I have two T8601D2019 thermostats in my home that were installed new when the house was built in 2002. Recently I noticed the upstairs unit was displaying a temperature four degrees below what our program was set at. Our setting is "heat" with fan at "auto". With some fiddling around with the...

Gas furnace is about 32 years old. This summer I noticed that switching the Fan to run in manual mode, 90% of the time it will not turn on. Suspecting the thermostat, I installed a new 7-day programmable type. 1st time I tried manual fan it worked OK. Most of the time fan will not turn on using the...

Have a carrier outdoor package unit A/C and electric heat. Recently changed from the carrier programmable to a standard heat/cool stat. original stat had a light that would indicate when the filter needed changed, assume this was the blue wire that we did not connect when installing the new...

This is a 15 old unit I checked it yesterday and everything seems to work all right on manual mode but when turned on auto it fallows all steps but when it sends signal for fan to go on it does not work

Hi, I have a Concord Gas Furnace with Carrier Central A/C. Today I found out that the blower is not starting whenever A/C kicks in. It doesn't auto start for heat either. Tried setting Fan in Always ON mode and still doesn't start. However if I turn off Heat/Cool and leave the Fan in Always ON...