u/DomOnDeck

Well, after more than 3 weeks of waiting on customer service, Lymow has finally agreed that my unit is defective. No matter what I tried, the mower’s location service would essentially crash. There was no rhyme or reason for when it would do it. Sometimes it could mow part of a zone. Sometimes it couldn’t even leave its dock. I suspect something very strange happened when mapping a zone. A firmware glitch. A corrupted module. Something that could not be remedied with resets, power offs, or updates.

When the mower would lose its location service, it would just stop completely because it didn’t know where it was in relation to the RTK base station. After that, nothing would work. I can’t even manually drive it in that state.

Thankfully, support has agreed to replace the unit. I am just waiting on a return label (who knows how long that will take).

This seems like a very rare, isolated problem. So I am hopeful that the replacement unit won’t fall into the same cycle. I’ve only seen one other Redditor with this problem.

Long story short for anyone reading this in the future, if your mower glitches out with E15, E16, and E21 errors, something is causing location services to crash. And there is nothing you can do to fix it. Replacement is the only option.

I got my mower 2 weeks ago. It mowed great on day one. The next day, it was unusable.

For the next 2 weeks, I tried everything (given the lack of support). Power cycles. Base station positioning. RTK positioning. Power supply checks. Resets. Rebinding. Delete and add mower. Remap everything. Backup map.

You name it, I tried it. E15, E16, E21 errors. Weak RTK. Location service init failed. Mower stuck. All of this despite perfect RTK accuracy of less than 1 centimeter.

Today, in a last ditch effort, I deleted everything and decided to start from scratch to see if I could find any connection to what was causing the mower to glitch out.

After starting fresh, I could finally control the mower through Bluetooth.

I completed a mowing zone mapping. No issues. Went up to the base of a tree in the zone to map a no go zone. Finished no go zone. Immediately after completing the no go zone, the mower glitched out. Same symptoms. E16 error. Location service failed.

Go into app, delete the no go zone. I can regain control of the mower immediately.

I tested this in various zones with various no go zones. The size, shape, and proximity to the perimeter of the no go zone didn’t make a difference. It was almost as if the mowers location service completely locked up after finishing the mapping of a no go zone, despite high RTK accuracy.

For now, I will turn on smart obstacle detection to deal with some of the trees in the zones.

But I would really like to be able to use the no go zones. I need them for some mulch beds, septic tank, large trees, wood piles, etc.

I know the no go zones in the app can be glitchy. But has anyone else experienced this? Besides reporting to Lymow’s team and submitting a lot in the app, is there anything else I should try.

I knew from the beginning it was a firmware glitch causing the issues I was having. I just couldn’t put my finger on it.

If anyone else is having E15, E16, or E20 errors, back up your map, delete all your no go zones, and try to mow again.

I am shocked that no go zones are what was causing this bizarre locking up/braking/unable to control manually/error behavior.

Fingers crossed that a future firmware update can fix it.