My remote sensor Tx14TH-LCD-B started flashing
I assume you have tried removing the batteries at both ends, reinstalling batteries at the sensor end then the indoor end, waiting without touching anything until the outdoor temp registers and heaving a sigh of relief as things are back to normal. I also assume since the word atomic is in the header that you have an atomic clock function. If nothing works or doesn't work right you probably need to replace the system.
I have a much simpler LaCrosse system which, at this moment, is showing an outside temp of 56 degrees BUT the clock doesn't work and failed early on. I share your frustration.
on Nov 04, 2013