How do I turn off the power to my thermostat?


First, look for a switch located on or near your furnace. Location of the switch varies, so check the sides, rear or even in the rafters if the switch is not immediately visible. The switch will look like a standard light switch and should be flipped to the “off” position.

If you are unable to reach your furnace or air handler, or if you were unable to find the power switch, go to the main fuse box or circuit breaker and open the panel door. Inside, there will be several circuit breakers that should be labeled with the locations that each breaker feeds. Turn off the breaker for your HVAC equipment. If the breakers are not labeled, you may need to test each breaker to identify the corresponding areas of your home.

In either case, we suggest you verify that power has been turned off before proceeding with installation of your...

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Hello. I"m trying to install a Nest thermostat 3rd generation on my Trane heat pump/gas furnace system. My thermostat is a Trane BAYSTAT239A. There is a heat pump kit mounted next to my furnace model … read more

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I live in Tampa FL and I had a Nest thermostat installed with solar panels I purchased this summer. I have a Lennox EL180UH090E48B heating system and a It works great with the AC, but … read more

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OB Terminal on Nest Thermostat has gone out twice in the last month. … read more


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installing new nest thermostat, my old has the red wire connected to the r and jumpered to the rc. the nest has a rc and rh connector, what do i connect the...

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Code Error 53 is "defective outdoor sensor" error.
source: search engine keywords - Code Error 53

I am not familiar with this particular thermostat; however, here's some general t-stat information; I hope this solution will help you troubleshoot.

I'm under the impression that you're dealing w/ a digital thermostat
the two types of thermostats that i can imagine are programmable and non-programmable.

(MYbackground: Like removing the battery to reset the bios of a motherboard within a PC... This is a very similar approach; note: i am not a ACtech, however, familiar computers and building them.)

Multiple Thermostats set in 1 zone will conflict; the one with the lowest setting will be the determining Thermostat for the group. Here's an option you can try yourself; my solution is 'hard reset' the thermostat - afterwards, i'm outta options. invest in external thermometer battery/natural types; & manually turn t-stat ON or OFF; Additionally, keep an...

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As others have stated, your are hearing the click of relay(s). Older thermostats like the Honeywell T87 ( Redirect Notice ) utilized a Mercury bulb to operate the heating / cooling equipment, so operation was silent. With newer technology utilizing electronics, you are hearing the relay, which is basically an electrically powered switch ( Relay - Wikipedia )A very low control voltage on the thermostat powers the coil side of the relay, and the load side of the relay makes / breaks your HVAC control voltage (typically 24 Volta AC) for various devices such as fans, compressors, has valves, pumps. Depending which season you are in (heating or cooling) and the configuration, you may hear several clicks. For example when a call for cooling is made, one relay controls the compressor while the other one controls the indoor fan. Some thermostats run the fan for a short period after the compressor stops for energy efficiency. Due to this, when a call for cooling ends, you may hear a click...

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I’ve been slowly turning my home into a “smart home.” I want to be able to control my heating/cooling/lighting/electrical systems from anywhere in the world with my tablet or smartphone, just like some space-aged-homeowner-as-imagined-by-1950s-futurists would.

Today I’m replacing my old thermostat with a Honeywell Lyric thermostat that connects to the web. With the new device, I can change the temp in my house from my phone and I’ll get updates when I need to replace the filter. My dream of becoming George Jetson will be one step closer!

I’ll admit, replacing a thermostat — with all the wires and the breakers and the electric doo-hickeys — kind of intimidated a DIY-noob like myself. I didn’t want to make some wrong connection on the new thermostat and blow up my furnace. But after a bit of research, I discovered that replacing a thermostat is pretty stinking easy.

In case any of you ever find yourself needing to replace an old thermostat, I’ve...

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A thermostat is a device that is used to control a heating or cooling system so that it maintains a certain temperature or keeps the temperature within a certain range. In a home, for example, this device can automatically turn on the heating system when the temperature in the home drops or turn on the air conditioning when it gets too hot. As the warm or cool air fills the room and the desired temperature is achieved, the device then turns off the system. There are two main types of thermostats: mechanical and digital. Many digital thermostats also are programmable, which allows a user to set different preferred temperatures for different times of the day or days of the week.

Mechanical Thermostats

A mechanical thermostat uses physical means to gauge the air temperature and activate a switch that turns on a heating or cooling system on turns it off. There are several types of sensor technology that can be used in mechanical thermostats, such as bimetallic strips,...

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With the holiday season in full swing, I'm certain many of our readers will be receiving some awesome tech gifts from loved ones. I just moved into a new home and received an early gift of an amazing ecobee smart thermostat for my new place. Although in my last home the installation was as easy as swapping some wires from the old system to the new ecobee, my new home wasn't as kind to us. But with a bout of googling and posting to HVAC support forums, we persevered and are enjoying the features of a connected thermostat!

Here's how you can set up your ecobee thermostat if installation isn't exactly going smoothly.

How to install your ecobee thermostat

We've briefly detailed how to go about the installation before. If everything goes as expected, here are the steps in short form:

Power off the breakers for the HVAC system (heating, ventilation, and air conditioning).

Remove the cover of the old thermostat.

Prior to unscrewing anything,...
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Wireless Setup

Your setup process varies depending on what kind of computer or mobile device you use, but don't worry--we offer detailed instructions for every type of equipment on our Setup Guide page.

Do you have an iOS device, such as an iPad, iPhone, or iPod touch? If so, use it! It's the quickest, most seamless way to connect your thermostat to the Internet.

Still have questions? We have answers and some tips for troubleshooting.

Back to TopI'm done installing my thermostat, and I'd like to control it remotely using the web and mobile devices. What should I do next?

Go to and sign up for an account. When prompted, choose the method of setup that's right for you based on your equipment.

If you have an iOS device such an iPad, iPhone, or iPod touch, we strongly recommend you install your thermostat using the iOS app. It's the quickest and easiest way to go.

If you don't have an iOS device, choose...

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The geofencing feature is location-based scheduling which can intelligently override the time-based schedule of your thermostat. If your schedule varies or you regularly depart and return at different times, the Lyric Thermostat can automatically adjust to your life. Geofencing brings you comfort when you’re home and savings when you’re away.

When you enable the Lyric geofence schedule, it intelligently overrides your

fixed program schedule based on whether you are home or away.

• Active geofence schedule is indicated by the "geofence" logo in the top left corner of the screen. Home/Away status is indicated by the "house" logo and "away" logo.

• To learn more about configuring the geofence schedule, see the geofence menu in your Lyric App.

• Geofencing can only be configured using your Lyric App.

• To learn more about how smart geofencing can work for you and how it fits to your busy lifestyle, go to...

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Your thermostat is the control center for your HVAC system. Programmable thermostats feature easy-to-read screens that allow you to program your heating and cooling settings and view the current temperature in your home. However, if that screen goes blank, you can’t do any of this. Honeywell and other brands of programmable thermostats typically show a blank screen when there is no power going to the wall unit.

Change the Batteries

A Honeywell thermostat will flash a low battery signal for about one to two months before the batteries in the wall unit run out completely. If you’ve been away or haven’t noticed this warning and the batteries can no longer provide power to the screen, it will go blank. This is easily fixed by removing the cover on the wall unit and replacing the batteries. You may have to reset the unit and reprogram your settings once the display returns.

Power Disruption

If your thermostat is wired directly into your home’s electrical...

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Before you assume your furnace or A/C is malfunctioning, try these simple steps to make sure it isn't a problem with your thermostat. Thermostats are simply a switch; they turn the furnace on and off. The only big difference from a light switch is that they have a mechanism that measures the temperature and when it reaches a predetermined point, it activates.

If you turned on the thermostat and the heater (or A/C) didn't come on, it may be a problem with the thermostat and not the furnace. First things first, make sure that all the settings on the thermostat are as they should be. Make sure the "ON" switch is on, make sure it is set to "HEAT" or "AC" as appropriate, make sure there are no programming overrides. I've turned up the heat and had nothing happen because I failed to notice that someone turned it to "AC".

If your thermostat is battery operated, try installing a fresh battery. Even if the display is lit, a weak battery may be a culprit.

If the...

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