Power supply/charger is not plugged properly into the main power supply.
Charging plug is not fully inserted into the charging socket of the mower.
The charging process has stopped due to a temporary power loss.
No power to receptacle or main power is shut off.
The mower contacts do not touch the Base Station contacts.
The mower or Base Station contacts are dirty.
Charging is not detected, although there is physical contact between the mower and the Base Station contacts (mower is found in the Base Station entrance).
Mower does not reach the Base Station within the time and distance limitations.