Columbia FRS-S14 two way radios

Question

I have a pair of two way radios made by Columbia Telecommunications Group. Models FRS-S14. one is serial number A09 11242 the second is A09 11263. I got these off a friend a year ago. No manual. The units will not communicate with each other. All funtions seem to work and the transmit symbol comes on when you transmit, but the opposite unit does not pick it up. I tested them with my scanner and both transmit, but on different frequencies. Any advice? Thank you