LG LFX25973ST - Door Ice Maker Not Making Ice

LG LFX25973ST (dual ice maker) - 3 years old.

The door/fridge ice maker has stopped cycling. I found it had stopped with ice frozen in the tray so I took it out and dumped the ice in hopes it would trigger a fill - it did not. The only difference from when it was working, was I activated the quick ice feature.

Things I have done so far:

  • Dumped Ice
  • Held the reset button numerous times from 3-30 seconds. This did not cycle the ice maker.
  • Unplugged fridge for 5 minutes.
  • Left the ice maker switch off over night.
  • Took ice maker assembly out and heated the fill tube with a hair dryer thinking it was a frozen up fill tube.

Tonight I am going to check the fill valves for resistance but is there anything else I can check? Freezer ice maker and water dispenser work fine.