Sounds like main transformer is bad or bad connection. Unplug it and take it apart and check for loose connections. Good luck.
SOURCE: Intermittent heat on weller d550 although lights
Heat gun tips often get bad electrical connection where the nuts tighten to the tip ends. Remove the tip, clean the ends, re-install the tip, making sure the nuts TIGHTEN onto the tip ends. Your problem is common and always caused by a poor connection at the tip ends/nuts.
SOURCE: lights don't go no weller d550
I cannot see by the picture if you have one or two light bulb model, but if you have the 2 bulb, then you must know that these bulbs are in series so they both must be good and they have to be 1,5 volt bulbs each or you will get a very dull light. If it is a single bulb, then you need to check the screw-in socket and check the bulb with an ohm meter or continuity tester. iF ALL TESTS OK, THEN THE PROBLEM IS INTERNAL AND YOU WILL HAVE TO OPEN THE GUN OR JUST FORGET IT. GOODLUCK, MACGIVOR.
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