OM-206 Page 20

5-3. Troubleshooting

Trouble Remedy

No weld output; unit completely inop-
erative. Be sure Power switch is On (see Section 4-6).
Secure power cord plug in receptacle (152 model) (see Section 3-7).
Be sure line disconnect switch is On (see Section 3-9).
Check line fuse(s) and replace if necessary. Reset circuit breakers (see Sections 3-7 or 3-9).
Check for proper input power connections (see Sections 3-7 or 3-9).
No weld output; fan motor FM running
and pilot light on. Check position of Output (Contactor) switch (see Section 4-2).
Thermostats TP1 and/or TP2 open (overheating). Allow fan to run; thermostat(s) closes when unit
has cooled (see Section 2-3).
Low weld output with no control. Check position of Amperage Control switch (see Section 4-3).
Have Factory Authorized Service Station/Service Distributor check control board PC1.
Limited output and low open-circuit
voltage. Check incoming power for correct voltage. Replace line fuse if open or reset circuit breaker (see Sec-
tions 3-7 or 3-9).
Check for proper input and output connections (see Sections 3-2, 3-4, and 3-7 or 3-9).
Erratic or improper weld output. Tighten all welding cable connections (see Sections 3-2 and 3-4).
Check for proper size and type of cable (see Section 3-2).
Check for proper input and output connections (see Sections 3-2, 3-4, and 3-7 or 3-9).
Replace electrode (see Section 7).
Arc not forming when using Lift-Arc. Check electrode and workpiece, clean as needed to allow good contact.
Fan motor FM does not run. Check and clear blocked fan blade; be sure blade is secure on shaft.
Have Factory Authorized Service Station/Service Distributor check fan motor FM.
W andering arc; poor control of arc di-
rection. Reduce gas flow rate.
Select proper size tungsten (see Section 7-1).
Properly prepare tungsten (see Sections 7-2 and 7-3).
Tungsten electrode oxidizing and not
remaining bright after conclusion of
weld.
Shield weld zone from drafts.
Increase postflow time.
Check and tighten all gas fittings.
W ater in torch. Refer to torch Owner’s Manual for part(s) requiring replacement, and repair torch as
necessary.