Question about Honeywell FF12HH Thermostat

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Trying to install a Honeywell RTH6400 but I only have a white and a black wire coming out of the wall.

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Hi,
Hook the black wire to the "R" terminal and the white wire to the "W" terminal...
That's all you have to do... then program the t-stat...

heatman101

Posted on Oct 14, 2010

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I have the same problem. I am Trying to install a Honeywell RTH6400 but I only have a white and a black wire coming out of the wall. Do I have the wrong thermostat. The manual doesn't explain this siutation.

Thanks!

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