Installing Honeywell wifi thermostat - weird wiring


I am having some difficulty figuring out the correct wiring for my new wifi thermostat. Before I bring out the A/C technician, I was wondering if anyone here might be able to help? Searched other threads and did not see one that applied to my situation...

It is a Honeywell RTH65800WF, watched all of their videos and spoke with their support department and still no luck, so here it goes:

Existing Thermostat Terminals:

G - Green Wire, Y - Blue Wire (previous owner wrote a B next to Y label), W - White Wire, RH - Red Wire (with jumper to RC terminal) (previous owner appears to have highlighted the R), B - Empty, O - Empty, RC - Jumper to RH terminal

Existing AHU Terminals:

C - Blue Wire, R - Red Wire, G - Green Wire, Y/Y2 - Yellow and Gray Wires (not sure where these lead to , but I think to outside unit), O - Empty, W1 - White Wire, W2 - Empty, Y1 - Empty

New Thermostat Terminals (need to connect to): C, G, Y, W, R

So it appears the C...

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billvill61: $87 at Amazon with free shipping

firefly038: We purchased this thermostat unit for Christmas as a replacement to our battery operated themostat. I just finished installing by myself and it worked PERFECTLY!. THANK YOU for your videos!!! While your furnace is not exactly like ours (the a/c unit is also attached to the C on the furnace and there were two sets of wires attached at the furnace board -- one thick bundle of wires to the existing thermostat and another smaller bundle the other to the outside a/c) I was easily able to figure out it when watching all four of your videos and just one of Honeywell's videos. Yours actually helped me moreso because it tells exactly what to do if you don't have an existing C wire -- which we didn't -- while Honeywell's video recommended doing the manual fan substitute and creating a new jumper. :-/ Yes, your video does leave out a few steps I would have liked to have seen -- actual connecting, etc, because I'm a novice at this -- but...

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Gene Smay: In the N.E. on an oil or gas boiler, two wires only, you would remove the jumper and connect one wire to W and one to R.

CORBY ATWOOD: Plssssss help all I have is a black and white wire and there is no labelling on the wire. Where do the wires go too

Mirian Goutch: Thanks for great video. Nicely explained....

Hayden Osborne: hooked up same exact thermostat I have a heat pump. first ac was blowing hot and heat was blowing cold now only heats

travis law: what if their is no green wire

teddy moore: do you have the option to change o/b output? how does the thermostat know if it needs ti energize on cooling on on heating?

scott riney: I know this is going to sound stupid but I got mad and smashed the thermostat in my hallway I went out and picked up a new one I put the white to W the red R the blue to b the green to G and the yellow to y now when I turn on the heat the outside unit wants to run and no it's not a heat pump but when I kick it...

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In today's video we are taking a look at how easy and simple it is to install a WiFi Thermostat with or with out a C Wire. The C wire is used in many systems, because it is the one that gives constant energy to your device, in conventional non WiFi systems , its usually required a battery, but because this system requires more than just a back light that old systems can provide by a couple of batteries. This newer system need more juice to power the back light and for WiFi.

C Wire Adapter

HoneyWell Wifi Thermostat

Wifi Thermostat

Regular Thermostats


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Hi. I'm Megan Wollerton for CNET and today I'm gonna show you how to install this Honeywell Wi-Fi Smart Thermostat. I'll assume that you've already gone through your circuit breaker and turned off your AC and that you've removed your old thermostat. So these are the wires I have behind my old thermostat. This is the Y wire, this is the W, this one's the G, and this one's the RH. The thing about this Honeywell Thermostat is that it needs a C wire to operate optimally. I don't have a C wire so that's a bit of a problem for me. There are some workarounds that you can use if you have access to your HVAC unit, but unfortunately my HVAC unit is really old and doesn't actually have a terminal port. If you don't have the C wire, a really easy workaround is this power cord that Honeywell provides, but it's not ideal because it's a big power cord. There are some other ways around this without using the power cord, but you might need to get an electrician to...

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Hi, I'm trying to replace an old mercury switch 4 wire thermostat with a new wifi Honeywell rth6500wf. I do not have a "c" wire. I do not have any extra wires running through the wall to use as a "c" wire. I also do not have access to the AC unit itself to use the "g" wire as a "c" wire as suggested in the Honeywell alternate wiring videos.

I've seen online that I can take a 24v power supply, for example a replacement 24v power supply for a phone, and cut the connector off and wire those two wires to "c" and "rc" and that will work. The problem I have is I cannot find how many amps or watts the new thermostat can handle. I've found a power supply at radio shack, its 24v 1 watt. Will this work? Or is it too much power? Or not...

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First, it’s important to make sure that you really don’t have a C wire (more on that shortly). It’s also important to understand what a C wire is, so you know why it’s necessary to have one.

What is a “C” Wire?

A “C” wire is also referred to as a common wire. The common wire is the low-voltage power wire that WiFi thermostats require in order for their advanced features to work. Unfortunately, many older homes do not have a C wire installed because old thermostat model simply didn’t require one.

You see, old model thermostats were simple devices. They didn’t need a continuous power supply. But new thermostat models often have backlit displays and WiFi connectivity, which requires a steady stream of power.

Many buyers wonder if they can simply install their WiFi thermostat without C wire and still use its advanced features. You can’t –...

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I was trying to install a Honeywell

Wifi Thermostat

, but there was no C wire. I looked at the Honeywell Aquastat attached to the gas furnace, and there were two terminals labeled "Thermostat". The 2 wires (both red) attached to these terminals were attached on the other end to the W and R terminals on the old thermostat.

Since there was no C wire, I ran 2 more wires and attached one to each of the Thermostat screws on the Aquastat, and the other ends I attached to the Rc and C terminals on the WiFi thermostat. I then also attached the original 2 red wires to the R and W terminals on the WiFi thermostat. When I turned the power on, there was power (24V based on electric tester) to the thermostat and I could start programming it (time, date). However, the aquastat was "clicking" as if it was trying to start up and then stopped. It kept clicking and there was flash with each click.

I turned off the power, and now may have to call in a pro since I do not...

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Hi Guys,

I attempted to install 2 new honeywell rth8580 wifi thermostats today. There are 2 gas furnaces in the home. 1 thermostat per furnace. The old basic honeywell thermostats had the following wires going to it.

White wire to W

Yellow wire to Y

Green wire to G

Red to R

A jumper is installed across R and RC

So with the new wifi touchscreen thermostat I needed an additional wire hooked up for the common which I had a spare that was not being used (blue wire). So I hooked the blue wire to C on thermostat and connected the other end of the blue wire ( at the furnace) to C.
Everything worked fine on the one unit downstairs. Upstairs unit gave me a problem though. After I made my connections I turned the breaker back on. The unit lit up like it was booting up but when the thermostat called for heat, the unit would click and go blank, then come back on a couple seconds later, and the same. I then put the old...

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This instructional video is about how to install this Honeywell Wifi model : RTH9580 Thermostat This smart thermostat needs a C wire which means it needs this wire to supply the thermostat with 24V power to run it, No batteries needed for this thermostat First thing you need to check: ( before you do anything turn the power off to your heating/cooling system ) 1- Make sure your Control board has the terminal C available 2- Make sure you have extra wire that is not used running from Thermostat to Control board most setup do have and mostly blue color if not you have to install one 3- you need to connect this extra wire to C Terminal in the control board 4- Disassemble the old thermostat make sure the colors of the wires on each terminal matches the colors on the control board terminals Take a picture to make sure. 5- if the old setup has a jumper on the RC Terminal and the RH Terminal this thermostat already has one but its on its own so leave it alone. If there is no jumper on the...
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Congratulations! You’ve made the decision to upgrade to a Wi-Fi thermostat. You’ll now have smarter control over your home’s temperature, and be able to access the thermostat controls from anywhere.

But first, you need to know how to install a Honeywell wi-fi thermostat. Here’s our guide to installing the thermostat, from start to finish.

How to Install a Honeywell Wi-Fi Thermostat

The installation process involves three primary steps:

Removing the old thermostat. Connecting the new device. Setting up the thermostat’s controls.

Removing the old thermostat

Before you take any steps to dismantle the device, turn off the power to the HVAC system and the thermostat by switching off the corresponding breaker on the home’s circuit breaker panel. Now, you’re ready to begin.

Now, gently coax the thermostat’s front-facing panel off the mount, being careful to keep the wire connections intact.

Once it’s removed, you’ll see a variety...

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General Information

The Honeywell RTH6580WF Wi-Fi 7-Day Programmable Thermostat is one of the few Wi-Fi programmable thermostats that actually looks like a thermostat. While many of its competitor models such as the

Nest Learning 2nd Generation

and the


have gone for a sleek, futuristic look, the RTH6580WF retains a more conventional styling. That does not mean that it is not a state of the art wireless programmable thermostat, though, far from it.

As with most other Wi-Fi programmable thermostats, it is compatible with the vast majority of North American heating, ventilation and air conditioning systems, but it does needs a ‘C’ (or Common) wire to be able to function correctly which not all systems have. Take a look at our Installation section below for links to some very helpful videos that Honeywell have made showing some easy options for a work around when you don’t have a ‘C’ wire.

Once installed, the thermostat quickly starts to...

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When the thermostat stops working, homeowners must replace it in order to keep using their heat and air conditioning. The thermostat controls the flow of the hot or cold air and the temperature inside the house. It also tells the heat pump or air conditioner when to start and stop. Honeywell is a top name in thermostats. The company offers many different types, each with different setup and installation requirements. Before installing a Honeywell thermostat, homeowners need to know what types of thermostats are available, what tools to use, and what steps to take to perform the installation.

Non-Programmable Heat Thermostats

Heat-only thermostats only have two wires that connect to the furnace from the electrical box. Where the homeowner installs the new thermostat depends on the location of the old thermostat.

Installation of the Non-Programmable Honeywell Thermostat

First, cut power to the heater. Next, remove the old thermostat while making note of...

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I am having a nightmare of a time getting rrdtool to install. I am using a raspberry Pi 2 and have tried the steps in your instructable with both the latest version of wheezy with the adafruit tools installed and also with the occidentalis v0.2 distro. In both cases I am getting the following error when executing the easy_install python-rrdtool command above:

(pi)pi@raspberrypi ~ $ easy_install python-rrdtool

Searching for python-rrdtool


/home/pi/local/lib/python2.7/site-packages/pkg_resources/ PEP440Warning: 'python (rrdtool-1.4.7)' is being parsed as a legacy, non PEP 440, version. You may find odd behavior and sort order. In particular it will be sorted as less than 0.0. It is recommend to migrate to PEP 440 compatible versions.


Best match: python-rrdtool 1.4.7


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