Master bedroom Honeywell thermostat is offline and can't get back online. All other thermostats are working fine
I have had some similar problems with my Nest thermostat. The directions just confused me so I Googled the make and model of our nest and a few words about our problem...found some great YouTube videos that explained it really clearly (just from normal people, not the company). I'd try that!
Call Honeywell customer service , they will walk you through it ! Their customer service is great !