Re the light:
When the «cartridge» light starts flashing, the remaining fluid in the cartridge is sufficient for approximately 5 more cleaning cycles. After these 5 cycles, the cleaning performance will be reduced and the cartridge has to be replaced.
When the «cartridge» light illuminates constantly, the cleaning function is locked and a new cartridge has to be installed.
Only then, the next cleaning cycle can be started.
.
To find a replacement, Refer to
http://braun.com/ to find the website for your country.
Otherwise, refer to
http://braun.com/us/consumer-service.html which will help you locate a local Service Center.
Mode number for the cartridge is CCR2