ESAB PCM-500i Instruction Manual page 22

SECTION 5
C. Air does not shut off
Is air check switch OFF?
Yes
Does arc start when nozzle contacts work without depressing torch switch?
Yes
Check for short in torch switch
Does air flow even when PCM-500i power switch is OFF?
Yes
Replace
solenoid valve
22
No
No
No
Repair power
source
TROUBLESHOOTING
Turn switch OFF