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7-8. Troubleshooting Power Source
Trouble
No pilot arc; difficulty in establishing an
arc.
No cutting output; Power light off; status
lights off; fan motor FM does not run.
Pilot arc working; no cutting output;
Power light on; status lights off; fan
motor running.
No gas/air flow; Power light on; status
lights off; fan motor running.
Pressure status light On.
Cup status light On.
Temperature status light On.
Status lights not working.
Power light flashing, status lights off.
Pressure status light flashes.
Cup status light flashes.
Short tip life.
7-9. Troubleshooting Torch
Trouble
Arc goes on and off while cutting.
Arc goes out while cutting.
Sparks come out top of cut or cut is not
clean.
Trouble lights are on; unit has no cutting
output.
.
A complete Parts List is available at www.MillerWelds.com
Clean or replace worn consumables as necessary (see Section 7-6).
Check for damaged torch or torch cable.
Place Power switch in On position.
Place line disconnect device in On position (see Section 5-8).
Check line fuse(s) and replace if needed or reset circuit breakers (see Section 5-8).
Be sure work clamp is connected.
Clean or replace worn consumables as necessary (see Section 7-6).
Have Factory Authorized Service Agent check for proper torch connections. Check operation of gas
valve AS1, and check gas/air system for leaks. Check filter element (see Section 7-5).
Check for sufficient gas/air supply pressure (see Section 5-2).
Check for dirty air filter and replace, if necessary (see Section 7-5).
Check air lines for leaks.
Have Factory Authorized Service Agent check pressure switch and control board.
Check torch shield cup (see Section 7-4). Reset power switch.
Have Factory Authorized Service Agent check torch.
Unit 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. If problem continues, have qualified technician check input line power.
Unit lost pressure (momentarily) while cutting. Check air line for leaks.
Unit lost output while attempting to cut or pilot. Check consumables and torch for wear.
Check and clean drag shield of any slag, particles, and debris.
Check input air pressure.
Torch travel speed too slow; increase travel speed (see Section 6-5). Clean or replace torch consumables
as necessary (see Section7-6). Be sure work clamp is securely attached to workpiece.
Be sure work clamp is securely attached to workpiece. Make sure tip is on or near [1/16 in. (1.6 mm) to
1/8 in. (3.2 mm)] workpiece (see Section 6-4). Clean or replace torch consumables as necessary (see
Section 7-6).
Torch travel speed too fast; reduce travel speed (see Section 6-4). Clean or replace torch consumables
as necessary (see Section 7-6). Be sure work clamp is securely attached to workpiece. Unit not capable
of cutting metals thicker than rating (see Section 6-2).
Check torch consumables. Check for gas/air flow at torch. Check air supply connection and pressure to
unit and torch. Reset unit Power switch. Have Factory Authorized Service Agent check torch and
connections inside unit.
Remedy
Remedy
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