ACQUITY UPLC shows high/overpressure on all columns - WKB93204

SYMPTOMS

• High start pressure.
• Overpressure during run.

ENVIRONMENT

• ACQUITY UPLC 
• ACQUITY UPLC H-Class
• ACQUITY Column Manager
• ACQUITY Sample Manager

CAUSE

Partially blocked or completely blocked tubing between sample manager injection pod and column manager high pressure side valve.        

FIX or WORKAROUND

1. Replace tubing assembly from SM Inject Valve to CMA Inlet. Part number is 700005479 (H-class, left inlet),  430001722 (ACQUTITY UPLC, right inlet). 
2. Inspect system pressure.
3. Perform test injections (according to customer rules).

ADDITIONAL INFORMATION

For left inlet: Tube Assembly, Left Inlet, SM Injection Valve (430001782)