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 the manual for more information of flow requirements.
  • Disassemble the main air regulator and check for obstructions.
  • Replace or repair parts as necessary.
  • Ensure proper 12V DC supply is connected, and at full charge.
  • Inspect cable for damaged or open wiring.
  • Check 3A fuse and replace if necessary.
  • Check for continuity through connectors on the control box and all external cables.
  • Check continuity thought the electric blast control switch (the switch is normally open).
  • If all above items are functional, replace the 4-way solenoid valve.
  • Actuate the blast control switch and check for proper spool valve actuation in the 4-way 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 the pneumatic blast control filter.
  • If the filter is clean, 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, make sure the yellow tubing inside the control box is properly connected and is clear of obstructions.
  • If the tubing is clean and connected, replace the 4-way solenoid valve.