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Instaling a wall thermosstat RTH11/RTH221, the old thermosstat has a yellow wire and a red wire from the wall, Ware do i conect the red wire? on the G-termanal the Rh termanal or W Termanal? Also how do i turn on to test if it is working.

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  • blentyn Apr 24, 2009

    I have an RTH22 also and I have 4 wires. Blue, Red, White, and Green. The heat works fine but the AC won't come on. I have the red connected to Rh, the white to white, and green to green. Do I use the blue one?

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RED TO RED YELLOW TO WHITE

If you have a OHM meter, you can test it first to find out which one is neutral wire ( same as white wire position) before you connect the wire, usually red wire or black wire are hot wire.

Posted on Jul 06, 2008

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All is standard, heater is gas, AC is electric, old thermostat was old and burned. I have TH3110D1008 and 4 wires.


the colors on standard t-stat are rh/rc gets red wire. g goes to fan green. y goes to outside unit cool. and in your case w labeled black goes to heat normally this wire is white.

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Error code "ch12 for LG PQRCUSA0


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I have a Trane XE1000 High Effeciency heat pump, installed in 1989, in the house I am renting. I'm having issues with the air and I think I hooked the thermostat up wrong. I have 8 wires coming out of...


The white wire goes to W2, the green wire goes to G, the red wire goes to R, the orange wire goes to W or O, and the Yellow goes to y. If this is a digital thermostat you will have to go to the set up mode to set the system up for a heat pump or the reversing valve in the outdoor unit will be in the heat mode. If there is a C on the thermostat you will need to put the black wire there on some Trane models.

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I am installing a 240v heater in my downstairs bathroom. The heater schematic has a single BLACK 240v live input wire and a WHITE 240v neutral output wire, plus a yellow/green stripe ground wire. I have...


you dont need all that wht is 120vt blk is 120vt thats your 240 their is no neatral on 240 volt ont a 120 volt circuit it sounds like it is wired correctly you may have a wire not getting good conection

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RTH221 honeywell thermostat install, hooked up blue wire from old thermo that hooked to C to o/b connection on new thermostat no work did I screw something up as old thermo will not work as well now. was...


Hi,
maybe a blown fuse if it has one... if not then you blew the transformer...
Check on the circuit board in the furnace or air handler for a fuse...
if there isn't one... then you will need to replace the 24v transformer... they blow very easily...

heatman101

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With the jumper inplace does the compressor start? What about without? Unless you have more than one transformer you should leavethe jumper.

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Thermostat wiring


your best bet and where i would start is to identify where the coulors are conected at the fernace. in the industry we use standard wireing coulors wher green is g for fan and red is rh=switched trans power for heating . rc=switched transformer power for cooling . now normaly there is only one transormer so you would put a jumper from rc to rh and conect the red wire from the furnace to eather of these.jumper installed. the y is your cooling witch is normaly the yellow wire. o on the stat is for a heat pump if you nead to energize reversing valve in cooling mode . w is first stage heating and this can be conected to eather brown or white youll have to check at the furnace to see witch it is . the final wire eather brown or white should be conected to c or 24v common witch you didnt say you see on the thermostat. once again
red to rc and rh
green to g
yellow to y
brown or white to w
brown or white to common or c


please post feadback hope i was of help

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1 Answer

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the normal wiring for stats is white=w=heat,red=r=24volts,green=g=fan,blue=c=common,yellow=y=cooling.
see what ties into your furnace board and match the terminals.

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