"Pump X: Pump homing error" on I-Class BSM - WKB15365

SYMPTOMS

• "Pump X: Pump homing error" message causes run to abort
• The error message "Pump X: Pump HW overpressure" may be seen in combination
• Pump h/w motor lost synchronization (X) errors
• Resetting the module does not clear the error
• Loosening the tubing between the pump head and the vent valve cartridge and resetting the module solves the issue temporarily
• The Service profile indicates an "excessive restriction" on the "faulty" pump

ENVIRONMENT

• ACQUITY UPLC I-Class
• ACQUITY UPLC BSM
• Acquity H-class
• UPC2
• Acquity Premier

CAUSE

Likely, a temporary blockage/clog in the solvent manager plumbing, between the pump head and vent valve cartridge and/or pumps causes a rapid spike in pressure, triggering the errors.

FIX or WORKAROUND

1. Prime solvent line X.
2. Start the flow on the suspected faulty side X.
3. Inspect tubings and fittings for blockage/damage between the pump heads and the vent valve cartridge.
4. Replace the clogged tubing (for I-Class BSM, tubings can be found here) if the clog cannot be flushed.
5. Perform the DLT to confirm functionality of the pumps.

ADDITIONAL INFORMATION

If the error repeats, suspect a clogged/blocked vent valve cartridge (700006052).