LawnMaster
Real-Time Clock / Backup Power Issue
Robot mower's clock or schedule resets frequently, causing missed or random mowing times.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Weak RTC backup battery on main board, Firmware bug, Power interruptions, Faulty main control board RTC circuit
How to Fix / Troubleshooting
Safety first: Turn OFF the mower and disconnect the battery before opening the housing.
- Check main battery: Ensure the main LawnMaster battery pack is healthy and maintains charge; deep discharges can affect RTC.
- Inspect RTC battery (if present): Some boards have a small coin cell. Replace it with the same type if voltage is low.
- Update firmware: Install the latest LawnMaster firmware to correct any known RTC issues.
- Reprogram schedule: After any changes, set the correct time and schedule again.
If the clock continues to reset, the RTC circuit on the main control board may be defective and the board will need replacement.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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