Panasonic EW-DL75 Operating Instructions Manual page 16

Problem
The toothbrush does not operate.
The toothbrush stops operating
every once in a while.
The vibration increases
gradually when pressing the
power switch.
The toothbrush shaft moves.
If the problems still cannot be solved, contact the store where you purchased the unit or a service centre authorized by Panasonic for repair.
16
Possible cause
The rechargeable battery has reached
its operating life. (Approx. 3 years)
The appliance is used with
approximately 5 °C or lower.
The "30-second brushing notification timer
function" is in operation. (See page 11.)
The "Soft start function" is in operation.
(See page 11.)
Action
Replace the battery. (See page 17.)
Contact the store where purchased.
Do not use the appliance with approximately 5 °C
or lower.
This is not a malfunction.
Continue using it.
This is not a malfunction.
Continue using it.
This is the normal condition. (See page 11.)