Lithium Ion Diagnostics How to 

    For the most up to date information on SBD/MTD product service procedures and bulletins we recommend MTDTech.com.

In the image above you can see the Service support site underlined. This is the magic link for all service related info.

 As a lithium ion unit the fastest and easiest way to diagnose them is using the tool. Once you access the MTD Tech Service and Support site search for  “Lithium”.

Click on the first result. Scroll down to the text:

 CLICK HERE FOR: 56 VOLT LI-ION TROUBLESHOOTING

Click on this link above to go right there.

You should get a screen like this.

Follow the guide for no power and within a couple of tests you will know where to go next.