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

  • Make sure the air compressor is capable of supplying the minimum air flow requirement for your system (see Technical Specifications in manual, for more information).
  • Make sure the air inlet pressure gauge reads 100-150 psi (6.8–10.3 bar, 0.68–1.03 MPa).
  • If the gauge does not read 100–150 psi, check the air compressor for proper setup (consult your air compressor manual, see Related Manuals in manual).
  • Disassemble the main air regulator and check for obstructions. 
  • Replace or repair parts as necessary (see Parts, in manual).
  • Actuate the blast control switch and check for proper spool valve actuation in the 4-way solenoid valve.
    • If no actuation occurs, check the blast control switch and twin-line by disconnecting the yellow tube at the enclosure male quick disconnect and engage the control switch.
    • If no air comes from the fitting, check for signal air at the blast control switch.
    • Replace the pneumatic blast control switch if signal air does not pass through the valve when the handle is depressed.
  • If the switch is functioning, ensure that the yellow tubing inside the control box is properly connected and clear any obstructions.
  • If the tubing is clean, replace the 4-way solenoid valve.