Test equipment centrifuges

Hettich MIKRO 185: troubleshooting and error codes

The ServiceForge knowledge base holds 67 documented symptoms for the Hettich MIKRO 185, with 158 ranked causes, 122 diagnostic checks with test points and expected values, and 83 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

No display high voltage

Display is not illuminated. No output on screen.

Ranked causes

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

First check

Verify mains power at outlet

Test point: House electrical outlet
Expected: Mains voltage present

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

FC ERROR 61.153 caution

Imbalance system not in working order.

Ranked causes

1. No magnet holder fastened to motor for imbalance detection (common)
2. Magnet defective or missing from holder (common)
3. Magnet holder misaligned above hall sensor (occasional)
4. Electronics A1 defective (occasional)
5. Motor bearings so damaged magnet no longer above sensor (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

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

FC ERROR 61.19 patient safety

Frequency converter detects overspeed; braked rundown until rotor stops; device inoperable.

Ranked causes

1. Loose contact on plug S602 or S504 (common)
2. Insulation damaged on speed sensor B1 cable (occasional)
3. Loose contact on plug S601 or S501 (occasional)
4. Control panel A2 defective (occasional)
5. Electronics A1 defective (occasional)

First check

Wait for rotor to stop completely and check lid locked symbol

Test point: Display and rotor
Expected: Rotor stationary and lid locked symbol showing

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

FC ERROR 61.20 patient safety

Speed measurement of frequency converter is faulty on electronics A1; braked rundown until rotor stops; device inoperable.

Ranked causes

1. Loose contact on plug S602 or S504 (common)
2. Insulation damaged on speed sensor B1 cable (occasional)
3. Loose contact on plug S601 or S501 (occasional)
4. Control panel A2 defective (occasional)
5. Electronics A1 defective (occasional)

First check

Wait for rotor to stop and verify lid locked symbol

Test point: Display and rotor
Expected: Rotor stopped and lid locked symbol displayed

1 more check with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

TACHO ERROR 1 patient safety

During centrifugation, control panel A2 loses speedometer pulses from speed sensor B1.

Ranked causes

1. Speed sensor B1 defective or loose contact (common)
2. Loose contact on plug S602 or S504 (common)
3. Loose contact on plug S601 or S501 (common)
4. Control panel A2 defective (occasional)
5. Electronics A1 defective (occasional)

First check

Wait for rotor to stop and check lid lock symbol

Test point: Display
Expected: Lid locked symbol displayed

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

TACHO ERROR 2 patient safety

After starting centrifugation, control panel A2 receives no speedometer pulses from speed sensor B1.

Ranked causes

1. Speed sensor B1 defective or loose contact (common)
2. Loose contact on plug S602 or S504 (common)
3. Loose contact on plug S601 or S501 (common)
4. Control panel A2 defective (occasional)
5. Electronics A1 defective (occasional)

First check

Wait for rotor to stop and check lid lock symbol

Test point: Display
Expected: Lid locked symbol displayed

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

COM ERROR 31 caution

Error in communication between control panel A2 and frequency converter on electronics A1 via serial interface.

Ranked causes

1. Loose contact on plug S601 or S501 (common)
2. Overtemperature switch in motor M1 open (occasional)
3. Electronics A1 defective (occasional)
4. Control panel A2 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

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

COM ERROR 36 caution

Error in communication between control panel A2 and frequency converter on electronics A1 via serial interface; overtemperature switch in motor may be open.

Ranked causes

1. Loose contact on plug S601 or S501 (common)
2. Overtemperature switch in motor M1 open (occasional)
3. Electronics A1 defective (occasional)
4. Control panel A2 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

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

FC ERROR 61.21 patient safety

Frequency converter detects underspeed; unbraked rundown until rotor stops; device inoperable.

Ranked causes

1. Motor sluggish due to bearing damage (common)
2. Motor winding short-circuit defective (common)
3. Electronics A1 defective (occasional)
4. Loose contact on plug S602 or S504 (occasional)

First check

Wait for rotor to stop and check lid locked symbol

Test point: Display and rotor
Expected: Rotor completely stopped and symbol showing

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

FC ERROR 61.23 patient safety

During centrifugation, speed measurement on electronics A1 detects impermissible speed deviation.

Ranked causes

1. Speed sensor B1 defective or loose contact (common)
2. Loose contact on plug S602 or S504 (common)
3. Loose contact on plug S601 or S501 (common)
4. Electronics A1 defective (occasional)

First check

Wait for rotor to stop and check lid lock symbol

Test point: Display
Expected: Lid locked symbol displayed

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

FC ERROR 61.5 caution

Overtemperature in motor M1; device can no longer be operated.

Ranked causes

1. Overtemperature switch in motor opens due to excessive motor temperature (common)
2. Loose contact on plug S101 / electronics A1 (occasional)
3. Electronics A1 defective (occasional)
4. Motor defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

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

IMBALANCE patient safety

Impermissible imbalance detected; braked rundown until rotor stops.

Ranked causes

1. Rotor unevenly loaded (common)
2. Three rubber/metal bearings on motor damaged (occasional)
3. Imbalance switch-off maladjusted (occasional)
4. Electronics A1 defective (rare)

First check

Wait for rotor to stop and verify lid locked symbol

Test point: Display and rotor
Expected: Rotor completely stopped and symbol displayed

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

No mains voltage present at device high voltage

Device does not power up; no status LED indication

Ranked causes

1. Installation fuses blown (common)
2. Centrifuge mains input fuses blown (common)
3. No power at connecting cable or plug (occasional)
4. Electronics A3 failure (MIKRO 185) (rare)

First check

Verify installation fuses intact

Test point: Building installation fuse box
Expected: Fuses intact and not blown

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

OVER SPEED 5 patient safety

Overspeed detected by speed measurement function on control panel A2; unbraked rundown until rotor stops.

Ranked causes

1. Loose contact on plug S602 or S504 (common)
2. Loose contact on plug S601 or S501 (common)
3. Electronics A1 defective (occasional)
4. Control panel A2 defective (occasional)

First check

Wait for rotor to stop

Test point: Rotor and display
Expected: Rotor completely stopped

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

TACHO ERR 61.22 patient safety

During centrifugation, electronics A1 loses speedometer pulses from speed sensor B1.

Ranked causes

1. Speed sensor B1 defective or loose contact (common)
2. Loose contact on plug S602 or S504 (common)
3. Loose contact on plug S601 or S501 (common)
4. Electronics A1 defective (occasional)

First check

Wait for rotor to stop and check lid lock symbol

Test point: Display
Expected: Lid locked symbol displayed

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

UNDER SPEED 13 patient safety

Underspeed detected by speed measurement function on control panel A2; unbraked rundown until rotor stops.

Ranked causes

1. Loose contact on plug S602 or S504 (common)
2. Loose contact on plug S601 or S501 (common)
3. Electronics A1 defective (occasional)
4. Control panel A2 defective (occasional)

First check

Wait for rotor to stop completely

Test point: Rotor
Expected: No rotation

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

COM ERROR 34 caution

Error in communication between control panel A2 and frequency converter on electronics A1 via serial interface.

Ranked causes

1. Loose contact on plug S601 or S501 (common)
2. Electronics A1 defective (occasional)
3. Control panel A2 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

FC ERROR 60 caution

Enable signal not correctly transmitted to frequency converter on electronics A1; device can no longer be operated.

Ranked causes

1. Loose contact on plug S601 or S501 (common)
2. Control panel A2 defective (occasional)
3. Electronics A1 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

FC ERROR 61.1 high voltage

Frequency converter error: Undervoltage in intermediate circuit; unbraked rundown until rotor stops; device can no longer be operated.

Ranked causes

1. Mains voltage too low (common)
2. Electronics A3 defective (occasional)
3. Electronics A1 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

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

FC ERROR 61.16 caution

Enable signal not correctly transmitted to frequency converter on electronics A1; device can no longer be operated.

Ranked causes

1. Loose contact on plug S601 or S501 (common)
2. Control panel A2 defective (occasional)
3. Electronics A1 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

FC ERROR 61.17 caution

Error in communication between control panel A2 and frequency converter on electronics A1 via serial interface.

Ranked causes

1. Loose contact on plug S601 or S501 (common)
2. Electronics A1 defective (occasional)
3. Control panel A2 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

FC ERROR 61.4 caution

Overtemperature in frequency converter on electronics A1; unbraked rundown until rotor stops; device inoperable.

Ranked causes

1. Heat dissipation from frequency converter to housing insufficient (common)
2. Full-load operation at ambient temperature > 45°C (common)
3. Electronics A1 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

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

MAINS INTER 11 caution

Mains interruption detected during centrifugation run; cannot be cleared with MAINS RESET.

Ranked causes

1. Mains voltage failure (common)
2. Loose contact in electrical lines (occasional)
3. Loose contact on plug S601 or S501 (occasional)

First check

Wait for rotor to stop completely

Test point: Rotor
Expected: No rotation

MAINS INTERRUPT caution

Mains interruption occurs during centrifugation run.

Ranked causes

1. Mains voltage failure (common)
2. Loose contact in electrical lines (occasional)
3. Loose contact on plug S601 or S501 (occasional)

First check

Wait for rotor to stop

Test point: Rotor
Expected: Rotor completely stopped

Motor does not start or run high voltage

Motor fails to operate; rotor does not spin up during centrifugation cycle initiation

Ranked causes

1. Installation fuses blown or open (common)
2. Centrifuge mains input fuses open (common)
3. No mains voltage at electronics (occasional)

First check

Verify installation facility fuses are intact

Test point: Facility main electrical panel
Expected: Fuses intact, no open circuits

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

FC ERROR 61.10 high voltage

Internal error of frequency converter on electronics A1; device can no longer be operated. Possible short-circuit in motor.

Ranked causes

1. Short-circuit in motor (common)
2. Electronics A1 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

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

FC ERROR 61.13 high voltage

Internal error of frequency converter on electronics A1; device can no longer be operated. Possible short-circuit in motor.

Ranked causes

1. Short-circuit in motor (common)
2. Electronics A1 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

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

FC ERROR 61.2 high voltage

Frequency converter error: Overvoltage in intermediate circuit (> 410 V DC); unbraked rundown until rotor stops; device inoperable.

Ranked causes

1. Mains voltage too high (common)
2. Electronics A1 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

1 more check with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

FC ERROR 61.9 high voltage

Internal error of frequency converter on electronics A1; device can no longer be operated. Possible short-circuit in motor.

Ranked causes

1. Short-circuit in motor (common)
2. Electronics A1 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

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

LED status indication not working or flashing error

Yellow status LED on centrifuge does not light during standby or run, or flashes continuously indicating unspecified error condition

Ranked causes

1. Specific error code active (see chapter 5) (common)
2. LED bulb or indicator circuit fault (occasional)

First check

Identify displayed error code or flash pattern

Test point: Centrifuge front panel yellow LED
Expected: Steady light (normal operation) or specific flash pattern (error)

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

Lid does not open after centrifugation patient safety

Motor-driven lid lock remains engaged and lid cannot be manually opened after rotor has stopped

Ranked causes

1. Rotor still rotating (standstill not detected) (occasional)
2. Lid lock microswitch failure or misalignment (rare)

First check

Confirm rotor has reached complete standstill

Test point: Rotor visual inspection or tachometer reading
Expected: Rotor not rotating; 0 rpm

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

Lid does not open when button pressed patient safety

Lid lock motor does not respond to open button command

Ranked causes

1. Rotor still spinning (common)
2. Lid lock microswitch failed or misaligned (occasional)

First check

Verify rotor standstill

Test point: Speed sensor B1 signal or electronics A1 display
Expected: Rotor speed = 0 rpm or standstill confirmed by electronics

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

LID ERROR 4.1 patient safety

Lid is not locked; lid lock is not actuated or jams during locking.

Ranked causes

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

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

LID ERROR 4.10 caution

Unknown lid lock type.

Ranked causes

1. Lid lock A4 defective (common)
2. Control panel A2 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

LID ERROR 4.126 patient safety

Microswitch in lid lock opens during centrifugation run.

Ranked causes

1. Emergency unlocking performed during centrifugation (common)
2. Lid lock A4 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

LID ERROR 4.127 patient safety

Lid lock not actuated or jams during locking.

Ranked causes

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

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

LID ERROR 4.5 patient safety

Microswitch in lid lock opens during centrifugation run.

Ranked causes

1. Emergency unlocking performed during centrifugation (common)
2. Lid lock A4 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

LID ERROR 4.8 patient safety

Microswitch in lid lock opens during centrifugation run.

Ranked causes

1. Emergency unlocking performed during centrifugation (common)
2. Lid lock A4 defective (occasional)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

Motor stops unexpectedly during centrifugation

Running motor suddenly decelerates and stops without operator input

Ranked causes

1. Excessive rotor imbalance detected (common)
2. Motor overtemperature detected (occasional)

First check

Observe centrifugation cycle and listen for abnormal vibration

Test point: Rotor and motor
Expected: Smooth quiet rotation without excessive vibration

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

Rotor imbalance detected during run caution

Motor switches off mid-centrifugation; rotor decelerates to stop due to detected imbalance exceeding permissible limits

Ranked causes

1. Rotor load unbalanced or improperly seated (common)
2. Imbalance detection sensor (Hall sensor) malfunction or magnet misalignment (rare)

First check

Verify rotor load is balanced and properly seated

Test point: Rotor bucket positions and sample tube arrangement
Expected: Load symmetric; all positions filled with equal mass or balancing counterweights

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

Status LED not illuminated

Yellow LED does not light up during standby or centrifugation run

Ranked causes

1. LED defective or not installed (occasional)
2. No power to LED circuit (common)

First check

Verify mains power present at electronics

Test point: Electronics module power input
Expected: Mains voltage present
Tools: Multimeter

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

Unit does not power on high voltage

No LED indication, no response to power switch

Ranked causes

1. Installation fuses blown or facility mains unavailable (common)
2. Centrifuge mains fuses open (common)

First check

Verify mains availability at facility

Test point: Building electrical panel
Expected: Facility fuses intact, mains available

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

VERSION ERROR 12 caution

Centrifuge model and type saved in control panel A2 do not match electronics A1.

Ranked causes

1. Incorrect centrifuge model or type in control panel A2 (common)
2. Control panel A2 defective (rare)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

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

Calibration: Functional check after repair high voltage

Verification of centrifuge operation following service work including key/display function, rotor performance, temperature control, imbalance detection, power consumption and electrical safety

Ranked causes

1. Post-repair verification required (common)

First check

Function of keys and display

Test point: Control panel
Expected: Keys responsive, display shows correct values during operation

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

Centrifugation will not start

Motor does not start when run button pressed despite mains power present

Ranked causes

1. Lid not closed or lid lock not engaged (common)

First check

Verify lid is fully closed and locked

Test point: Lid lock microswitch or electronics A1 lid status input
Expected: Lid lock engaged; microswitch closed; electronics confirm locked state

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

CRC ERROR 27.1 caution

ROM read error; device can no longer be operated.

Ranked causes

1. Control panel A2 defective (common)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

CTRL ERROR 25.1 caution

EEPROM read or memory error; device can no longer be operated.

Ranked causes

1. Control panel A2 defective (common)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

CTRL ERROR 25.2 caution

EEPROM read or memory error; device can no longer be operated.

Ranked causes

1. Control panel A2 defective (common)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

FC ERROR 61.128 caution

Internal error of frequency converter.

Ranked causes

1. Electronics A1 defective (common)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

FC ERROR 61.129 caution

Internal error of frequency converter.

Ranked causes

1. Electronics A1 defective (common)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

FC ERROR 61.131 caution

Internal error of frequency converter.

Ranked causes

1. Electronics A1 defective (common)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

FC ERROR 61.132 caution

Internal error of frequency converter.

Ranked causes

1. Electronics A1 defective (common)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

FC ERROR 61.140 caution

Internal error of frequency converter.

Ranked causes

1. Electronics A1 defective (common)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

FC ERROR 61.141 caution

Internal error of frequency converter.

Ranked causes

1. Electronics A1 defective (common)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

FC ERROR 61.142 caution

Internal error of frequency converter.

Ranked causes

1. Electronics A1 defective (common)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

FC ERROR 61.18 caution

Frequency converter receives incorrect direction of rotation command; device can no longer be operated.

Ranked causes

1. Control panel A2 defective (common)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared and correct rotation command sent

FC ERROR 61.64 caution

Internal error of frequency converter.

Ranked causes

1. Electronics A1 defective (common)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

Imbalance detected during centrifugation patient safety

Motor switches off and rotor brakes to stop when excessive vibration is detected during run-up, centrifuging or braking

Ranked causes

1. Excessive rotor imbalance during operation (common)

First check

Verify hall sensor on electronics A1 is functional

Test point: Hall sensor on electronics A1
Expected: Sensor detects magnet in motor holder

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

LED indication abnormal

LED flashes or does not respond as expected during operation or standby

Ranked causes

1. Error condition detected by electronics (common)

First check

Observe LED flash pattern

Test point: Yellow LED on electronics A3
Expected: Steady light in standby/run, specific flash pattern for errors

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

LID ERROR 4.2 patient safety

The lid lock is not actuated.

Ranked causes

1. Electronics A1 defective (common)

First check

Perform MAINS RESET

Test point: Control panel
Expected: Error cleared

More symptoms

LID ERROR 4.3
LID ERROR 4.4
LID ERROR 4.6
LID ERROR 4.7
LID ERROR 4.9
Motor overheats and shuts down
Status LED flashing with error indication

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

Error codes

Code	Meaning	Trigger	Severity
`COM ERROR 31`	Communication error between control panel A2 and frequency converter on electronics A1.	Serial interface communication fails.	error
`COM ERROR 34`	Incorrect data transmission between control panel and frequency converter	Data corruption or parity errors during communication	error
`COM ERROR 36`	No response from frequency converter to control panel	Frequency converter fails to acknowledge commands	error
`COM ERROR 36`	Communication error between control panel A2 and frequency converter; may involve motor overtemperature switch.	Serial interface communication fails; overtemperature switch may be open.	error
`CRC ERROR 27.1`	Control panel ROM error	ROM checksum verification failure	error
`CRC ERROR 27.1`	ROM read error in control panel; device inoperable.	Control panel ROM memory cannot be read or is corrupted.	critical
`CTRL ERROR 25.1`	EEPROM read or memory error in control panel; device inoperable.	Control panel EEPROM fails or cannot be read.	critical
`CTRL ERROR 25.1`	Control panel EEPROM error	EEPROM data corruption or read failure detected	error
`CTRL ERROR 25.2`	Control panel EEPROM error	EEPROM data corruption or read failure detected	error
`CTRL ERROR 25.2`	EEPROM read or memory error in control panel; device inoperable.	Control panel EEPROM memory failure.	critical
`FC ERROR 60`	Enable signal not correctly transmitted to frequency converter on electronics A1; device inoperable.	Enable signal transmission to frequency converter fails.	critical
`FC ERROR 61.1`	Frequency converter error: Undervoltage in intermediate circuit; unbraked rundown; device inoperable.	Intermediate circuit voltage drops below safe operating threshold.	critical
`FC ERROR 61.10`	Internal error of frequency converter on electronics A1; possible motor short-circuit; device inoperable.	Frequency converter detects internal fault.	critical
`FC ERROR 61.10`	Frequency converter overcurrent condition	Actual current through frequency converter exceeds rated maximum	critical
`FC ERROR 61.128`	Internal error of frequency converter	Converter detects unrecoverable internal fault	error
`FC ERROR 61.129`	Internal error of frequency converter	Converter detects unrecoverable internal fault	error
`FC ERROR 61.13`	Frequency converter overcurrent condition	Actual current through frequency converter exceeds rated maximum	critical
`FC ERROR 61.13`	Internal error of frequency converter on electronics A1; possible motor short-circuit; device inoperable.	Frequency converter internal fault detected.	critical
`FC ERROR 61.131`	Internal error of frequency converter	Converter detects unrecoverable internal fault	error
`FC ERROR 61.132`	Internal error of frequency converter	Converter detects unrecoverable internal fault	error
`FC ERROR 61.140`	Internal error of frequency converter	Converter detects unrecoverable internal fault	error
`FC ERROR 61.141`	Internal error of frequency converter	Converter detects unrecoverable internal fault	error
`FC ERROR 61.142`	Internal error of frequency converter	Converter detects unrecoverable internal fault	error
`FC ERROR 61.153`	Imbalance system not in working order; cannot detect imbalance.	Magnet, holder, or sensor alignment problem with imbalance detection circuit.	warning
`FC ERROR 61.153`	Imbalance detection system faulty in frequency converter	Imbalance sensor signal missing or malfunctioning	warning
`FC ERROR 61.16`	Enable signal not correctly transmitted to frequency converter on electronics A1; device inoperable.	Enable signal to frequency converter not transmitted properly.	critical
`FC ERROR 61.17`	No communication between control panel and frequency converter	Serial link dropout during operation	error
`FC ERROR 61.18`	Frequency converter receives incorrect direction of rotation command; device inoperable.	Direction of rotation signal is incorrect or invalid.	error
`FC ERROR 61.18`	Incorrect rotation direction command received by frequency converter	Frequency converter interprets wrong direction in command message	warning
`FC ERROR 61.19`	Overspeed detected by frequency converter	Measured speed exceeds programmed maximum limit	critical
`FC ERROR 61.19`	Frequency converter detects overspeed; braked rundown until rotor stops; device inoperable.	Rotor speed exceeds safe maximum during operation.	critical
`FC ERROR 61.2`	Frequency converter error: Overvoltage in intermediate circuit (> 410 V DC); unbraked rundown; device inoperable.	Intermediate circuit voltage exceeds 410 V DC.	critical
`FC ERROR 61.20`	Speed measurement of frequency converter is faulty on electronics A1; braked rundown; device inoperable.	Speed measurement from sensor fails or is inaccurate.	critical
`FC ERROR 61.21`	Underspeed detected by frequency converter	Measured speed falls below programmed minimum threshold	error
`FC ERROR 61.21`	Frequency converter detects underspeed; unbraked rundown until rotor stops; device inoperable.	Rotor speed falls below minimum safe operating speed.	critical
`FC ERROR 61.22`	Frequency converter not receiving speed pulses	Tachometer signal absent or too weak to detect	error
`FC ERROR 61.23`	Speed measurement faulty	Speed calculation error or sensor signal invalid	error
`FC ERROR 61.23`	Speed measurement on electronics A1 detects impermissible speed deviation during centrifugation.	Measured speed varies beyond allowable limits during operation.	error
`FC ERROR 61.4`	Frequency converter overtemperature	Internal temperature sensor exceeds safe limit in frequency converter	error
`FC ERROR 61.4`	Overtemperature in frequency converter on electronics A1; unbraked rundown; device inoperable.	Frequency converter internal temperature exceeds safe limit.	critical
`FC ERROR 61.5`	Overtemperature in motor M1; device can no longer be operated.	Motor temperature exceeds safe operating limit; overtemperature switch opens.	critical
`FC ERROR 61.64`	Internal error of frequency converter	Converter detects unrecoverable internal fault	error
`FC ERROR 61.9`	Frequency converter overcurrent condition	Actual current through frequency converter exceeds rated maximum	critical
`FC ERROR 61.9`	Internal error of frequency converter on electronics A1; possible motor short-circuit; device inoperable.	Frequency converter detects internal fault or motor winding short-circuit.	critical
`IMBALANCE`	Impermissible imbalance detected during operation; braked rundown until rotor stops.	Rotor vibration or imbalance exceeds safe operating threshold.	error
`IMBALANCE`	Imbalance detected on motor axis	Vibration sensor detects unbalanced load or mechanical imbalance	warning
`LID ERROR 4.1`	Lid lock error	Lid locking mechanism failure	warning
`LID ERROR 4.1`	Lid is not locked; lid lock not actuated or jams during locking.	Lid lock mechanism fails to engage or becomes stuck during locking attempt.	error
`LID ERROR 4.10`	Lid lock error	Lid locking mechanism failure	warning
`LID ERROR 4.10`	Unknown lid lock type detected by system.	Control panel unable to identify lid lock type.	warning
`LID ERROR 4.126`	Microswitch in lid lock opens during centrifugation run.	Microswitch opens unexpectedly during operation.	error
`LID ERROR 4.126`	Lid lock error	Lid locking mechanism failure	warning
`LID ERROR 4.127`	Lid lock not actuated or jams during locking.	Lid lock fails to operate or becomes stuck.	error
`LID ERROR 4.127`	Lid lock error	Lid locking mechanism failure	warning
`LID ERROR 4.2`	Lid lock error	Lid locking mechanism failure	warning
`LID ERROR 4.3`	Lid lock error	Lid locking mechanism failure	warning
`LID ERROR 4.4`	Lid lock error	Lid locking mechanism failure	warning
`LID ERROR 4.5`	Lid lock error	Lid locking mechanism failure	warning
`LID ERROR 4.5`	Microswitch in lid lock opens during centrifugation run.	Microswitch opens unexpectedly during active centrifugation.	error
`LID ERROR 4.6`	Lid lock jams during unlocking.	Lid lock becomes stuck when attempting to unlock.	error
`LID ERROR 4.6`	Lid lock error	Lid locking mechanism failure	warning
`LID ERROR 4.7`	Lid lock error	Lid locking mechanism failure	warning
`LID ERROR 4.7`	Lid lock jams during unlocking.	Lid lock mechanism stuck during unlock operation.	error
`LID ERROR 4.8`	Microswitch in lid lock opens during centrifugation run.	Microswitch opens during active centrifugation.	error
`LID ERROR 4.8`	Lid lock error	Lid locking mechanism failure	warning
`LID ERROR 4.9`	Lid lock error	Lid locking mechanism failure	warning
`LID ERROR 4.9`	Lid lock jams during unlocking.	Lid lock fails to unlock smoothly.	error
`MAINS INTER 11`	Mains interruption detected; cannot be cleared with MAINS RESET.	Power loss during centrifugation; error persists until manual intervention.	critical
`MAINS INTER 11`	Mains power interruption during centrifugation	Loss of main power during operation	warning
`MAINS INTERRUPT`	Mains power interruption detected during centrifugation run.	Power supply loss occurs during active centrifugation.	critical
`No display`	Display does not show any output	Unknown condition	error
`No display`	Display is not illuminated; no visual output on control panel.	Power applied but display remains blank.	critical
`OVER SPEED 5`	Overspeed condition	Centrifuge speed exceeds safe limit	critical
`OVER SPEED 5`	Overspeed detected by speed measurement function on control panel A2; unbraked rundown occurs.	Measured speed exceeds maximum safe operating speed.	critical
`OVER SPEED 5`	Centrifuge speed exceeds maximum safe limit	Actual speed exceeds programmed maximum	critical
`TACHO ERR 61.22`	Electronics A1 loses speedometer pulses from speed sensor B1 during centrifugation.	Speed signal lost during centrifuge operation.	error
`TACHO ERROR 1`	Control panel loses speedometer pulses during centrifugation from speed sensor B1.	Speed signal lost during active centrifuge run.	error
`TACHO ERROR 2`	Control panel receives no speedometer pulses after centrifuge start.	No speed signal detected immediately after starting centrifugation.	error
`UNDER SPEED 13`	Centrifuge fails to reach minimum operating speed	Actual speed below programmed minimum after acceleration period	error
`UNDER SPEED 13`	Underspeed condition	Centrifuge speed falls below minimum during operation	error
`UNDER SPEED 13`	Underspeed detected by speed measurement function on control panel A2; unbraked rundown occurs.	Measured speed falls below minimum required operating speed.	critical
`VERSION ERROR 12`	Incorrect centrifuge model recognized by control system	Model mismatch during system initialization	error
`VERSION ERROR 12`	Centrifuge model and type in control panel A2 do not match electronics A1.	System detects model/type mismatch at startup or during operation.	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.