While the blast control switch is engaged, the blast air flow is fluctuating.

  • Make sure the compressor meets minimum flow requirements and is operating properly.
  • See Technical Specifications in manual for more information.
  • 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.