Old honeywell thermostat a/c fan won't turn off.
I have an old Honewell mercury thermostat with a a/c and heat back plate.
It's been there maybe 20 years. I can turn the fan off and it still runs where it's on hear or cold. The heat is hot water baseboard. Is there a reset button on these old thermostats?
I'm leaning towards a relay problem.
I have a trane model twg025a 140b1. It's about 12 years old. The thermostat wires go into the unit. I suppose when I remove the side panel I'll see what's inside. I had a similar problem with my gas boiler and the thermostat wouldn't turn on the circulator pump. Turned out to be a relay
on the side of my boiler. To bad the A/c isn't as easy to find.