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Hi and welcome to JustAnswer, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially , re-confirm and post back with the complete model number of the phone system.
Still and to address the "...got some water inside...", consider rice and/or Silica Gel.
Perhaps the videos HERE and HERE may shed insight (though for another device).
Try unplugging the base unit for an extended period of time.