Hobart Welding Products 300 DC, 300 AC manual Troubleshooting, Trouble Remedy

4-3. Troubleshooting

	Trouble		Remedy
No weld output; unit completely		Place line disconnect switch in On position (see Section 2-10).
inoperative.
		Check and replace line fuse(s), if necessary (see Section 2-10).
		Check for proper input power connections (see Section 2-10).
		Check for proper jumper link position (see Section 2-10).
No weld output; fan on.		If using remote control, place Output (Contactor) switch in Remote 14 position, and make sure remote
		control is connected to Remote 14 receptacle. If remote is not being used, place Output (Contactor)
		switch in On position.
		Check, repair, or replace remote control.
		Unit overheated. Allow unit to cool with fan On (see Section 2-3).
		Have Factory Authorized Service Agent check control board PC1.
Unit provides only maximum or		Have Factory Authorized Service Agent check control board PC1 and hall device HD1.
minimum weld output.
Weld output always above or always		Have Factory Authorized Service Agent check control board PC1 and hall device HD1.
below set value.
Erratic or improper weld output.		Use proper size and type of weld cable (see Section 2-6).
		Clean and tighten all weld connections.
		Check position of Output Selector switch (see Section Figure 3-1).
		Have Factory Authorized Service Agent check control board PC1 and hall device HD1.
Fan not working.		Check for anything blocking fan.
		Have Factory Authorized Service Agent check fan motor.
No control of weld output.		If using remote control, place Amperage/Voltage control switch in Remote 14 position, and make sure
		remote control is connected to Remote 14 receptacle. If remote is not being used, place switch in
		Panel position.
		Have Factory Authorized Service Agent check control board PC1.
No 115 volts ac output from duplex		Reset circuit breaker CB1 (see Section 4-2).
receptacle or Remote 14 receptacle.
No 24 volts ac output at Remote 14 re-		Reset circuit breaker CB2 (see Section 4-2).
ceptacle
Wandering arc – poor control of		Reduce gas flow rate.
direction of arc.
		Select proper size tungsten.
		Properly prepare tungsten.
Tungsten electrode oxidizing and not		Shield weld zone from drafts.
remaining bright after conclusion of
weld.
		Increase postflow time.
		Check and tighten all gas fittings.
		Properly prepare tungsten.
		Check for water in torch, and repair torch if necessary. See torch Owner’s Manual.
			OM-318 Page 17