Question about Honeywell Heating & Cooling
I had that last night. I turned off the unit for a couple of hours and it came back on and ran and cooled. I have no friggin' idea if it will work but it got us through last night.
Posted on Jun 24, 2008
I have had the same problem- twice. It was a similar but different problem each time. The -AC means the ac control voltage isnt making it to the thermostat. In my case both times it was a switch in the control circuit that wasn't closing properly. The easiest was the front cover switch. If the front cover is removed from the furnace or has vibrated loose, the switch will open, preventing the furnace from running. The other instance I ran into was a flow switch on the exhaust blower which ensures the there is flow OUT the chimney. The switch wasn't functioning, so the furnace wouldn't start. The blower would come on for a short time, but the burners wouldn't light.
Hope this helps,
Posted on Dec 12, 2008
Tips for a great answer:
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Yes, you can replace with that...just make sure that you mark the wires BEFORE removing them...so you can place them on the same terminals on the new t-stat...
Here is a list of each common terminal and what their commonly used for. Also listed is what colors are commonly used. NEVER ASSUME these are what you have. Verify all your wires by following each to each piece of equipment. This will help you to be able to match your equipment with the terminal.
Here is the rest of the tip that I wrote...
Thermostat Wiring and Terminal Designations
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