Honda Real‑Time Clock / Memory Retention Issue

Robot mower occasionally loses time or schedule settings after being powered off.

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.

Possible Causes

Weak backup battery on PCB (if fitted), Firmware bug, Main PCB fault, Power removed before proper shutdown

Safety first: Turn OFF the mower and disconnect the battery before opening the electronics compartment.

Check shutdown procedure: Use the menu to power down the mower properly before using the main switch, if the manual specifies this.
Inspect PCB backup cell: Some boards have a small coin cell; if accessible and allowed by Honda, replace it with the same type and polarity.
Update firmware: Ask a Honda dealer if a firmware update is available to correct clock issues.

If settings continue to reset, the main PCB may need replacement.

Hard 4/5

Main Control PCB

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