Honda HRM300 Manual page 274

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Grass cannot be mown continuously.
The error message is displayed (page 3-15).
Not displayed
HRM300/500 is working continuously.
Stop immediately
Check the condition of charge (page 3-15).
Normal
Check the stop switch function (page 5-4).
Normal
Check whether a foreign substance bites to the
blade disk/rotary blade.
Normal
Check the blade motor (page 9-3).
Normal
Check the lift sensor and obstruction sensor in
the test mode (page 3-37, 3-39).
Normal
Check the sub wire harness for open or short
circuit and for proper connection.
Normal
Main ECU trouble.
Replace the main ECU (page 10-7).
If the error message is still displayed after
replacing the main ECU, replace the display.
(page 10-3).
Displayed
Check the error message and perform the
troubleshooting for fault/warning message
(page 6-8, 6-9, 6-10).
Continuously
but jerky work
Mowing load is high and load regulation is
working.
Decrease the cutting height.
Abnormal
Recharge the battery.
Abnormal
Check whether the manual stop button
operates correctly after installing the top cover
(page 7-4).
Check the stop switch (page 7-6).
Abnormal
Remove the foreign substance of the blade.
Abnormal
Replace the blade motor (page 9-2).
Abnormal
Lift sensor and/or obstruction sensor trouble.
Replace the lift sensor and/or obstruction
sensor.
·Lift sensor (page 10-5)
·Obstruction sensor (page 10-3)
Abnormal
Replace the sub wire harness.
TROUBLESHOOTING
6-7