R4: Ratio High Error

The mix ratio is higher than the set tolerance for an A to B component volume comparison.


  • Check that the system is fully loaded with material. 
  • Check that the supply pump’s cycle rate is set properly. 
  • Check that the spray tip/nozzle is properly sized for the flow and application, and that it is not worn. 
  • Check that the fluid regulator is set properly.

Restrict gun needle travel to slow down the initial fluid delivery rate until fluid hoses are loaded with material.

Adjust component A and B fluid supply regulator pressures until they are about equal. If the pressures are already about equal, verify that component A and B dose valves are operating properly.