Acquity UPLC H-Class Accumulator B Leaking Entirely to Seal Wash
Hi! I'm a graduate student searching for answers for why the accumulator for our UPLC leaks all solvent to the seal wash (red circle). Normally our system runs at ~10000 psi but currently maxes out at ~200-300 psi. If I separate pump B/accumulator from the line, pump A works fine but when they are connected, both pumps exclusively leak into the seal wash from accumulator B.
To ensure it isn't due to anything with the seals I've swapped all the pump head seals and seal wash housing with accumulator A. The pump I swapped everything with still works but accumulator B still leaks everything.
I have a feeling it has to do with the plunger and how it sits within the seal wash housing. However, I swapped out the plunger and there was no change. The old plunger had no build up of salts or anything as we only use H2O and ACN. I've noticed there are periodic air bubbles in the seal wash which could be due to air getting in the system with each plunge of the plunger. However, the leak to seal wash is still the main issue I think.
Sorry for the rambling info. I've gotten help from the most knowledgeable people on our campus and called Waters support services but we haven't been able to fix it, so I'm running out of ideas on what to do. I'd greatly appreciate any advice from anyone with ideas about what might be wrong!