.A complete Parts List is available at www.HobartWelders.com
6-6. Troubleshooting Power Source
Is input power connected to correct line voltage?
Yes
Is Power switch in the On position?
Yes
Is Power light on?
Yes
No
No
No
Connect unit to proper input 
voltage. (see Section
Place Power switch in the 
On position. (see Section
*
Check Power switch S1 
(see Section
Control board PC1.
Are Power and
Temp lights flashing?
No
Is compressor operating?
Yes
Does pilot arc ignite?
Yes
No
No
*
The compressor current lim- it was exceeded either above or below its operating
range (see Section
*
Momentarily press torch trigger and listen for com- pressor operation. Check for Postflow air at torch. Check Control board PC1, compressor filter, and com- pressor connections to PC1 and torch.
Press torch trigger and check if pilot arc ignites. Check torch consumables. *Check torch connections, Control board PC1, com- pressor, and torch.
Is Power light flashing?
No
Is Cup light flashing?
No
Is Temp light On?
Yes
Yes
Yes
*
Reset Power switch S1 and 
verify input line voltage during cutting (see Section
Check Control board PC1.
Check torch consumables (see Sections 6-2 and 6-3).
*
Unit overheated or ambient temperature is below −40° C (−40° F) (see Section
Yes
Does pilot arc
transfer to workpiece?
Yes
*
Check all connections.
No
Place torch near workpiece and check if pilot arc “jumps” or transfers to workpiece.
Check work clamp connec- tion. *Check Control board PC1 and connections, and torch and its connections.
No | *Servicing procedure to be performed |
| only by authorized Service Station. |
