Test equipment centrifuges

Hettich EBA 280: troubleshooting and error codes

The ServiceForge knowledge base holds 9 documented symptoms for the Hettich EBA 280, with 28 ranked causes, 24 diagnostic checks with test points and expected values, and 87 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 has no display high voltage

No display appears on the control panel after power-on. Yellow LED on electronics may not be illuminated.

Ranked causes

1. No mains voltage supplied to unit (common)
2. Mains input fuses F1, F2 defective (common)
3. Mains switch in appliance plug defective (occasional)
4. Electronics A3 defective (occasional)
5. Electronics A1 defective (occasional)
6. Control panel A2 defective (rare)

First check

Check building electrical installation

Test point: In-house fuses
Expected: Intact

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

OVER SPEED 5 – Overspeed detected patient safety

Speed measurement on control panel detects rotor exceeding maximum permitted speed. Rotor coasts down unbraked until standstill. No further operation possible until error clears.

Ranked causes

1. Loose contact on plug S505 at electronics A1 (common)
2. Loose contact on plug S501 at electronics A1 (common)
3. Electronics A1 defective (occasional)
4. Control panel A2 defective (occasional)

First check

Perform mains reset after rotor stops

Test point: Mains switch
Expected: Rotor at standstill before reset

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

TACHO ERROR 1 during centrifugation run

Control panel loses tachometer pulses from speed sensor during centrifugation. Motor speed becomes undetectable. Error clears after rotor stops and mains reset is performed.

Ranked causes

1. Speed sensor B1 defective or loose contact (common)
2. Loose contact on plug S501 (common)
3. Control panel A2 defective (occasional)
4. Electronics A1 defective (occasional)

First check

Perform mains reset

Test point: Mains switch
Expected: Rotor standstill and lid locked symbol displayed

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

TACHO ERROR 2 after start command

After start command, control panel receives no tachometer pulses from speed sensor. Motor does not indicate rotation. Error clears after rotor stops and mains reset is performed.

Ranked causes

1. Speed sensor B1 defective or loose contact (common)
2. Loose contact on plug S501 (common)
3. Control panel A2 defective (occasional)
4. Electronics A1 defective (occasional)

First check

Perform mains reset

Test point: Mains switch
Expected: Rotor standstill and lid locked symbol displayed

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

ROTOR ERROR 10.2 – Invalid rotor code read patient safety

Unrecognized or invalid rotor code detected during startup. Rotor brakes immediately and coasts to standstill. No further operation possible. Error may indicate wrong rotor installed or motor direction incorrect. Error clears after mains reset.

Ranked causes

1. Magnet coding on rotor defective (common)
2. Motor rotating in wrong direction (occasional)
3. Electronics A1 defective (occasional)

First check

Perform mains reset

Test point: Mains switch
Expected: Rotor at standstill, error remains

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

LID ERROR 4.1 – Lid not locked patient safety

Lid lock is not actuated or jams during locking operation. Lid remains unlocked and centrifugation cannot start. Error clears after mains reset.

Ranked causes

1. Lid lock A4 defective (common)
2. Electronics A1 defective (occasional)

First check

Perform mains reset

Test point: Mains switch
Expected: Lid lock attempts to engage after reset

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

LID ERROR 4.5 – Microswitch opens during centrifugation patient safety

Microswitch in lid lock opens prematurely during centrifugation run, interrupting operation. Typically caused by manual emergency unlock during run or defective microswitch. Error clears after mains reset.

Ranked causes

1. Emergency unlock performed by hand during run (occasional)
2. Lid lock A4 defective (occasional)

First check

Perform mains reset

Test point: Mains switch
Expected: Centrifugation resumes normally

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

ROTOR ERROR 10.1 – Start code not recognized patient safety

Rotor code magnet start pulse not recognized during startup. Rotor brakes down to standstill. No further operation possible except lid unlock. Operator must determine rotor status before restart. Error clears after mains reset.

Ranked causes

1. Magnet coding on rotor defective (common)
2. Electronics A1 defective (occasional)

First check

Perform mains reset

Test point: Mains switch
Expected: Rotor at standstill

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

LID ERROR 4.4 – Lid lock jams during locking patient safety

Lid lock mechanism encounters resistance or jam when attempting to lock. Lid lock stalls before fully engaging. Error clears after mains reset.

Ranked causes

1. Lid lock A4 defective (common)

First check

Perform mains reset

Test point: Mains switch
Expected: Lid lock disengages smoothly

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

Error codes

Code	Meaning	Trigger	Severity
`COM ERROR 31`	Frequency converter serial interface communication failure	No connection between frequency converter on electronics A1 and serial interface	error
`COM ERROR 31, COM ERROR 33, COM ERROR 34, COM ERROR 36, FC E`	Communication error with frequency converter	Serial interface communication failure between control panel A2 and electronics A1	error
`COM ERROR 33`	Communication error between control panel and frequency converter	No correct data transmission between control panel A2 and frequency converter on electronics A1	error
`COM ERROR 34`	Communication error between control panel and frequency converter	No correct data transmission between control panel A2 and frequency converter on electronics A1	error
`COM ERROR 36`	No response (NAK) from frequency converter to control panel	Frequency converter on electronics A1 does not acknowledge (sends NAK) command from control panel A2	error
`CRC-ERROR 27`	CRC error after Power On	Cyclic redundancy check fails immediately after power-on	critical
`CRC ERROR 27.1`	CRC error at standstill	Cyclic redundancy check fails when rotor is at standstill	error
`CRC ERROR 27, CRC ERROR 27.1`	ROM read error	Program memory checksum failure	critical
`CRTL-ERROR 22`	I2C bus communication error	Communication error detected on I2C bus between control panel and electronics	error
`CRTL-ERROR 25.1`	EEPROM read error	Electronics A1 cannot read data from EEPROM memory	error
`CRTL-ERROR 25.3`	EEPROM communication error	Communication with EEPROM memory fails	error
`CRTL-ERROR 25.4`	EEPROM memory error	EEPROM memory reports error condition or data corruption detected	error
`CTRL ERROR 22`	Communication error between control panel and EEPROM	Control panel A2 cannot communicate with memory IC6	error
`CTRL ERROR 25.1, CTRL ERROR 25.2, CTRL ERROR 25.3, CTRL ERRO`	EEPROM read or memory error	Memory malfunction on control panel	critical
`CTRL ERROR 25.2`	EEPROM write error	Electronics A1 cannot write data to EEPROM memory	error
`FC ERROR 60`	Faulty enable signal to frequency converter	Frequency converter does not receive valid enable signal from electronics A1	error
`FC ERROR 60, FC ERROR 61.16`	Enable signal transmission error to frequency converter	Frequency converter does not receive enable command	critical
`FC ERROR 61.1`	Intermediate circuit undervoltage	DC voltage in power supply intermediate circuit too low	critical
`FC ERROR 61.1`	Frequency converter undervoltage error	DC supply voltage to frequency converter drops below minimum operating threshold	error
`FC ERROR 61.10`	Frequency converter overcurrent error	Output current from frequency converter to motor exceeds maximum safe level	critical
`FC ERROR 61.128`	Internal error of frequency converter	Frequency converter internal diagnostic detects malfunction	error
`FC ERROR 61.129`	Internal error of frequency converter	Frequency converter internal diagnostic detects malfunction or error condition	error
`FC ERROR 61.13`	Frequency converter overcurrent error	Output current from frequency converter to motor exceeds maximum safe level during operation	critical
`FC ERROR 61.131`	Internal error of frequency converter	Frequency converter internal diagnostic detects fault condition	error
`FC ERROR 61.132`	Internal error of frequency converter	Frequency converter internal diagnostic detects malfunction	error
`FC ERROR 61.140`	Internal error of frequency converter	Frequency converter internal diagnostic detects error condition	error
`FC ERROR 61.141`	Internal error of frequency converter	Frequency converter internal diagnostic detects malfunction	error
`FC ERROR 61.142`	Internal error of frequency converter	Frequency converter internal diagnostic detects fault or malfunction	error
`FC ERROR 61.153`	Imbalance detection system not working	Imbalance sensor magnet or Hall sensor malfunction	warning
`FC ERROR 61.154`	Invalid machine version detected	Frequency converter detects incorrect or unrecognized centrifuge model code	error
`FC ERROR 61.16`	Faulty enable signal to frequency converter	Frequency converter does not receive valid enable signal from electronics A1	error
`FC ERROR 61.17`	Communication error between control panel and frequency converter	No communication or lost communication between control panel A2 and frequency converter on electronics A1	error
`FC ERROR 61.18`	Incorrect motor rotation direction	Frequency converter detects motor rotation in wrong direction (reverse of commanded)	error
`FC ERROR 61.19`	Frequency converter detects overspeed	Motor speed monitored by frequency converter exceeds maximum safe operating threshold	error
`FC ERROR 61.19, FC ERROR 61.20`	Overspeed or speed measurement fault	Rotor speed exceeds limit (61.19) or speed sensor malfunction (61.20)	critical
`FC ERROR 61.2`	Intermediate circuit overvoltage	DC voltage in power supply intermediate circuit exceeds limit	critical
`FC ERROR 61.2`	Frequency converter overvoltage error	DC supply voltage to frequency converter exceeds maximum operating threshold	error
`FC ERROR 61.20`	Faulty speed measurement by frequency converter	Speed measurement signal from frequency converter is invalid or out of range	error
`FC ERROR 61.21`	Frequency converter detects underspeed	Motor speed monitored by frequency converter falls below minimum operating threshold	error
`FC ERROR 61.21`	Motor underspeed detected by frequency converter	Motor cannot maintain programmed speed	critical
`FC ERROR 61.23`	Speed measurement faulty	During centrifugation run, speed measurement on electronics A1 detects impermissible speed deviation	error
`FC ERROR 61.4`	Frequency converter overtemperature error	Frequency converter internal temperature exceeds safe operating limit	error
`FC ERROR 61.5`	Motor overtemperature detected	Temperature sensor in motor M1 opens due to excessive heat	critical
`FC ERROR 61.64`	Internal error of frequency converter	Frequency converter internal diagnostic detects malfunction or software error	error
`FC ERROR 61.64, FC ERROR 61.128, FC ERROR 61.129, FC ERROR 6`	Internal frequency converter errors	Various internal faults detected by frequency converter	critical
`FC ERROR 61.9`	Frequency converter overcurrent error	Output current from frequency converter to motor exceeds maximum safe level	critical
`FC ERROR 61.9, FC ERROR 61.10, FC ERROR 61.13`	Internal frequency converter error or motor short circuit	Frequency converter detects fault condition or short in motor winding	critical
`FC VERSION ERROR`	Wrong electronics A1 installed	Control panel detects electronics A1 model or version incompatible with centrifuge	error
`IMBALANCE`	Rotor imbalance detected	Rotor vibration exceeds allowed threshold during run	warning
`KEYBOARD ERROR`	Membrane keyboard malfunction	Keyboard not detected or unresponsive	warning
`KEYBOARD ERROR`	No or poor keyboard contact; keyboard not connected	Control panel cannot communicate with keyboard interface or detects contact fault	warning
`LID ERROR 4.1`	Lid lock error – lid not locked	Lid lock is not actuated or jams during locking	warning
`LID ERROR 4.10`	Unknown lid lock type	Lid lock type not recognized by control panel during initialization	warning
`LID ERROR 4.126`	Microswitch opens during centrifugation run	Microswitch in lid lock opens prematurely during active centrifugation	warning
`LID ERROR 4.127`	Lid lock error – lid not locked	Lid lock is not actuated or jams during locking	warning
`LID ERROR 4.2`	Lid lock error – lid lock not actuated	Lid lock does not respond to actuation command	warning
`LID ERROR 4.3`	Lid lock error – lid lock not actuated	Lid lock does not respond to actuation command	warning
`LID ERROR 4.4`	Lid lock jams during locking	Lid lock encounters mechanical resistance or jam when attempting to lock	warning
`LID ERROR 4.5`	Microswitch opens during centrifugation run	Microswitch in lid lock opens prematurely during active centrifugation	warning
`LID ERROR 4.6`	Lid lock jams during unlocking	Lid lock encounters resistance or jam when attempting to unlock	warning
`LID ERROR 4.7`	Lid lock jams during unlocking	Lid lock encounters resistance or jam when attempting to unlock	warning
`LID ERROR 4.8`	Microswitch opens during centrifugation run	Microswitch in lid lock opens prematurely during active centrifugation	warning
`LID ERROR 4.9`	Lid lock jams during unlocking	Lid lock encounters resistance or jam when attempting to unlock	warning
`MAINS INTER 11`	Mains interruption during centrifugation run	AC mains power supply is lost or interrupted while rotor is spinning	warning
`MAINS INTERRUPT`	Mains interruption during centrifugation run	AC mains power supply is lost or interrupted while rotor is spinning	warning
`MAINS INTERRUPT, MAINS INTER 11`	Mains power interruption during run	AC power loss during centrifugation	critical
`OVER SPEED 5`	Overspeed detected by control panel	Control panel speed measurement detects rotor exceeding maximum permitted speed	error
`ROTOR ERROR 10.1`	Start code not recognized; rotor coding start pulse lost	Rotor code magnet start pulse not detected during startup	error
`ROTOR ERROR 10.2`	Invalid rotor code detected during startup	During start-up, invalid or unrecognized rotor code is read in	error
`ROTOR ERROR 10.3`	Code magnet lost	Rotor code magnet becomes detached or displaced from holder during operation	critical
`ROTOR ERROR 10.3`	Error reading the rotor code	Rotor code not detected during operation	error
`ROTOR ERROR 10.4`	Error reading the rotor code track	Rotor code track not detected	error
`ROTOR ERROR 10.4`	Code track malfunction	Hall sensor cannot read rotor code track properly	error
`ROTOR ERROR 10.5`	Code track failed during centrifugation	Rotor code track becomes unreadable after centrifugation has started	critical
`ROTOR ERROR 10.6`	Rotor code detection timeout after start	Rotor code not detected within timeout period after startup	error
`RPM > ROTOR MAX`	Speed exceeds rotor maximum rated speed	Activated program sets speed higher than maximum rated speed for installed rotor	warning
`RXXX WRONG ROTOR`	Rotor not approved for this device	Incompatible rotor detected (xxx is rotor code)	warning
`TACHO ERR 61.22`	Frequency converter receives no speed pulses	During centrifugation run, electronics A1 frequency converter no longer receives tachometer pulses from speed sensor B1	error
`TACHO ERROR 1`	Speed pulse failure during centrifugation run	Control panel loses tachometer pulses from speed sensor B1 after centrifugation has started	error
`TACHO ERROR 2`	No speed pulses after start command	After centrifugation start command, control panel A2 receives no tachometer pulses	error
`TACHO ERROR 96.1`	Speed difference exceeds 10% between frequency converter and control panel	Speed measurement from frequency converter differs from control panel reading by more than 10%	warning
`TACHO ERROR 96.1`	Speed measurement discrepancy between systems	Speed measurement from electronics A1 and control panel A2 differ by >10%	warning
`UNDER SPEED 13`	Rotor running below programmed speed	Speed measurement below setpoint	error
`UNDER SPEED 13`	Underspeed detected by control panel	Control panel speed measurement detects rotor running below required speed threshold	error
`VERSION ERROR 12`	Incorrect centrifuge model recognized	Control panel detects centrifuge model version mismatch or unrecognized model	error
`VERSION ERROR 12`	Control panel and electronics version mismatch	Centrifuge model/type saved on A2 does not match electronics A1	error
`WATCHDOG RESET`	Internal error of control panel watchdog timer	Control panel watchdog timer triggers reset due to internal malfunction or hang	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.