Question about Honeywell Heat/Cool Thermostat

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My RTH6400 honeywell thermostat the heat comes on with seeting on cool

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You have the wires crossed in back of the thermostat. Check the back.It should be color coded like a telephone jack is.

Posted on Jul 26, 2009

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1 Answer

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


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

Oct 14, 2010 | Honeywell FF12HH Thermostat

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the burners light? if the burners dont light than it's working right the blower on the furnace comes on with the a\c

Jun 19, 2010 | Honeywell Electronic Programmable...

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New thermostat not cooling. Blowing heat instead.


Hello You have only 5 wires? multi stage if so ,is run by something else.Check that RH/RC is jumped out on new stat.Also check that O is not on the B terminal.If there is an A/B select switch set it to O.Emergency heat button dont matter as there is no wire to run it with only 5 wires.

Apr 17, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Where does the W2 wire go?


w2 wire is second stage heat does your furnace have two stages.look at gas valve it would have 2 valves/ sol w2 will go to w2 on stat. if a single stage furnace w2 is not used

Jan 25, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Wiring with Honeywell RTH6400


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!

Dec 29, 2009 | Honeywell FF12HH Thermostat

1 Answer

I am tying to install an RTH6400 5 in 1 thermostat but the colors of wires i have on my wall are RED, GREEN, BLUE AND BLACK, where as the book has RED , YELLOW,WHITE AND BLUE. please which do i connect to...


You need to open up the panel at your furnace(air handler) and find the terminal strip and see what your existing thermostat wires are connected to. Normally your red wire connects to the R terminal(24 volts), the yellow wire to the Y1 terminal(cooling), the white wire to the W1 terminal(heating), the green wire to the G terminal(indoor fan). You can use whatever color of wire you have existing, just make sure that the R,W1,Y1,and G wires at the furnace match the R,W1,Y1, and G terminal screws at the thermostat. Also make sure the power to the furnace(air handler) is turned off before you make any wiring connections at the thermostat or furnace.This is very important! If you don't and you short any wires to ground(especially the R wire) you will possibly ruin the system step down transformer or blow the low voltage fuse.

Nov 10, 2009 | Honeywell Electronic Programmable...

1 Answer

RTH6400 Honeywell - where does the blue wire go. There is also a yellow wire. How do I connect the red wire when there is a wire clip going in the place marked R & RC???


it all depends how things are wired inside your furnace downstairs on a basic system blue is usually a common - C and yellow is for cool - Y just leave the jumper in from R & RC R is 24v power and RC is 24v power in Cool yuo will just have to squeeze the new wire in with it before you get to far i would open up the doors on you furnace and see where the connections are in there so you dont blow any fuses

Jun 28, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

After RTH6400 installation heat strip is no longer actuated


http://yourhome.honeywell.com/Consumer/Cultures/en-US/Products/Thermostats/Do-It-Yourself/Programmable/5-1-1/Default.htm look at the very last part of thius page and you will see that the particular thermostat does not work for heat pumps tha have auxillary heat. Sorry for being the bearer of bad news but you need to upgrade the selection to make it work right.

Jan 24, 2009 | Honeywell Electronic Programmable...

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