I've had this old Honeywell thermostat for quite possibly 20 years. It's a 7 day programmable thermostat with a battery backup (2 AAs). A couple months ago I had someone come out to look at my AC. He was not my normal guy, because I have a home warranty and thought it would be a good idea to use them. Ever since his visit, the batteries only last about a week. Before his visit, I couldn't tell you how long they lasted. The thermostat has 4 wires, Green connected to the G screw, Yellow connected to the Y, White connected to the W and Red connected to the R (there's a jumper connecting that to the RC. FYI, the thermostat model is Honeywell rth7400/7500. All the wires seem secure at both ends. I just had my regular guy come out and do a fall check on the heater and he says everything is fine, that it has to be the thermostat needs to be replaced. It is old but seems like it's way too much of a coincidence that this started when the home warranty guys were poking around. Do you guys concur with him that the thermostat just started eating through batteries like there's no tomorrow? Or is it more likely that something in the HVAC unit isn't connected and supplying power to the thermostat, making it use batteries instead of A/C power? Also, is it possible if the thermostat is set to either heat or AC, it provides power but if the thermostat is set to off, it just uses the batteries (we've had more nice days this summer than any other I think and haven't needed it on)?
source https://hvac-talk.com/vbb/threads/2242765-Thermostate-backup-batteries-continuously-die?goto=newpost
No comments:
Post a Comment