DH01 : No Stall Pump

The number on the end of the error code refers to which pump is having the issue.  For example DH0#.

Pump failed the stall test; did not stall on either the upstroke or the downstroke.

  • Replace inlet and outlet valve and seal for up and down strokes. 
  • Replace piston and throat seals. 
  • Replace rod and cylinder as necessary.