LT Pres Rose>250	Leak in ventilator pathway detects pressure >250	error
`V052`	LT SYS FAIL	System leak test failed in complete pathway	error
`V053`	LT PC FAIL	Leak in patient circuit detected	error
`V060`	Comp Unexp State	Compliance test entered unexpected state	error
`V061`	Comp Bag Pres Too High	Compliance test start pressure too high	error
`V062`	Comp Cant Fully Pres	Compliance test cannot reach full pressurization	error
`V063`	Comp Cant Hold Pres	Compliance test cannot maintain plateau pressure	error
`V064`	COMP Cant DePres	Pressure not dropping during compliance test	error
`V065`	COMP Inv Pres	Pressure changing in wrong direction during compliance test	error
`V066`	COMP Inv Pres	Pressure changing in wrong direction during compliance test	error
`V067`	COMP Sys < VentHose	Irregular compliance test results	warning
`V069`	Comp Unexpected Error	Compliance test entered unexpected error state	error
`V070`	COMP Sys Fail in Range	Unusable compliance value in expected range	error
`V071`	COMP Sys Fail out of Range	Unusable compliance value out of range	error
`V072`	COMP VH Fail in Range	Unusable vent hose compliance value in range	error
`V073`	COMP VH Fail out of Range	Unusable vent hose compliance value out of range	error
`value not stored`	O2 calibration value not saved	O2 zero calibration process fails	error
`WD00`	Watch dog time exp	Watchdog timer expired	critical

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.