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synergy 5500 charging problem?

my phone does not charge and the display on the base station flashes the letter A or C. how do i fix it?
LEN ENGLISH, August 2017
Only info I could find was the manual:

http://bt.custhelp.com/ci/fattach/get/377070/1214918249/redirect/1/filename/BT_Synergy_5500_userguide.pdf

Acp, August 2017