You have to specifically enable lift detection in working preferences. The mower modules lift sensors are the two caster wheels. If either one of the drop down it breaks a circuit. Not sure if normally open or normally closed. Either way if you flip the mower over you can move them up and down and get a feel for how the sensor works.
As for the clearance level, the default is low and is fine for most people. Anything else is meant to help with clogging and thicker grasses. But if you remove the blade guards and brackets, most of the time those issues go away.
I suspect this may just be a software bug. Hoping it’s not hardware.
Thanks for the help, I am working with Yarbo through the ticket process, and they asked for time and date of issue, so I sent them a screenshot, which I am getting used to taking whenever Yarbo seems to stray from the normal.
I do have Lift Detection and Rollover Protection turned off.
I was able to do some more testing after Yarbo started freezing again with the fault “Please wait until …”. I can lift the left side about 3 inches and the blades start and the mower begins to move. When lifting the right side after Yarbo is frozen, nothing happens.
I have cleaned the mower deck, reseated the mower physical connection and reconnected the electrical connection. Also of course the full battery reset as well.
Tim
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Wondering if this might be an electrical short or something. Just odd that it’s happening to quite a few and even the 23 models. This really leads me to believe it’s a firmware bug.
I’ll report back when support finds a solution…
Tim
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I also used the same temporary workaround to lift the module slightly and it would restart the mower, until the next slight hill makes it stop again.
Yarbo replaced the module under warranty. The replacement has been working flawlessly the past week, the defective mower is being shipped back this week.
I am sure that Yarbo will take it apart and figure out what the problem is, but my feeling is that they have an electrical connection whose wire is slightly too short for the potential range of motion of the mower, and in extreme stretching the plug becomes slightly loose.
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That’s possible but they do try and get the user back up and working quickly and if that means shipping hardware to do so, sometimes that is what they’ll do to until they can determine if it’s actually a software issue. Sometimes the remote diagnosis can appear like hardware but once they get the unit back and dissect it, they determine it’s something else entirely. At least that was my experience.
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Yeah the fact that I can flex the mower module makes me think it’s hardware. I can slightly lift one side and the blades start up gives me that feeling.
I’m still in limbo…I think they might be checking logs.
Frederic, how did you send the video. I’ve got one of me “fixing” the problem I’d like to send in.
Tim
To send the video I had to give them a link to my Google Photos, the attachment size limit is way too low for videos.
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Thank you, I will try that.
Tim
Edit, May 29,
Yarbo support just confirmed after escalating the problem to engineering, that the problem is in the mower module, and a new unit will be shipped within a coupla weeks. I suspect as you do Frederic, that the problem is a hardware issue, not able to be reset or restored with new firmware. That module goes through a ton of vibration and gyration when working, so it’s got to have bulletproof wiring and connections to all three motors, lights, and sensors. That is a nontrivial task for sure. One thing Bryan has mentioned a lot is the need for exact time of malfunction so that Yarbo support can pull the core logs for that time. I second that, and think that those screenshots might have helped them find now a couple problems this unit has had.
Second edit, June 8, new mower module arrived yesterday and did a full day mowing today, problem is fixed and all is well in Yarbo-land!
Tim
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I experienced this problem. In troubleshooting, I found that there is a magnet on the Mower Module aligned to a sensor on the core. That magnet is fragile and broke. While there were still magnet pieces, the "Waiting for Blade Speed " error was showing, as this seems to be an emergency stop sensor.
Once the magnet is completely gone it throws the “Module loose” error. This error bricks the unit.
As a temporary solution I took the magnet from my snow blower.
Unfortunately I crushed that magnet when installing. Now I need Yarbo to send me replacements. They should also use a screw that won’t crush the magnet and use a more pliable magnet material that will not disintegrate from the vibrations.
Alternatively, you can attach the SAM to hobble back to the dock.
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Interesting on the relationship to blade speed and the module detection sensor. Haven’t heard that correlation yet. Support should be able to disable the sensor temporarily until they can get you a new unit or part. Firmware updates will revert the setting though.
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