DHA1 : No Stall Error - Pump A

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Pump A (DHA1) or Pump B (DHB1) does not stall in either direction during the pump calibration and stall test (keeps moving when dosing valve is closed).

Displacement pump is not seating properly

Rebuild displacement pump and replace packings, balls, and seats

Dispense valve not seating/ sealing

Replace needle/seat on dispense valve