E12
Yard Force
Main PCB Overcurrent / Internal Electronics Fault
Robot mower displays E12 and stops; often associated with sudden shutdowns or restarts.
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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
Short circuit in motor wiring, Damaged main PCB power stage, Moisture or corrosion on PCB, Incorrect fuse rating or blown internal fuse
How to Fix / Troubleshooting
Safety first: Disconnect the battery and remove the mower from the charging station. Wait several minutes before opening the housing.
Diagnostic steps:
- 1. Visual inspection: Open the mower and inspect the main PCB for burn marks, corrosion, or swollen components. If present, the board must be replaced.
- 2. Check motor harnesses: Inspect blade motor and drive motor cables for chafing or pinched insulation that could cause shorts to chassis.
- 3. Disconnect loads: With battery disconnected, unplug blade motor and drive motors from the PCB. Reconnect battery and power ON. If E12 disappears, reconnect motors one by one to identify the faulty circuit.
- 4. Replace faulty component: Replace the shorted motor or harness. If E12 persists even with all loads disconnected, the main PCB is defective.
- 5. Replace main PCB: Install a new Yard Force main control board, transferring any model‑specific jumpers or settings as per service documentation.
This repair involves high‑current circuits; if unsure, seek professional service.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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