Got my XYTronic last week to replace an older iron and used it yesterday for the first time. Worked great. Then I tried to work on my project some more today and the iron won't get hot enough to melt solder. Nothing changed from yesterday. I double checked that the temp knob was turned all the way up. It gets hot enough to sizzle the cleaning sponge but not hot enough to melt 0.02 diameter 60/40 rosen core solder when I touch it against the tip.
Any ideas on what could be wrong? Is there any internal fuse? Anything that might screw up the temp regulating mechanism?