Make sure the cable from the shifter is connected to the junction box.

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Technique will always last longer then energy production. Improve biomechanics, improve performance.
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I will double check. I assume it is as the front derailleur shifts to the small ring.

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Aaron Bales
Lansing Triathlon Team

Quick and dirty though is that the servo motor is failing. Going from a larger cog to a smaller cog is easier. So, if it is struggling going the harder direction, then my hunch is the motor is failing or the the bearings servo gearing are binding.

The other possibility is that the RD went into crash mode. To reset it, push and hold the Junction A button for five seconds or more until you get a blinking red light on the junction box.

Edit: When it resets, it will run the RD through all the gears. So, be ready to spin the pedals to enable it to shift. (Or, remove the rear wheel before doing the crash mode reset.)

Di2 going into crash mode is one possibility.

Slowtwitch FTW! Worked like a charm - many, many thanks!

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Aaron Bales
Lansing Triathlon Team