Disclaimer: Attempting repairs without proper training can void the warranty and cause damage to the device.
Check for mechanical obstructions in the latch receiver. Use a multimeter to test continuity across the lid microswitches when the latch is engaged. Replace the lid latch assembly if the microswitch fails to close circuit loops. Error 18 / Error 19 (Refrigeration / Temperature Error) Eppendorf Centrifuge 5424 R Service Manual
Inspect the lid seal for damage. A damaged seal causes improper cooling and ice buildup. Replace the lid latch assembly if the microswitch
: Schedules for cleaning ventilation slits (every 6 months) and inspecting internal components like gas struts and lid lock switches. : Schedules for cleaning ventilation slits (every 6
| Error Code | Symptom / Message | Typical Cause | Recommended Remedy | | :--- | :--- | :--- | :--- | | | Lid cannot be locked. | User error. | Try to close the centrifuge lid again. | | LID ERROR | Lid cannot be released. | Software glitch. | Switch device off and on again, then press the open key. If error persists, use the emergency lid release. | | LID LIFT (5424 R) | Lid not opened wide enough. | Mechanical obstruction. | Open the centrifuge lid wider by hand. | | NO RPM | Error in speed measuring system. | Electronic glitch. | Leave the device switched on for 10 seconds or up to 6 minutes until the error clears. | | Err 6 | Drive error / Drive overheated. | Overload or thermal event. | Repeat the run. If error reoccurs, power cycle after >20s. For overheating, allow drive to cool for ≥15min. | | Err 7 | Deviation in speed control. | Rotor not tightened. | Wait for rotor stop, then tighten the rotor firmly. | | Err 9–17 | Electronic system error. | Electronics. | Switch the centrifuge off and back on after >20 seconds. | | Err 18 (5424 R) | High temperature variation. | Airflow blocked / ice buildup. | Check vents and settings. Thaw ice or switch off to cool down. | | Err 19, 24 (5424 R) | Cooling circuit overheated / fault. | Poor ventilation / overheating. | Check air circulation, clear vents, and allow unit to cool down. | | Err 20, 21 (5424 R) | Temperature sensor faulty. | Hardware failure. | Power cycle the centrifuge after >20 seconds. If error persists, contact service. | | Shaking on Startup | Imbalance. | Rotor loaded asymmetrically. | Stop, reload symmetrically, and restart the device. |
Chamber does not reach the target temperature, or overheats.
Clean and lightly lubricate the rotor tie-down nut threads using specialized centrifuge lubricant. Check the rubber lid seal for cracks or deformities. Annual Routine Verify speed accuracy using a calibrated photo-tachometer.