The blast control is not engaged, but blasting still occurs.

  • Make sure the compressor is capable of supplying the minimum air flow requirement for your system (see technical specifications in the manual).
  • Make sure the air inlet pressure gauge reads 100-175 psi (6.8-12 Bar, 0.68-1.2 MPa).
  • If the gauge does not read 100-175 psi, check the air compressor for proper setup.
  • Disassemble the main air regulator and check for obstructions.  
  • Replace or repair parts as necessary.
  • Unplug the hose cable at the control box.
    • If the blast stops, inspect the hose cable for shorted wiring.
    • Check continuity through the electric blast control switch (the switch is normally open).
    • Check for continuity across the connectors of the recessed plugs on the control box (there should be no continuity).
  • If all above items are functional, replace the 4-way solenoid valve.
  • Engage the Emergency Stop.
  • If blasting stops, check the blast control switch by disconnecting the yellow tube at the enclosure male quick disconnect.
    • There should be no air signal unless you engage the blast control switch.
  • If the switch is functioning, remove the exhaust mufflers from the 4-way and check for debris, clean ports, and replace the mufflers if necessary.
  • If all above items are functional, replace the 4-way solenoid valve.