Are pedal assist sensors sensitive to cold?

[RoostChucker]

All temps are represented in Fahrenheit...

I store my bike (750 watt hub motor, 20AH 48V Battery) in a heated garage. I keep the thermostat set to 60 degrees. This morning when I left the house for the 8 mile trip to my office it was about 20 degree outside. I cruise at about 23 mph or so the maximum windchill calculates to about 3 degrees.

At about mile 4 my bike stopped providing power despite still having a full charge indicated on the display. I don't think this is a voltage problem due to the cold. I power cycled the bike and voila, I'm moving again under power. Then it happened twice more. It was at this point that I noticed that although the throttle worked fine, the pedal assist wasn't kicking in. I cycled the power on the bike twice more and still no pedal assist.

I stayed on the throttle the rest of the way to my office and it seemed to like that. Once I arrived I brought the bike inside.

I let it sit for a couple of hours to warm up and then tested the pedal assist... It worked as if nothing happened. This could also have nothing to do with the temperature and may simply be a coincidence. Maybe its just a bad sensor???

Questions:

1. Is there a safety feature that will suspend power delivery at the throttle if it doesn't detect the occasional pedal rotation? Possibly a safety timeout? That sounds like it could be a thing to me.
   
   
2. Has anybody ever experienced this lack of pedal assist (despite a working throttle) in the cold before?

 

[Annieolnie]

Have you checked the magnets on your sensor to see if they are dirty or gunked up? If there is anything in there and it develops frost or condensation it could stop it from functioning. I once had a smoke alarm that would randomly go off. It turned out to be a spider that insisted on trailing a web over it at every opportunity. A warm garage could could create the same sort of situation and spider webs love dew and frost.