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symptom
possible cause(s)
corrective action
Blade does not heat up
when weld button is pressed
Misaligned weld
Blade ends overlap
Incomplete weld
Weld breaks when used
Blade melts when welding
Brittle welds
1. No power to welder
2. Weld pressure adjustment not reset
3. Weld pressure adjustment set to 0
4. Blade or jaws dirty, rusty or oily
5. Loose connection to weld switch, limit
switch, transformer, or welder jaws
6. Burnt transformer
1. Dirt or scale on jaws or blades
2. Blade ends not cut square
3. Blade ends not correctly aligned when
clamped in jaws
4. Worn jaws
1. Improper weld pressure
2. Blade ends aligned incorrectly
1. Weld pressure adjusted incorrectly
2. Improper clamping
3. Defective limit switch
4. Movable jaw sticking
1. Weld not annealed correctly
2. Weld ground too thin
3. Incomplete weld
1. Weld pressure adjusted incorrectly
2. Inaccurate moveable jaw retraction
3. Movable jaw sticking
1. Weld not annealed correctly
2. Dirt, oil or flash on blade or jaws
1. Check power at receptacle and check that
power switch is ON.
2. Reset weld pressure adjustment knob; see
“Blade Welding”
3. Adjust weld pressure properly;
see “Blade Welding”
4. Clean blade and jaws
5. Check; tighten if necessary
6. Replace
1. Clean jaws and blades
2. Cut ends square
3. Clamp blades against
jaw alignment surface
4. Replace
1. Reduce weld pressure; see “Blade Welding”
2. Align blades properly
1. Increase weld pressure: see “Blade Welding”
2. See “Mounting Blade”
3. Replace
4. Clean and oil jaw dovetails on inside of cabinet
1. See “Blade Annealing”
2. Grind weld to thickness of blade
3. See Incomplete Weld section (above)
1. Increase weld pressure
2. Allow sufficient time for tool to cool down;
see “Blade Welding”
3. Clean and oil jaw dovetails on inside of cabinet
1. See “Blade Annealing”
2. Clean blade and jaws
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