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I just fixed it. I went and I exchanged it for a Honeywell RTH7500 series. It's been working fine for a couple of hours now. Hope it keeps working.

Thanks for your input.

1. there are only the 5 wires
2. I'd say it's pretty hard. I would rather not engage in fishing any other cables because I'm afraid the project may become too big for me.

I have done some...

I was afraid of that. Anyway, I have no problem taking it back, but since I'm asking questions anyway, what would be the right thermostat for my system? I want a programmable one.

Thanks for the...

Hello everyone,

I have a problem with figuring out the wiring from a Trane XL80 2-stage furnace/ac unit to a Hunter Programmable Thermostat model 44155C. The existing thermostat is an old mercury...