Some of these smaller units have a fan and some don't: Obviously fans can crap out. Replace if they show any signs of degradation. In terms of failure, the sockets for the welding leads often degrade over time-the plastic starts getting brittle and they break, often with spectacularly bad results. Check the backplate or the internet (that's gunna be a tough search!) to seek word on actual duty cycle numbers. Don't push it as this is not an industrial welder and the insulation in the transformer might start breaking down with heat. That means you are likely around 10% at the top of the range: One minute welding, 10 minutes off to cool down. That means it aint 100% anywhere except so low in amps that you can't actually weld anything. Instead of a true duty cycle, it seems to just say "welding time up to 100%". In this case it might be that the high tap has a large diode to give you DC output (that's the way my old Cannox works and the red-colored socket implies this.) Sometimes those diodes fry and they are not cheap to replace-although they can show up on the surplus market for a song and a dance. High and low taps are usually just 2 transformer taps so that the adjuster can better meet the amperage range involved. They don't have some of the fancy gadgets and settings of a better welder but can produce a perfectly good repair-grade weld.
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