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The Fold X has 280 miles when this power cut off started.  Thinking it may be thermal sensor shut off to prevent damage to the battery and motor, I fully charged the battery and rode the bike only in power assist levels 2 and 3 without touching the throttle switch.

The bike ran great until the battery dropped from 5 bars to 4 bars.  Within 2 to 3 minutes of the dropping down to 4 bars, the LCD screen shut down and no power output from the motor.

After few minutes of waiting, I powered up the LCD screen and the battery indicator shown 5 bars.  The bike again worked great in PAL 2 and 3 and again without me pressing down on the throttle.  After riding the bike for 1 to 2 minutes, the battery indicator dropped from 5 bars to 4 bars.  Shortly after, the LCD screen shut down and no power from the motor.   Now, the LCD screen refused to turn on.

This happened on two consecutive day and both times the LCD screen shut down and no power from the motor ONLY when the battery went from 5 bars to 4 bars.

UPDATE: I left the bike alone for an hour and without charging the battery.  I was able to power up the LCD  display.  Again, battery indicator shown 5 bars.  After a minute of riding it shown 4 bars and then shortly after everything shut down.




 

Edited by EmtbRider
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Are you basing your Thermal Shut Down Theory on the fact that the motor, battery or controller are hot to the touch of your hand?  Since neither the Bafang Hub Motor, the Battery nor the Controller have a thermal protection circuit, heat related shut down probably would be rare.
Try installing the LCD cable Shunt, the connector cap the came on the controller cable, when your fold was delivered and you removed to install the LCD. If your Fold now performs without shutting down, the problem is the LCD. If it still shuts down, contact Sondors.com and Submit a Request to initiate a Trouble Ticket for a LCD or Controller Replacement.  
  FA7A23E0-74C1-4EF0-8B8C-C24323DEFC9C.jpeg.2346c8a9b61b7fbf10ea6fde6a79d74c.jpeg

REDDY

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I’m learning about this bike.  As such, what is the purpose of disconnect the controller cable and to plug in the  LCD shunt?

Btw, the battery and motor hub were barely warm to the touch.

 Thanks for replying.

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If the Bike Operates Correctly & doesn't shut down,  without the LCD connected (of course without the advantages of the LCD’s Display Features or the PAS settings) that indicates a LCD is malfunction. I’m betting the shutdowns will continue because Controller Malfunctions and the Shutdown Anomaly is much more prevalent in controller problems than LCD failures.   
The electrical architect of all hub motor Sondors are basically the same and the Original Sondors Fat bikes were delivered and operated by owners without an LCD.   
F15BF769-FA64-43B6-81C9-18B3AD910CC7.jpeg.ec9298ae1f3166d07fe618901feadeab.jpeg

           REDDY

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Sondors.com doesn’t advertise adequately that the assemble instructions are on the Sondors Web Site that advises you save the shunt for just such instances, especially when the LCD’s are damaged in a fall or other accident. 
You can buy a replacement cap at Boltonebikes.com. I keep mine with my Sondors, tapped inside the battery box.

https://boltonebikes.com/collections/electrical-accessories/products/replacement-lcd-cap

28C2D9CE-B578-4127-BAC2-8C3252C2F97E.jpeg.87bfeff53ceffea891c43669e97ae427.jpeg

   REDDY

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Sondors is sending a shunt so I don’t have to purchase one.

Another question - I borrowed a battery from another Fold X.  Fully charged it provided power for at least 15 miles (with pedal assist and throttle only).  However, when the battery dropped to 4 bars,  on the borrowed battery, the LCD shut down and no power from the motor.  Why it happened only when the battery dropped to 4 bars? 

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That’s what this trouble shooting procedure is suppose to reveal. I suspect a bad controller, the most failure prone component with Sondors’ failures.  Why?  Please review every technology article on this site: https://www.electricbike.com/category/technical/
We Shall See. 
Have you changed any of the LCD settings? If so, I recommend resetting the LCD / Controller, to the factory configuration. 
‘The fact that, regardless of battery used, 4 bars on your display, will cause a power shut down could be either a Controller Configuration Problem or a Controller malfunction. Resetting the controller could correct your problem but we need to determine if the LCD itself is the problem by trying to eliminate it first, or confirm it is the culprit. It’s a process of elimination.
F15BF769-FA64-43B6-81C9-18B3AD910CC7.jpeg.ec9298ae1f3166d07fe618901feadeab.jpeg

          REDDY
 


 

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  • 2 weeks later...
Posted (edited)

After few tests  I think the LCD display is bad.  The display was left at stock settings from purchase. 

The bike ran fine with the shunt plugged into cable that goes to the display.  However, when the shunt was removed and the cable was plugged back into the display the bike again lost power after few miles.

Another thing that was discovered was the battery indicator bars.  The bike was drained down to 3 bars (using the shunt to run the bike).  When the bike shut down and was powered back on few hours later it shown full battery (5 bars) yet the battery was never charged.

New lcd is $150.  Are there aftermarket LCDs that are “plug n play” instead of having to also change the controller and throttle?

 

Edited by EmtbRider
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Contact Sondors.com and start a Warranty Replacement Request.  Let them know the anomalies and test procedures you’ve accomplished to conclude it’s the LCD. 
Because of Sondors’ Proprietary Component Communication Protocols, the only way to check about aftermarket compatibility to individual Sondors Models, it’s imperative to verify those Generic replacement components with suppliers.
‘Electrobikeworld.com   has the best track record for supporting Sondors’ Owners. 
F041D007-0236-48C6-9F4A-4C6484D1B7C2.jpeg.00e012adf5e04768a1ab0db40e872129.jpeg

                  REDDY

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