It appears that a few people have had issues with the operation of the Hakko style soldering stations, particularly the digital ones. Here's how to apply a fix that should solve a lot of the problems.
https://www.youtube.com/watch?v=S8BGkEnHetI
Big Clive
2017-05-30 22:38:41 +0000 UTCPhil Collins
2017-05-30 12:44:56 +0000 UTCAndrew
2017-05-29 21:22:37 +0000 UTCJoelle Seguin
2017-05-29 15:12:43 +0000 UTCJohn Ridley
2017-05-29 12:09:34 +0000 UTCJohn Ridley
2017-05-29 11:56:28 +0000 UTCLostngone
2017-05-29 06:39:57 +0000 UTCSprite_tm
2017-05-29 06:12:50 +0000 UTC