Prest-O-Lite 250 Manuel D'instructions, D'installation, D'utilisation Et D'entretien page 31

SECTION 5
C. Air does not shut off
Does arc start when nozzle contacts work without depressing torch switch?
Yes
Check for short in torch switch or torch switch leads
Does air flow even when Prest-O-Lite
Yes
Replace
solenoid valve
No
® 250 power switch is OFF?
No
Repair/replace
control PCB
31
TrOUBlESHOOTING