Troubleshooting - Unitor UPC 838 Owner's Manual

6-4. Troubleshooting

Trouble
No pilot arc; difficulty in establishing an
arc.
No cutting output; Power light off;
Trouble lights off; Ready light off; fan mo-
tor FM does not run.
Pilot arc working; no cutting output; Pow-
er light on; Ready light on; Trouble lights
off; fan motor running.
No gas/air flow; Power light on; Ready
light on; Trouble lights off; fan motor
running.
Pressure Trouble light On; Ready light
off.
Cup Trouble light On; Ready light off.
Temperature Trouble light On; Ready
light off.
Trouble lights not working.
Power light flashing, Trouble lights off.
OM-202 515 Page 22
Clean or replace worn consumables as necessary (see torch Owner's Manual).
Check for damaged torch or torch cable (see torch Owner's Manual).
Place Power switch in On position.
Place line disconnect device in On position (see Section 4-7).
Check line fuse(s) and replace if needed or reset circuit breakers (see Section 4-7).
Be sure work clamp is connected.
Clean or replace worn consumables as necessary (see torch Owner's Manual).
Have Factory Authorized Service Agent check for proper torch connections. Check operation of gas
valve GS1, and check gas/air system for leaks.
Check for correct gas/air pressure adjustment (see Section 5-2).
Check for sufficient gas/air supply pressure (see Section 4-5).
Check for dirty air filter/regulator and clean, if needed (see manufacturer's instructions).
Check air lines for leaks.
Have Factory Authorized Service Agent check pressure switch and control board.
Check torch shield cup (see Section 6-3). Reset power switch.
Have Factory Authorized Service Agent check for proper torch connections.
Inverter heat sink or output heat sink overheating. Allow fan to run; the Trouble light goes out when the
unit has cooled.
Have Factory Authorized Service Agent check control board.
Have Factory Authorized Service Agent check unit.
Reset power switch.
Remedy