Thermostat argh! help!

Old 01-07-15, 11:21 AM
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Thermostat argh! help!

I decided to replace my defective trane thermostat with a WiFi Honeywell. Got it hooked up last night. Powered up and activated the fan just fine. But nothing happened when I activated heat or cool. Since the color codes didn't match easily, I tried some other suggestions and configurations for the wiring of the thermostat. The last one I tried cut power to the thermostat and the unit. I checked the breakers and the cutoff switch's inside, in the attic, and outside. I flipped them all off and back on but still no power. Are there fuses? If so I haven't been able to locate them. I need to get this going soon as its supposed to be cold tonight.
Old 01-07-15, 01:05 PM
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Yes... there could be a plastic 3A or 5A fuse on the control board inside the air handler.

For us to help you.... we need to know what thermostat you had originally and how it was wired.
We also need to know what new thermostat you are installing.
Heatpump with backup electric heat ?
Old 01-07-15, 06:48 PM
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Trane's B terminal is C on almost every modern thermostat.

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