It's 1:00 AM and I have a twisty-tie bypassing the thermostat. It's a White-Rodgers heat/cool programmable about 10 years old. I can hear the relay clicking but it doesn't always trigger the 2 year old Trane furnace. It's been acting up since I replaced the 3 AA batteries about a week ago. Yes, I did check the batteries and even put a second new set in. It seems like a coincidence but I assume nothing. Is this worth fixing? The cooling relay works.
I'll run the temp up to 72 or so, put the twisty-tie back on the bread loaf and go to bed. It should still be in the fifties when I get up. I have a cheap heat-only thermostat at work that I can use if this is worth fixing.