honeywell thermostat lcd display not working quotation

A thermostat is a vital piece of HVAC equipment. These machines allow us to easily change the temperature in our home or business, leading to sustained comfort. While there are many different types of thermostats out there, a Honeywell thermostat is among the most popular.

As these devices do an exceptional job at keeping us comfortable, problems do happen from time to time. In this post, we’ll talk about some of the most common Honeywellthermostat problems, including some troubleshooting tips.

Is your Honeywell thermostat not working at all? This can be a frustrating problem to deal with. Luckily, you can take some easy steps to try to fix the issue.

First, if you have an analog Honeywell thermostat, you can test the settings to ensure it’s set up correctly. When looking at your thermostat, you’ll notice there is one switch for heat, cool, and off; and there is a second switch for powering the fan. To try and solve the problem, turn on the heat setting and crank the temperature up to see if the system does anything. If it does power on, you’re in luck.

Now it’s time to test your air conditioning. Change your thermostat to the cool setting and turn the fan to auto. Then, turn the temperature down and wait a few seconds. If you hear the system working, you’re good to go! If not, there could be another issue going on.

If your thermostat isn’t working at all, there could be a problem internally. You could examine the inside of the thermostat to see if there is an issue. First, head over to your electrical breaker box and turn off the power source to your thermostat. Next, turn the thermostat off and carefully remove the top cover of the unit. Look at the wiring and check if anything is loose, broken, or disconnected. Also, check to see if everything is clean.

If the inside of your thermostat is filthy or there is loose wiring, that could be your problem. If you don’t find any issues under the cover, there could be something going on with your HVAC system, or you could be due for a thermostat replacement.

Another common problem is a display screen that appears blank when everything is powered on. Luckily, there are a fewHoneywell thermostat troubleshootingtips that can help.

If your digital thermostat doesn’t display anything at all, leaving you with a blank screen, you could have dead batteries. Replace your batteries to see if that helps.

It"s also possible that you have a tripped circuit breaker. This can also cause your thermostat to display a blank screen. As HVAC units tend to have their own circuit breaker, be sure to examine this to make sure the switch is set to the right position.

Is your thermostat not maintaining heat in the home? Or does your thermostat not turn on heat at all? In this case, check your batteries if your display screen is blank. If your display screen is working, examine your wiring to see if there are any issues.

Another tip is to make sure your thermostat is completely level. If it isn’t, the mercury switch in your thermostat could lead to an incorrect temperature reading. This can cause your system to continually power on and off. To try and fix the issue, make sure your thermostat is 100% level.

Is your Honeywell thermostat not cooling? Or does it seem like the temperature reading doesn’t match the actual indoor temperature? In this instance, there could be an issue with the temperature sensor. To troubleshoot the problem, grab a thermometer and measure the actual temp near your thermostat.

With how advanced Honeywell thermostats have become, trying to troubleshoot these problems can be confusing and frustrating. No matter what issue you"re having with your HVAC system or any of its equipment, calling an HVAC professional can be a very smart decision.

While it’s not dangerous to change batteries or make a small adjustment to your thermostat, working within your HVAC system and its electrical components can pose many risks. If you ever don"t feel comfortable troubleshooting your thermostat or HVAC system problems, we highly advise calling an HVAC professional. They know exactly what they’re doing and can diagnose the problem quickly.

To try and avoid thermostat problems in the future, pay attention when your thermostat is first installed. Learn how to set Honeywell thermostat, and you can maybe even ask how to solve some common thermostat problems. Additionally, there should be a manual that comes with your Honeywell thermostat, and that booklet should have a section regarding Honeywell thermostat troubleshooting. This can be a great resource when trying to solve these problems.

If you"re constantly dealing withthermostat issues, it may make sense to buy a replacement. This equipment wears down over time, and a new model may bring many advantages. In fact, as your ineffective thermostat was possibly causing poor energy efficiency, a new thermostat could bring tons of savings on your energy bills.

Your thermostat display could refuse to work if you don’t close the control door completely. If it’s not the access door, you’ll need to inspect the position of the breaker switch, inspect the thermostat configuration and check for sensor issues.

We assume that you’ve connected your thermostat to your smartphone application via WiFi and if it is still connected while the display is not working, it means that you have full control over it.

Regardless of if it’s only the display or the entire thermostat is not working, here are a few steps to apply that will definitely resolve any problems related to

When ready, make sure that the internal hardware that you’ve cleaned is DRY before you turn on the thermostat. Lastly, test and check if the display will turn on.

Once you turn on the thermostat the display should light up and provide you with visuals of the initial setup configuration. If not, continue with the next step.

It is possible that the mercury switch is not reading the temperature you applied correctly. This can cause your system to power offandonover and over again.

In most cases, these symptoms are related to the temperature sensorfault, which will definitely prevent the display controls or disable the visual entirely.

If both values do not align perfectly (there should be 1-2 degrees alloweness) then you’ve got a sensor issue, which is not that expensive to be replaced.

Next, we’ll review cases in which people report that they cannot adjust the brightness of their display which if lowered to the minimum can make the impression of a non-working display.

Turn OFF your thermostat, then locate the circuit breaker responsible for the HVAC system and turn it OFF as well. Wait for about 1 minute and put it back ON.

Once you’re done with these steps, restart your thermostat and check if the display will work. If it doesn’t, well, your display might just be broken, and you’ll need a replacement.

To fix a non-working display on the Honeywell thermostat, first, try to increase the brightness. Then change the batteries to perform a reset and make sure that the circuit breaker switch is flipped ON.

If however, the problem is still there and you don’t think that you’ll need repair service, you can contact Honeywell customer service for another round of troubleshooting.

Kevin has over five years of experience working in various Tech startups and providing Technical solutions. He has contributed to many Tech publications and websites.

If you’re searching for, “reset Honeywell thermostat,” you’re in the right place. Our complete guide includes step-by-step instructions for resetting various thermostat models. Read on to learn more.

Most of the time, your Honeywell thermostat hangs quietly on the wall doing its job of keeping your home comfortable. The only interaction you may have with it is to adjust the setting up or down a few degrees.

Sometimes though, adjusting the setting doesn’t seem to help. If no matter how much you adjust the thermostat, you can’t get comfortable, you may need to reset it.

Below we’ll show you how to reset your Honeywell thermostat. In fact, we’ve dug through the manuals of the most popular models so you don’t have to. Read on to learn more.

There are several ways you may want to rest your thermostat, depending on its capabilities and the problem you’re trying to remedy. Here arethe types of resets you may want to do:

Model-Specific Resetting.Depending on the kind of Honeywell thermostat you have, you will use a different technique to reset it. Identify the thermostat model by looking at the front of the unit or checking the manual that came with it.

Caution: Some of these thermostats are connected directly to household electric current. If you can’t identify the model or aren’t knowledgeable about working with household wiring, call an HVAC pro before doing any work that would expose you to the wiring.

You can reset the Wi-Fi network on T5, T5+, and T6 thermostats from your phone or tablet using the Honeywell app. However, it’s easier to do from the thermostat.

You’ll need to be at your thermostat even if you use your phone or tablet and the app. That’s because you’ll have to get the four-digit PIN displayed on the thermostat during the process and enter it into the app.

If you’ve tried to reset your Honeywell thermostat but it’s still not working, you likely have a bad unit. Or, something else is going on with your HVAC unit. In this case, it’s best to call a pro.

They have the tools, experience, and training to recognize when the problem is bigger than just a thermostat. Fortunately for you, we make it easy to find a local HVAC contractor.

There are several ways you may want to rest your thermostat, depending on its capabilities and the problem you’re trying to remedy. Here are the types of resets you may want to do:

Model-Specific Resetting.Depending on the kind of Honeywell thermostat you have, you will use a different technique to reset it. Identify the thermostat model by looking at the front of the unit or checking the manual that came with it.

To manually reset a thermostat, first turn off your thermostat using the power control switch. Then, turn off the breaker on your electrical panel. Wait about a minute, and then turn both back on. This should give the system time to reset. If this does not work, you might have a faulty thermostat.

If your Honeywell thermostat is malfunctioning, it"s likely not holding the desired temperature. The batteries could be low if the screen is flashing or the buttons don"t work. If the screen looks fine, you might have a bad temperature sensor, at which point it"s best to replace the entire thermostat.

To reset the battery on a Honeywell thermostat, first ensure that the thermostat is turned off. Then, open the battery door and take out the batteries. Put them back in as indicated on the back. Then, let the thermostat sit for about a minute to give it time to reset.

The "hold" button on a Honeywell thermostat locks the temperature to the desired setting (or in some cases the current temperature) until you press the "run" button, which will return the thermostat to its programmed schedule.

If the resetting doesn’t fix the problem, or you don’t want to use one of the methods that could expose you to electricity, you can find an authorized repair shop by calling Honeywell Home support at 855-733-5465.

However, once you’ve identified which thermostat you have, the resetting process is not that complicated. And resetting will often help your thermostat return to quietly doing its job of keeping you comfortable.

The thermostat is a crucial part of your home’s HVAC system: you can’t control your air conditioning and heating without it! So if you go to your digital thermostat one day to turn on the AC or change its programming only to discover that the display screen showing a total blank, you’ll have a problem on your hands.

In some cases, you can fix the blank screen problem on your own; we’ll look at some of those situations. But there are others in which you will need the assistance of HVAC professionals experienced with working on thermostats. Sometimes, the best course is simply to have the whole unit replaced with a more advanced thermostat. (There are some great options with numerous features available today. Ask your technician about them.)

The first possibility to look into when you find a blank thermostat screen is to check if the unit needs to have its batteries changed. Not all thermostats use batteries; many are wired into the electrical system of the house. If you have a unit that uses battery power, remove the front plate from the wall plate and change the batteries to see if this brings the thermostat back to life again.

If the thermostat runs from the house’s electrical system, check on the circuit breakers. One of them might have tripped and cut off the power the thermostat. Reset the breaker. If this doesn’t work, then the issue with the thermostat could come from loose connections or other wiring problems. You cannot attempt to fix this yourself, so get in touch with an HVAC professional to come have a look at it. If the technician cannot locate a wiring issue at fault or find if trouble with the air conditioner or heater has trigged the power loss, then the best course of action is to have the thermostat replaced.

Call Mid-State Air Conditioning and Heating in Nashville, TN if you need help with your home’s thermostat. We offer repairs and replacements, including the advanced Nest Thermostat, and can handle any other air conditioning work you may need.

Based on my experience and research, I decided to compile a list of common go-to fixes that you should try if you find that your Honeywell Device is not working as it should.

So, how do you fix the no-display issue on your Honeywell Thermostat even after you have replaced the batteries? First, check the power, wiring, and reset the thermostat.

Re-insert the batteries in the correct orientation; once you have inserted them successfully, your thermostat should start displaying information after a brief pause.

Keep in mind that while sometimes the thermostat issues can be fixed, in other cases, you may want to consider replacing your thermostat or perhaps upgrading to a newer version.

Ensure proper maintenance of the device, as Honeywell’s Limited Warranty does not cover products that have been damaged due to negligence, such as failure to follow a regular cleaning schedule.

The average cost to replace a thermostat in a home is $140 to $350, including the unit and professional installation. Thermostat prices range from $15 to $250, depending on the type, brand, and features. Nest thermostat installation costs $100 to $200 for labor if the unit is provided.

DIY installation is possible is you have basic electrical knowledge. Otherwise, electricians charge $40 to $100 per hour for a home thermostat replacement, which takes 30 minutes to 3 hours on average.

An improper DIY installation runs the risk of blowing out the new thermostat, HVAC unit, or circuit breaker, or suffering an electric shock. Get free quotes from thermostat installers near you, or compare prices and types of units below.

Thermostat prices range from $15 for a basic mechanical unit, up to $320 for a smart self-learning unit that saves energy. Costs depend on the type, brand, and amount of features included. Professional installation adds $80 to $200 to your total cost.

The average cost of installing a smart thermostat is $225 to $400, depending on the brand, model, features, and if the wiring needs updating. Without installation, the cost of a smart thermostat unit ranges from $100 to $250.

Smart thermostats like Nest automatically learn your preferences over time and optimize the energy used to save money. Plus, you can connect to the thermostat remotely over Wi-Fi to adjust temperatures or program a heating and cooling schedule.

A Wi-Fi thermostat costs $70 to $200 for the unit and between $100 to $200 for professional installation. A Wi-Fi or Bluetooth-controlled thermostat allows for remote access, but doesn"t learn like a smart unit over time. Popular brands include Lennox, iComfort, and Honeywell.

The average cost to install a programmable is $200 to $300, depending on the type and features. A digital programmable thermostat costs $80 to $140 for the unit only. The more expensive ones may include a touchscreen, vacation override, keyboard lock, and programmable scheduling.

The average electronic thermostat costs $20 to $50 for just the unit, with installation labor adding $80 to $150 to that amount. These use an electronic temperature sensor to open or break the electric circuit to the heating or cooling system.

A manual thermostat costs $15 to $40, and the labor cost to install ranges from $65 to $150 unless you DIY. Mechanical or manual units are being phased out since some contain small levels of mercury and have minimal features. About 80% of the mechanical thermostats are heat-only types.

Thermostat installation costs depend on the cost of the unit, labor, running new thermostat wire, replacing the housing, moving a thermostat, installing a central hub, additional remotes, or hooking it up to a multi-zone system.

Replacing a thermostat with a similar unit is quick and easy as the wiring is the same, but if you’re replacing an old analog unit with a smart unit, additional costs for working with drywall or adding new wiring may apply.

The average labor cost for a thermostat replacement is $80 to $200, depending on the amount of time the install takes and if it"s a basic or smart thermostat. HVAC service costs $50 to $150 per hour to install a new thermostat, which takes 30 minutes to 3 hours on average.

Contractors may offer discounts for installing multiple thermostats at once, such as if you have a multi-zone HVAC system with electronic dampers or baffles. Multi-zoned systems save on enery costs and have remote sensors to set the temperature in each zone the HVAC system controls.

The average cost to run a new thermostat C-wire is $90 to $135, depending on the access points and placement of existing wire. Installing a C-wire is required in older homes when upgrading to a thermostat that uses continuous power to run the display and Wi-Fi connection.

Repair, replacement, and connection of existing thermostat wiring costs $60 to $200 for complex jobs over a longer distance. Some furnaces must be wired to the thermostat while others have sensors added.

The average cost to move a thermostat is $135 to $450, depending on the distance. Drywall repair costs $75 to $150 to patch the old hole and cut a new one, while wiring installation runs $6 to $10 per foot.

Moving a thermostat to a temperature-stable area saves on energy bills since the HVAC won’t be triggered to start unnecessarily. Move the unit out of the sun, away from drafts, electronics, or dead air space. HVAC professionals recommend moving it near a return-air duct to measure the temperature accurately.

Smart hubs or remote systems cost $70 to $230 on average and can control temperature, lighting, security, and appliances all from one app. Remote hubs for thermostats require a C-wire (common wire) to give continuous power.

Prices for buying a new thermostat also vary by brand and the unit"s features. Most popular thermostats can be purchased from local home improvement stores, or online via Amazon. Here are the costs of top-rated thermostats by type.

The average Nest thermostat installation costs $100 to $200 for labor-only if you provide the thermostat unit. Installation takes 30 to 60 minutes, depending on if you’re also setting up the Nest hub.

The average Hive thermostat installation costs $100 to $200 for labor-only if you provide the thermostat unit. Installation takes less than 90 minutes, depending on if you’re also setting up the Hive hub. Hive"s smart thermostat comes with a one-year warranty and is Energy Star certified. Watch their video guide for DIY installation.

In some homes, the AC and furnace thermostats are installed seperate. The average cost to replace a furnace thermostat is $190 to $480, while replacing an AC thermostat runs $120 to $200. These individual systems apply to homes that have an alternative heating source, or only need to cool certain rooms.

A wall or floor heater thermostat replacement costs $230 to $485 on average , depending on the type and voltage. Each manufacturer typically has a list of compatible replacements and most work off low-voltage while others are plug-in.

The average refrigerator thermostat replacement costs $100 to $250 to replace. A refrigerator thermostat costs $10 to $40 for just the part. Installing a digital thermostat is preferable since it can keep the desired temperature accurate and consistent.

The thermostat needs to be replaced if there is no click when you turn it from the lowest to the highest setting or if a multimeter shows it has no continuous voltage, current, and resistance.

A hot water heater thermostat replacement costs $150 to $350 on average, depending on if it"s gas or electric and whether the heating element is replaced. Most water heaters have two thermostats and two elements that are replaced at the same time. Many technicians recommend replacing it with a programmable wireless option.

Electric – Replacing an electric water heater thermostat is an easy DIY job if you"re comfortable working with electrical wiring and are sure to turn off power to the unit.

The average cost of a new thermostat for a boiler is $279 to $479 for a complete replacement. Prices range from $159 to $279 for the unit, and $120 to $200 for the installation labor.

The average cost to replace an oven thermostat is $80 to $240. An oven thermostat has a sensor bulb and capillary tube in a mounting bracket within the control panel, and the entire thing will be replaced.

Replacing a dryer thermostat costs $150 to $300 on average, while purchasing the parts to make the repairs yourself runs $40 or less. Replacing the electronic control board, which ties to the thermostat costs $100 to $200 more. Compare this to buying a new dryer for $300 to $1,200.

If there is no heat at all or it overheats quickly and shuts off, replace the thermostat. Otherwise, if the clothes are taking ages to dry, check if your lint duct is clogged.

Upgrading to a digital, programmable, or smart thermostat with proper settings can save $180 per year on your energy bills. Using a ceiling fan for air conditioning saves $42 per season, and $5 during winter when operated in reverse.

Also, changing the house temperature by 7 to 10 degrees while sleeping saves up to 10% on your heating and cooling costs, or about $106 per year. Check the Energy Star site for possible rebates in your area when you install or upgrade your thermostat.

Energy providers in some cites offer a $25 rebate for each smart thermostat you purchase and install, and up to an $85 incentive to enroll in a voluntary power management program. The program briefly adjusts your temperature setting during peak energy demand to save money.

Smart thermostats save up to 15% on your energy bill when programmed correctly. Smart thermostats learn your temperature adjustment habits and save $180 per year by optimizing the heating and cooling cycles.

Considerations when replacing a thermostat include its disposal method, the location of the new thermostat, scheduling the replacement work, the contractor’s experience, and the amount of expected drywall damage.

Hazardous waste – Thermostats older than 2002 might contain mercury, and disposal methods must follow state laws. If you see an ampoule of silver mercury, bring it to a hazardous waste facility, HVAC supplier, or ask your contractor.

Location – Install the thermostat away from direct sunlight, heat sources, drafts, warm appliances or devices, or dead air space (behind doors or furniture), so it can accurately assess the temperature.

Renting – If a landlord pays the energy bills, ask if they will cover the installation cost. However, this means you cannot take the thermostat with you when you move.

The new thermostat must be compatible with the power requirements of the existing system. Most HVAC systems are called low-voltage systems, and they use 24V power—typically AC units, split units, boilers, furnaces, electric baseboards, and heat pumps.

Installing a thermostat to a line voltage circuit without using an adapter or rewiring can break the thermostat and even cause a fire. All thermostats turn the heating and cooling system on or off through either:

Zoned System – In addition to the stage type, separate heating and cooling zones can turn on or off based on sensors working with the same HVAC system.

You should replace your thermostat every time you replace your central air conditioner, heater, or HVAC system. Thermostats typically last 10 years before their performance starts to decline or they stop working.

Using a multimeter, check if your electrical connections are working or if it’s the thermostat that’s broken. It measures voltage, current, and resistance.

A home thermostat lasts 10 years on average. The life expectancy depends on proper maintenance like dusting the coils, adjusting the anticipator, and making sure the thermostat is level. After a decade, the thermostat’s performance often begins to decline.

Replacing a thermostat takes 30 minutes to 3 hours on average, depending on the type, accessories, and if any repairs are needed. Smart thermostats take the longest to install and require rewiring and Wi-Fi setup.

Most brands and home improvement stores have instructions and instructional videos for how to install or replace a thermostat. Check out Honeywell’s or Lowe’s how-to videos.

Disconnect wiring – Disconnect wires and take care not to let connecting wires slip back into the wall by taping them or wrapping them around a pencil. Remove old thermostat.

If the thermostat has a ground wire labeled G or C, connect it to the circuit ground wire, which is usually black but sometimes green (which could alternatively be for the blower fan).

According to a study by the National Renewable Energy Laboratory (NREL), the mean indoor temperatures homeowners set their thermostats to for the most comfort are:

When replacing an older two-wire manual thermostat, a DIY replacement is possible once the power to the house is turned off. Installing more complex systems such as a smart, digital, or Wi-Fi unit can have 10 to 12 wires to connect and requires a professional.

An improper installation runs the risk of blowing out the new thermostat or HVAC unit or suffering an electric shock. When hiring a professional, be sure to:

Heating or cooling room thermostat batteries & backujp power sources: What is the role of the battery in a room thermostat? How do we diagnose and fix a blank thermostat display?

Page top photo: a basic room thermostat showing the red and white wires being switched by the thermostat and a place where it"s easy to check for voltage at those terminals.

Some programmable digital room thermostats include an internal battery that will allow the device to remember the program that you have set even if there has been a power outage.

All programmable digital room thermostats are designed to return to a "safe" or "standard" temperature program to be sure that heat or air conditioning will continue to work in some reasonable range in case a power outage or dead internal battery causes the thermostat to forget how it was programmed by the user.

Watch out: some room thermostats require a battery to operate at all. These wall thermostats do not use power from the 24V thermostat wiring system and its low voltage transformer, and typically these thermostats will have larger batteries than those using battery power only for temporary backup.

Jeanie, the Hunter 44422 you are discussing is a Hunter Fan Company programmable thermostat. You can get product information and instructions at the company"s website www.hunterfan.com or contact the company directly at Hunter Fan

This thermostat is not designed for use with 110V/220 V systems. If you are unsure of what kind of heating and cooling system you have, please contact a qualified HVAC Technician for assistance.

The batteries in this unit, or at least the one that I examined, are in the back of the hinged, removable thermostat assembly. You"ll have to un-clip the thermostat from its top, swing it down and out on its hinge, and you"ll see that using a plug connector the entire assembly is removable to make it easier to change the batteries without breaking something.

When the batteries are weak, the CHANGE BATTERIES warning flashes until three new AA alkaline batteries are installed. If the batteries become too weak for normal operation, the thermostat enters the second battery power shortage mode.

When no battery power is left, the BATTERIES USED UP warning flashes on the display and the system turns off. The system remains off until new batteries are installed. The thermostat resumes normal operation after new batteries are installed.

Reader Question: Our digital thermostat is blank - what causes the thermostat LCD screen to go blank and refuse to respond when I press thermostat keys or controls?

When we came home from the store the digital thermostat was blank. We tried to take off the face of the thermostat to look for a battery as we were doing that the thermostat kicked on. Problem was it started to blow hot air. We went back to the thermostat and when we fiddled with it it went off but then came back on this time it blew cold air. Everything fine right?

Not so fast. In the middle of the night I woke up drenched with sweat. For some reason the AC started blowing hot air. I simply touched the thermostat and it went blank. I haven"t touched it since.

When the display on a digital thermostat goes blank that means that power has been lost to the unit. Power for a digital TT comes from one or at most two sources:

The low-voltage transformer mounted somewhere, often near the electrical panel or near the heating or cooling equipment supplies normal power to the thermostat; if one of those wires is disconnected, the transformer burned up, or power to the equipment where the transformer is mounted is turned off, the thermostat will go blank

Some thermostats also use a backup battery to remember settings when someone has turned off power or there has been a power outage. If the batteries are dead that"d be a second reason for a blank display. This is a less serious concern, as thermostats have a fall-back default program that will get things running after a power outage - which takes us back to reason #1 - power is off to the thermostat.

Next, check the thermostat setting mode and physical switches. Trane gives this advice if the display on their TCONT800 series Touch Screen programmable thermostat (illustrated at above left) is blank or not responding to touch:

If the display is not entirely blank, but does not respond to touch, check the thermostat"s Advanced Settings to see if the device was put into locked mode.

THERMOSTAT BACKUP BATTERIES at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

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All Proliphix Network Thermostats come with our free Uniphy Remote Management Service. This unique offering lets you monitor and control your HVAC systems by simply pointing your Browser to our secure Proliphix Web Site. Enjoy the convenience of programming a thermostat from any location, using a simple graphical interface. No computer equipment or software is required. And since Proliphix takes care of the network configuration for you, you’ll be up and running in no time. We’ll even proactively monitor your thermostats and send you an immediate email or SMS message when an HVAC problem is detected.

[3] Honeywell Controls, the company wants you to use their contact form at this web page: http://www51.honeywell.com/honeywell/contact-support/contact-us.html

[4] Honeywell Corporation, Honeywell T451A, T651A, T694A,B,D,F Light Duty Line Voltage Thermostats, [installation, troubleshooting manual], 1992, Honeywell Consumer Products,

"T451, T651, T694 Thermostats provide on-off control of valves, fans, motors, contactors, electric heat elements, duct furnaces and fan coil units in heating/cooling systems. Switching sub-bases provide manual control of heating, cooling and fan."

[6] Honeywell EConnect™ Wireless Thermostat Kit TL9160AR System Installation Guide, retrieved 3/15/13, copy on file as Honeywell_EConnect69-2474EFS.pdf

In addition to providing concise details of nearly 500 different boilers fuelled by electric, gas, oil and solid fuel, and over 400 programmers and time switches, this invaluable resource also features numerous easy-to-understand wiring diagrams with notes on all definitive systems. Brief component descriptions are provided, along with updated contact and website details for most major manufacturers.

[13] "Automatic Oil Burner Controls - Thermostats", Domestic and Commercial Oil Burners, 3rd Ed., Charles H. Burkhardt, McGraw Hill, 1969 (and later editions), ASIN B0000EG4Y8

I bought a Honeywell TH8320ZW thermostat to work with my Samsung SmartThings hub. After getting it turned on, the top of the screen would almost instantly say “Communication failed”. I would try to add it to the Z-wave network (just like it says in the manual) and it would do one of two things: 1) say “Adding to Network” but it would never do anything for a few minutes, or 2) almost instantly say “Action Failed”.

The problem is this: the Z-wave component of the circuit board is not properly connected to the main circuit board. The two are connected by four thin pins, and the housing is spacious enough that they easily become disconnected. To reconnect them, open the housing by peeling off the front housing (the one around the touchscreen), it should snap off, and this will expose the screen casing. There are two tabs on the sides of it to push back, then the whole thing can come loose. You can remove the main circuitboard now, and then you’ll see the Z-wave board just underneath (still in the housing). Try to now push them back together (being very careful to align it properly). You can put the thermostat back on the wall without the front casing on, and try to set it up again and see if it will connect to your Z-wave hub now. This did the trick for me.

The Honeywell RTH5160 Digital Non-Programmable Thermostat offers intuitive operation with basic button functionality. This non-programmable thermostat"s straightforward backlit display provides a seamless approach to navigating in home heating and cooling functions. Precision Temperature Control and Auto Change capabilities will provide owners an easily accessible means of pinpointing their preferred heating/cooling settings. This non-programmable thermostat includes a Change Reminder feature that will alert owners whenever a new pair of batteries is required. Temperature preferences will remain intact in the event of a power outage. This alleviates owners from the hassle of reentering their selected setting. Installation is also seamless as this non-programmable thermostat includes: UWP mounting system, mounting hardware and a quick install guide.

No more guessing at little lines in the dark. The RTH5160 Simple Display Non-Programmable Thermostat has all the features you love - straightforward readings, single-degree control, basic functions - with a backlit, easy-to-read display that shows both your temperature and set point simultaneously.

This non-programmable thermostat is all about change. Featuring auto-change from heat to cool and a change reminder alert for the 2 AA batteries (not included), you can be confident your comfort levels stay intact - even during a power outage, thanks to memory storage.

Trade just a little of your time for a DIY install project. The UWP mounting system, included mounting hardware and quick install guide can have your digital thermostat up and running quickly. Simple steps and basic wiring to your home"s comfort in your control.