Question about Honeywell Focus 6300B 5-2 Days Programmable Thermostat Heater

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I have to replace HONEYWELL CT3600A 4444N thermostat which controls heating and cooling by 3 wire connection. Which current unit will do the same?

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Posted on Jan 02, 2017

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SOURCE: Thermostat auto-changeover mode unavailable

when you programed it did you go through all the setup #1-0 ,#3-0 ,#5-5 ,#12-1

Posted on Nov 25, 2008

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SOURCE: Wiring a Honeywell VisionPRO TH8320U1008 Thermostat

the thermostat will to any temperature but will not shut off

Posted on Jan 28, 2009

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SOURCE: Replacing Round Honewell Mercury Thermostat

try to get one that is made for oil heat, the installation is easy only two wires, and the instructions make it easy.

Posted on Apr 26, 2009

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How do I wire a Honeywell thermostat


Can I start by saying I am not in anyway saying to do this alone it is dangerous but if u must follow each step start by being safe shut off the breakers good luck here to help
Step 1
Turn the air conditioning and heating unit off by flipping the appropriate circuit breaker. Test the unit to make sure it's off by turning your existing thermostat to the "On" position and seeing if it turns on. Wiring a Honeywell thermostat when the circuit breaker is on could cause you to blow the transformer that powers the HVAC unit Step 2

Connect the red wires to the thermostat RH, thermostat RC or thermostat R terminal. The thermostat RC terminal has a jumper wire between thermostat RH and thermostat RC. The thermostat R terminal operates both the heating and cooling units, and contains an internal jumper wire. Basically, your red wire on a Honeywell thermostat is the hot wire that run. Step 3

Run the green wire to the thermostat G terminal. The green wire controls the relay that operates the blower, and it controls the fan. Step 4

Control your air conditioning when you connect the yellow wire. It connects to the thermostat Y terminal Step 5

Hook the white wire to the thermostat W terminal to control the heating unit

Nov 20, 2014 | Heating & Cooling

1 Answer

I want to replace a trailer thermostat that has 3 wires to a honeywell 4 wire thermostat . The problem is that the old wire has 3 wire (1w, 2r & 3 orange) the new one calls for 4 wires but wh


If there are both an Rc and Rh terminal, there should be a jumper across the two if there is only ONE transformer supplying power to both the furnace and the a/c. Without the jumper, there is no power on the cooling side of the thermostat.

Also, the Honeywell thermostat may require a fourth wire for the C terminal. Some thermostats 'rob' control power for their operation off of the R terminal wire and others must have the physical connection to the C terminal, and yet others have batteries for the programming portion and when they go dead, there is no heat or cool operation.

Sep 09, 2014 | Honeywell Electronic Programmable...

1 Answer

I installed a new thermostat on my hvac system and the heat is not working anymore.


On that thermostat there is an R and an RC wire connection, the R is the power wire for heat and RC is the power wire for cooling. If you connected the power wire (normally red in color) to the RC only the fan control and AC control will work, there has to be a jumper wire between the R and RC terminals (assuming there is only one control transformer) for both the heat and cool functions to work.

Jan 21, 2014 | Honeywell Programmable Thermostat Heater

1 Answer

Yourhome honeywell com


To start, most tstats pull straight off of its base, or pull away from the bottom and lift from the top. Yours should be a touch screen and pulls straight out. Hopefully the installer secured the base well enough to the wall. At the tstat that has dehum. capability, see if it has a terminal marked D or H for dehum. If so, there is a wire connected. Now at the 1 you would like to replace, remove tstat from base, and check the number of wires you have available. If you don't have a "spare" wire for the new tstats' H(humidity) terminal, it won't work out because you'll need an extra wire. Also the existing tstat may have that option, but isn't configured for dehumidification. Might check that too. It is possible to add dehumidification to any and all zones depending on available wires. Also, at the geothermal, this "extra" wire needs to be connected.

Mar 10, 2017 | Heating & Cooling

1 Answer

I currently have a Honeywell T874C1000 and want to replace it with a programmable thermostat. It controls a cooling only air handling unit with an outdoor condensing unit. No heat.


All you have to do is note which wires are hooked to which terminals and exchange them i.e.-R(Red) to R terminal, Y(Yellow) to Y terminal, etc. The only wires you should need are the Red, Yellow, Green, and sometimes Blue if the thermostat is powered by the unit and not batteries. Here are the most common wiring procedures:

Red(R)=Power
White(W)=Heat
Green(G)=Fan
Yellow(Y)=Cooling
Blue(B/C)=Common/Ground

Hope this helps!

Jun 26, 2010 | Honeywell Programmable Thermostat Heater

2 Answers

Replacing WHITE-RODGERS manual thermostat with 3 wires ( red, white, blue and installing Honeywell electronic thermostat RTH110B, how do I connect it? The heating is not central, baseboard heating.


I have only seen one Honeywell thermostat that would work with a 3-wire heating system.

I would replace it with a White-Rodgers 1F80-0471. They are about $100, but they are a good thermostat, and they work well with the 3-wire zone valves.

Most other thermostats have the "Y" terminal that you need, but do not control the zone valve correctly.

Helping Hands Services
- Fairbanks, Alaska -

Jan 30, 2010 | Honeywell Electronic Programmable...

2 Answers

Honeywell RTH230B works on AC not on Heat


check wiring to furnace check wire hook ups on board match letters and colors sometimes installer use what ever wiring they chose on letters

Oct 16, 2009 | Honeywell Electronic Programmable...

2 Answers

Lennox G40UH(x) series - Air not coming on


electrical connections @ the furnace may the thermostat .Tom

Jun 18, 2009 | Heating & Cooling

1 Answer

Honeywell Thermostat


Make sure G from indoor unit goes to G on thermostat for fan continous fan, if that doesn't work and you have 24 volts to R and C then the t'stat is bad.
For 2nd stage heat or aux.heat, on the indoor unit you need to make sure the wire W2 from the indoor unit goes to W2 on t'stat.
You don't need any wires from W1on the indoor unit to W1 at the t'stat because with a York heat pump Y1 is the contactor which turns the compressor on and you will get 1st stage heat, and for cooling the t'stat will also bring on O which is the (reversing valve) or cooling changeover relay for the cooling mode.
C = common usually black wire
R = hot usually red wire
Y or Y1 = contactor
W1 = 1st stage heat not needed for heat pump
W2 = Aux. heat indoor heat
G = fan
O = Cooling changeover relay
B = Heating changeover relay
L = System monitor
E = Emergency heat relay

Dec 23, 2008 | Honeywell Electronic Programmable...

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