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This is a new very basic Honeywell thermostat. First let me say that I changed out my fan-limit control a couple of days ago because it was short cycling. It still may be with the new one, but not as bad. So, I changed the thermostat hoping that was the problem. The new one is exactly like the...

I have an ancient Lennox furnace. Model G12Q3-137-2. It needs a new fan / limit control unit. The current one is a Honeywell with an 8" insert. Model L4064A 214 5 I've not done this before, but it was very easy taking the unit out. Just four wires and two screws. My problem is that I can't...