I suspect my furnace of reaching a temperature limit and cutting power to my thermostat as a result. How would I determine if that is the case?
First off, my situation is very similar to Furnace turns off power to the thermostat, but I have a slightly more basic question. It may be helpful to read that question first though.
I recently replaced my 4-wire thermostat with a 5-wire wifi thermostat. It now will regularly lose power. I've checked and replaced the wiring from the thermostat down to the furnace. I had been thinking a loose connection was the cause, but now I'm not so sure.
Like the other post, I have an older natural gas furnace that (based on comments from HVAC professionals) is likely getting less than ideal air-flow. How would I confirm that the furnace is actually hitting a limit and thus cutting power?
If it helps, the loss of power seems to be more common when it is colder outside and the furnace has to work harder. It's now bad enough that the furnace doesn't run enough to keep my house quite up to full temp on very cold days. The thermostat can take many minutes to reset and then doesn't keep the blower running for a time after the heat is off.